Monday, January 27, 2020
Human Activities Global Warming And Climate Change Environmental Sciences Essay
Human Activities Global Warming And Climate Change Environmental Sciences Essay Climate change is a long-term change in the Earths climate, or of region on the Earth (Nasa.gov, 1975). Humans use energy in their daily life such as driving cars from one place to another place. However, most of their activities effect the environment. According to Nap.edu (1996), it states that global stability is threated by the human activities. This is because human activities emit amounts of carbon dioxide.Furthermore, Newscientiest.com (2007) also states that based on IPCC report (2001), 90% of the causes of climate change are from the human activities. Besides that, Nasa.gov (1975) also states global warming is the changes in the Earths average surface temperature due to ascending levels of greenhouse gases. Human activities such as deforestation, open burning and emission of greenhouse gases through transportation have become the largest contributors to global warming. So, there is a relationship between the human activities, global warming and climate change. This is becaus e human activities emit excess carbon dioxides that lead to carbon pollution and thus cause global warming and climate change. Nrdc.org (2012) states that the carbon pollution is the main cause of the Earth are getting warmer, increase the frequency of drought, and flood. Since the average temperature increases rapidly, human and other living things will face the consequences such as the melting of glacier, acid rain and the rising of sea level too. Hence, human activities such as deforestation, emission of greenhouse gases from transportation and open burning are the main causes of the global warming and thus climate change. In terms of deforestation, Climateandweather.net (2010) states that deforestation is causing the necessary function of trees to be lessened and affect the climate. It also states that forests store carbon dioxide, produce oxygen, control the climate, and purify our water and air. So, that means forests are vital for our life. However, there are reasons that cause deforestation to happen such as illegal logging operation and agriculture.Wwf.panda.org (2011) mentions that the logging activity keeps happen in violation of national laws.Most of the illegal loggings happen because of the ascending demand for papers and timbers. Therefore, the operation keeps continuing without permission from the government. Besides that, illegal loggings also include activities such as harvesting wood from restricted areas and exporting exotic species of trees. In terms of agriculture, Wwf.panda.org (2011) states that illegal logging can also occur when the forests are cleared for a plantation such as oi l palm or rubber plant. Even the plants also absorb the carbon dioxide as same as the forest, the plant need more times to grow up and able to absorb more carbon dioxide like forest do.Climateandweather.net (2010) mentions that most of agricultural crop and other smaller plants also draw in carbon and release amounts of oxygen, but the forests able to store up to 100 times more carbon dioxide than other plants. So, it emphasized that the forests are very important to stabilize the global warming. Besides that, water is also needed to reduce the excess carbon dioxide in the air. Since the forest is a place where the water is purified, the water can also help to reduce the carbon dioxide. The rainforest and sea play a big role in this aspect. According to Worldwatch.org (2012), it states the oceans are by far the largest carbon dioxide sink in the Earth. However, since deforestation keeps happening, even the sea becomes limited to sink all the carbon dioxides. Loss amounts of trees in crease the amounts of carbon dioxides at the atmosphere lead to global warming and thus climate change. Moreover, another factor of climate change is the emission of greenhouse gases from the vehicles on the road. Transportation produce energy from the burning of fossil fuels and change into motion. Only this way can makes them enable to move from one place to another place. Greenhouse gases such as carbon dioxide are the most emitted gas from on-road vehicles. Epa.gov (2010) mentions transportation that use fossil fuels is the main source of carbon dioxide emission. There are many transportation sources for instance air travel, marine transportation and highway vehicles. Most of the vehicles use gasoline and diesel in order to transport good or people. G.Roger (2012) states excessive vehicles usage causes the transportation emission increases and leads to global warming. This is because uncontrollable greenhouse gases from the transportation will lead other heat-trapping gases and carbon dioxide gas to the atmosphere. So, there will be more and more excesses carbon dioxide will be pro duce and emit to the atmosphere. This matter will lead global warming and thus climate change since the global average temperature keeps increasing. Furthermore, based on Broadus (2012) states those greenhouse gases emissions are leading to sea level rises and thus floods in various places. Streams, rivers and reservoirs are not able to support and store excesses water since the sea level increase rapidly. Even the dams unable to stop the flowing water to entered the protected places. These problems lead floods to occur in various places especially in the cities and villages nearby the beach or rivers. Besides that, monsoon rains in certain places like Mumbai will be another problem to this matter. Broadus (2012) also mentions about heavier monsoon rains will make the floods worse. Thus, excesses transportation emission will lead to the dangerous change on climate change such as increasing the sea level and affect the monsoon circulation. Another catalyst of global warming and climate change is open burning in various places. It is an activity that produces really large amounts of carbon dioxide which change the Earths temperature and cause the melting of glaciers due to the global warming. This is because open burning release heat from the combustion that enhances the warming in the atmosphere. The open burning not only releases carbon dioxide, but also black carbon which is the second global warming agents after carbon dioxide. According to Kanittha and Savitri (2012) mentions in their research that warming effect from black carbon will be increase as it mixed with other particles in the air such as carbon dioxide. They also mention black carbon enable to enhance the melting of snow or glacier three times that of carbon dioxide. As the carbon dioxide also emitted together with black carbon, the affect must be fatal and more dangerous on global warming and climate change. Human activity such as open burning of agricu ltural residues after harvesting is the main source that leads black carbon and carbon dioxide emission to the atmosphere. Kanittha and Savitri (2012) also state the combustion of the crop waste is the significant source that release black carbon and other greenhouse gases. So, the production of carbon dioxide and black carbon trap tremendous amount of heat and raise the Earths temperature causing severe impact on the Arctic. As the global getting warmer, the melting of glaciers continues to occur in high speed which is also leads to increase the sea level. This unstoppable problem worries the whole nations in the world as they lost habitats and their life is in danger as the land become limited and covered by the water. Other living things such as animals and trees also are facing the same problems as they lost their habitats and most of exotic species become extinct. Therefore, open burning also has negative impacts to both of the environment and people. The climate is a major part of the Earths environmental system and cannot be replaced by human. According to the Intergovernmental Panel on Climate Change (2007) states there are many ways to mitigate the global warming and climate change. However, the main key of the solution is the cooperation and unity from the people so they enable to make a different in order to reduce the carbon pollution and global average temperature. One of the solutions is to follow the regulation provided by the government such as prevent the illegal logging operations or deforestation. This method enables the trees using up the carbon dioxide from the atmosphere. The water is also able to use the carbon dioxide with sinking the carbon dioxide. Since it becomes limited, people need to reduce carbon dioxide more. Besides that, carpooling and limit the transportation usages on the road are also helps to reduce the amount of carbon dioxide in the atmosphere. This is because the small amount of vehicles usage will lessen the emission of greenhouse gases especially carbon dioxide. People also can develop and use other alternative or renewable energy to replace fossil fuel such as solar energy. Tom (2012) mentions transportation that powered by solar electricity emit about less or zero percent of carbon dioxide is the most efficient way to reduce large amounts carbon dioxide. However, continuous researches and new environment-friendly technology need to conduct by human in order more alternatives can be used. Moreover, people also need to decrease their open burning activities. They can try recycling any reusable material or things in order to prevent the open burning. So, there are more and more carbon dioxide will be cut off. Hence, people need to try any ways to reduce deforestation, carbon dioxide emission from transportation and open burning in order to decrease global average temperature or global warming and climate change. Otherwise, the global warming will continue to affect the c limate change, and thus people, animals, and environment will have the difficult time to face the consequences.
Sunday, January 19, 2020
Negotiation Techniques and Third-Party Intervention
Some of the techniques that can be used to lessen a person’s reluctance in order to avoid the need for a third party to intervene and manage negotiations are: not negotiating or postponing negotiations until there is an indication that there is something to gain that may not be possible to be gained through other alternatives. Reluctance is at times considered reversed psychology and it is recommended not to fall victim of this trap, one must prepare well and take comfort, and not appear to be anxious in the face of your counterpart.These techniques are consistent with the negotiation process in the sense that if the other person’s attitude does not change to coincide with yours, negotiations should be terminated, by simply refusing to negotiate in the style dictated by the other side. Negotiations can be terminated completely or postponed, with the condition that your requirements regarding approach or process will be met. Using these techniques and knowing your altern atives during the negotiation process can pay off big.Considering the event of this situation, I would let the other company know of my concerns regarding the tone, and attitude of reluctance from a member of their team. If the matter if not corrected within reasonable time, I would postpone negotiations for a later date (if time permits) while also designating the location for the meeting and provide the conditions regarding the current issues.If by then the person’s attitude still does not coincide with mine, I will analyze how important achieving this goal is and if there are any other alternatives to gain the desired results. Depending on the outcome of the analysis I can then decide to accept the changes without involving a third party or refuse to negotiate until requirements are met. If the attitude of reluctance changes to a more cooperative attitude, negotiations can proceed, while still maintaining a close eye on the person that was previously reluctant. There is a high possibility that the person, who earlier displayed an unacceptable attitude, can now view the situation as a contest.Therefore, one must have to control responses to the various intimidating and manipulative tactics that may be used against you. In such case, a concentrated effort should be made to use counter tactics designed to emphasize that you have what the company needs . Lastly, it should be confirmed at the outset that the goal is for a complete agreement and that each issue or solution is tentative until the entire matter is addressed and agreed upon. This will provide all parties the flexibility to find solutions and trade-offs at the end of negotiations. It also protects parties from unscrupulous tactics by the other side . Regardless of the outcome, one must always know when and how to control the negotiation process to avoid the involvement of third parties.
Saturday, January 11, 2020
Diagrid
DIAGRID : THE LANGUAGE OF MODERN DAY BUILDER ABSTRACT Design and construction of artificial infrastructure on the lines of  biomimicking principles requires the development of highly advanced structural systems which has the qualities of aesthetic expression, structural efficiency and most importantly geometric versatility. Diagrids, the latest mutation of tubular structures, have an optimum combination of the above qualities. In this paper, the peculiarities of the Diagrid, its structural behavior under loading and the design and construction of diagrid nodes are described.A case study of some recent diagrid tall buildings, namely the Swiss Re Building in London, the Hearst Tower in New York, and the West Guangzhou Tower in china is also presented. CONTENTS 1. INTRODUCTION 2. THE TRIANGULAR DIAGRID MODULE 2. 1         INTRODUCTION 2. 2          MODULE GEOMETRY 3. STRUCTURAL   ACTION OF A DIAGRID MODULE 3. 1       EFFECT OF GRAVITY LOADING 3. 2       EFFECT OF LATERAL LOADING 3. 3       EFFECT OF SHEAR LOADING 3. 4       EFFECT OF NON-APEX LOADING 3. 5 EFFECT OF HORIZONTAL AND VERTICAL CURVATURE UNDER VERTICAL LOADING 3.       EFFECT OF HORIZONTAL CURVATURE UNDER HORIZONTAL LOADING 4. DESIGN AND CONSTRUCTION OF DIAGRID NODES 4. 1                MATERIALS  USED FOR DIAGRIDS 4. 2                 DIAGRID NODE DESIGN 4. 3                NODE CONSTRUCTION FOR DIAGRID STRUCTURES 4. 4                ERECTION OF DIAGRID NODES 5. CASE STUDIES 5. 1           SWISS RE BUILDING 5. 2          HEARST TOWER 5. 3Â Â Â Â Â Â Â à ‚   GUANGZHOU WEST TOWER 6. MERITS AND DEMERITS OF DIAGRIDS 6. 1    MERITS OF DIAGRIDS 6. 2                DEMERITS OF DIAGRIDS               7. CONCLUSION CHAPTER-1 INTRODUCTIONThe Diagrids are perimeter structural configurations characterized by a narrow grid of diagonal members which are involved both in gravity and in lateral load resistance. Diagonalized applications of structural steel members for providing efficient solutions both in terms of strength and stiffness are not new ,however nowadays a renewed interest in and a widespread application of diagrid is registered with reference to large span and high rise buildings, particularly when they are characterized by complex geometries and curved shapes, sometimes by completely free forms.Compared to conventional orthogonal structures for tall buildings such as framed tubes, diagrid structures carry lateral wind loads much more efficiently by their diagonal members’ axial action. ;               Among the large-span buildings some examples are represented by the Seatlle Library, the London City Hall, the One Shelley Street in Sydney, and more recently by several outstanding Pavilions realized at the Shanghai 2010 Expo, (e. g. France, UAE) as well as by some dazzling projects like the Astana National library.Among tall buildings, noteworthy examples are the Swiss Re building in London, the Hearst tower in New York, the CCTV headquarters building in Beijing, the Mode Gakuen Spiral Tower in Aichi, the Cyclone Tower in Asan, the West tower in Guangzhou, the Lotte super tower in Seoul, the Capital Gate in Abu Dhabi, the Bow project in Calgary, the Building of Qatar Ministry of Foreign Affairs in Doha. .           The diagrid systems are the evolution of braced tube structures, since the erimeter configuration sti ll holds for preserving the maximum bending resistance and rigidity, while, with respect to the braced tube, the mega-diagonal members are diffusely spread over the facade, giving rise to closely spaced diagonal elements and allowing for the complete elimination of the conventional vertical columns. Therefore the diagonal members in diagrid structures act both as inclined columns and as bracing elements, and carry gravity loads as well as lateral forces due to their triangulated configuration, mainly internal axial forces arise in the members, thus minimizing shear racking effects.To begin with the behavior of basic Diagrid   module is   discussed, followed by construction process. Then the merits and demerits of Diagrids are listed. CHAPTER-2 THE TRIANGULAR DIAGRID MODULE 2. 1   INTRODUCTION Diagrid structure is modeled as a beam, and subdivided longitudinally into modules according to this repetitive diagonal pattern. Each Diagrid module is defined by a si ngle level of diagonals that extend over ‘n’ stories. | Figure 1: 8 storey Diagrid with 60 degree diagonal angle| 2. 2 MODULE GEOMETRYDiagrid structures, like all the tubular configurations, utilize the overall building plan dimension for counteracting overturning moment and providing flexural rigidity through axial action in the diagonals, which acts as inclined columns; however, this potential bending efficiency of tubular configuration is never fully achievable, due to shear deformations that arise in the building â€Å"webs†; with this regard, diagrid systems, which provide shear resistance and rigidity by means of axial action in the diagonal members, rather than bending moment in beams and columns, allows for a nearly full exploitation of the theoretical bending resistance. Being the diagrid a triangulated configuration of structural members, the geometry of the single module plays a major role in the internal axial force distribution, as well as in conferr ing global shear and bending rigidity to the building structure. While a module angle equal to 35 ° ensures the maximum shear rigidity to the diagrid system, the maximum engagement of diagonal members for bending stiffness corresponds to an angle value of 90 °, i. e. vertical columns.Thus in diagrid systems, where vertical columns are completely eliminated and both shear and bending stiffness must be provided by diagonals, a balance between this two conflicting requirements should be searched for defining the optimal angle of the diagrid module. Usually Isosceles triangular geometry is used. i. OPTIMAL ANGLE: As in the diagrids, diagonals carry both shear and moment. Thus, the optimal angle of diagonals is highly dependent upon the building height. Since the optimal angle of the columns for maximum bending rigidity is 90 degrees and that of the diagonals for maximum shear rigidity is about 35 degrees, it is expected that the optimal angle of diagonal members fo rdiagrid structures will fall between these angles and as the building height increases, the optimal angle also increases. Usually adopted range is 60 -70 degree. i. MODULE DIMENSIONS: ?   Height of the module:  It depends on the number of stories stacked per module. Usually 2 – 6 stories are stacked per diagrid with average floor height varying from 3. 5 -4. 15 m on an average. ?   Base of the module:  It depends on the height and optimal angle (apex angle) of the diagrid. CHAPTER-3 STRUCTURAL  ACTION OF A DIAGRID MODULE 3. 1  EFFECT OF GRAVITY LOADING The diagrid module under gravity loads G is subjected to a downward vertical force, NG,mod, causes the two diagonals being both in compression and the horizontal chord in tension. | Figure 2: Effect of Gravity Loading. | 3. 2    EFFECT OF LATERAL LOADINGUnder horizontal load W, the overturning moment MW causes vertical forces in the apex joint of The diagrid modules, NW,mod, with direction and intensity of this force depending on the position of the Diagrid module, with upward / downward direction and maximum intensity in modules located on the Windward / leeward facades, respectively, and gradually decreasing values in modules located on the Web sides . | Figure 3: Effect of Lateral Loading. | 3. 3  EFFECT OF SHEAR LOADING The global shear VW causes a horizontal force in the apex joint of the diagrid modules, Vw,mod, which intensity depends on the position of the module with respect to the direction of wind load, i. e. the shear force VW is mainly absorbed by the modules located on the web facades, i. e. parallel to the load direction . | Figure 4: Effect of Shear Loading| 3. 4  EFFECT OF NON-APEX LOADINGFor deriving internal forces in the diagrid elements, it has been implicitly assumed that the external load is transferred to the diagrid module only at the apex node of the module itself. However, since the triangle module usua lly expands over a certain number of stories, transfer of loads to the module occurs at every floor level, thus also concentrated loads along the diagonal length are present ; as a consequence, bending moment and shear force are expected due to this load condition. However the introduction of a horizontal member at each floor girder to diagonal intersection allows for the absorption of the force component orthogonal to the diagonal direction, thus preserving the prevailing axial force condition. | Figure 5: Effect of non-apex loading. | 3.  EFFECT OF HORIZONTAL AND VERTICAL CURVATURE UNDER VERTICAL LOADING                                                                                                                        The above simplified analysis of the diagrid module has been carried out implicitly assuming that the plane of the triangular module coincides with the vertical plane; however, recent Applications often concern buildings characterized by curvilinear, non prismatic forms, which require the study of the diagrid curvature effect on the internal force distribution. In particular, by considering that the single module may be inclined of an angle  with respect to the vertical direction, the effect of   both gravity loads and overturning moment gives rise to an additional horizontal force, in the direction Orthogonal to the module plane.Therefore the chords of the diagrid modules, continuously connected Each other along the building perimeter at the diagonal intersections, also act as hopping elements or Ring beams, for absorbing these horizontal forces. | Figure 6: Effect o f vertical and horizontal curvature. | 3. 6  EFFECT OF HORIZONTAL CURVATURE UNDER HORIZONTAL LOADING When the building has a nonrectangular, rounded plans, similar effects due to this horizontal curvature develop under the action of Lateral shear, and the ring beams also collect these outward forces arising in the horizontal plane. | Figure 7: Effect of horizontal curvature. | 4. 1    MATERIALS USED FOR DIAGRIDDS: Material selection for a Diagrid construction is based on the following factors . They are: a)   Unit weight of the material. b)   Availability of the material. )   Lead Time. d)   Erection Time. e)   Flexibility. f)  Durability. g)   Labor cost. h)  Fire resistance. The basic materials used in Diagrid construction are Steel, Concrete and Wood. The relative merits and demerits of using them are discussed below. I. STEEL : Steel is by far the most popular material for Diagrid construc tions. The typical steel sections used are Wide flanges, Rectangular HSS and Round HSS. ? Steel Wide Flanges: Advantages- The weight and Size of wide flanges are optimized to resist the high bending loads many of the members experience. Thus use of wide flanges results in reduced structure weight and flexibility of size.The sections can be prefabricated in multi-panel sections, allowing quick erection by crane, reducing labor costs in the field. Disadvantages- Pre-fabrication of the Diagrid sections takes a longer lead time. ? Rectangular and Round HSS: Advantages- As with wide flanges, HSS sections can be prefabricated in multi-panel sections, allowing quick erection time, also reducing labor costs in the field. Disadvantages- Use of HSS sections will need a change in floor layouts as the beams will need to frame into the node points. This reduces the floor flexibility and efficiency. II. CONCRETE: Concrete is another widespread material for Diagrid constructions.It is used both in Precast and Cast-in-situ forms. ? Precast concrete: Advantages-The flexibility of precast sections allows them to fit to the complex building geometries. Concrete also offers extreme safety against structural fire damage. Disadvantages- The use of Concrete increases the dead load on the foundations, deflections of long spans, etc. Creep in concrete is also an issue. ? Cast-in-situ Concrete: Under an Efficient material management system, cast-in-situ concrete is the best material in terms of material cost. Lead time is virtually nothing as cast-in-situ is available on demand. III. TIMBER: Timber is the least popular material for Diagrid constructions.Advantages- Multi-panel sections can reduce erection time and labor cost. Disadvantages – Timber cost, both for material and connection, are much higher than the traditional structural materials of steel and concrete. Owing to its lesser material strength, the member sizes would be very large and hence is not preferred for major construction works. Durability and weathering of timber are other major issues. 4. 2 DIAGRID NODE DESIGN | Figure 8: Load path at Node| The diagrid segments are planned to minimize onsite butt welding and the welding locations illustrated in Figure 9. The load path can be divided into two main scenarios, vertical load and horizontal shear their combination), as shown in Figure 8.The vertical load will be transferred in the form of an axial load from the diagrid members above the node to the gusset plate and stiffeners, then to the diagrid members below the nodes as shown. The horizontal shear will be in the form of axial loads in the diagrid members above the node with one in compression and one in tension to the gusset plate and stiffeners. The force will then be transferred as shear force in the gusset plate and then to the other pair of tensile and compressive forces on the diagrid members below the node. From this load path, the shear force at the loca tion of bolt connections is high under lateral loads. Because this may create weak points at the node particularly during earthquakes, the strength of the bolts should be designed carefully. | Figure 9: Node Design Plan| 4.    NODE CONSTRUCTION FOR DIAGRID STRUCTURES Constructability is a serious issue in diagrid structures because the joints of diagrid structures are more complicated and tend to be more expensive than those of conventional orthogonal structures. In order to reduce jobsite work, prefabrication of nodal elements is essential. Due to the triangular configuration of the diagrid structural system, rigid connections are not necessary at the nodes, and pin connections using bolts can be made more conveniently at the jobsite. If considerately designed using appropriate prefabrication strategy, constructability will not be such a limiting factor of the diagrid structures.Prefabrication of diagrid nodes for conventional rectangular shape buildings can be done relatively easily and economically because many nodes of the same configuration are required in this case. The Hearst Headquarters in New York is the typical case. | Figure 10: Node detail for the Hearst Tower | The prefabricated nodes are connected to the large built-up diagonal members by bolts at the jobsite. As building form becomes more irregular, generating appropriate construction modules is critical for better constructability. Though it is possible to produce any complex shape construction module using today’s CAD/CAM technology, it is not the most economical solution. Extracting regularity from an irregular building form, and then adjusting the building form following the extracted regularity could be one approach.Another approach could be to make the construction modules relatively regular and design universal connections so that they can accommodate any irregularity. | Figure 11: A Diagrid node after fabrication| 4. 4ERECTION OF DIAGRID NODES During const ruction, the stability in the in-plane direction can be provided by the modules themselves and in the out-of-plane direction can be provided by the tie beams at the node. The temporary restraint to the diagrid and the construction may be minimized. The various steps in the Diagrid erection process include : ? In-place steel shop welding ?  Lifting up piece by piece. ?  Trial shop assembly of parts with high strength bolts. ?   In-place welding. ?   High strength bolts assembly. ?   Setting up perimeter girders |Figure 12: Construction Plan of Diagrid | | Figure 13: Diagrid Erection Process| CHAPTER-5 CASE STUDIES 5. 1  SWISS RE BUILDING | Figure 14: Swiss Re Building, London| 30 St. Mary Axe – also known as the Swiss Re Building – in London, is the first modern application and the most representative example of diagrid structure. Designed by Sir Norman Foster, with 40 stories  and an inter-story height of 4 . 15 m, the tower is 180 meters tall. The building is circular in plan with diameter changing along elevation, equal to 56 m at its widest point, at the 20 story, reducing to 49 m at ground level, and to 30 m at the 38 level, where a steel and glass dome tops off the building.The diagrid structure is generated by a pattern of intersecting diagonals which follow the helical path of the so called light wells, created for enforcing natural light and air circulation. It is formed by a series of steel triangles, two-story high and 9 m wide, with an intermediate tie connecting the two diagonals, which gives to the module the aspect of a â€Å"A-shape frame†. The diagonals are CHS members, with cross section between 508 x 40 mm at the lowest floors and 273 x 12. 5 mm at the top, while the chord members have RHS, 250 x 300 mm with wall thickness of 25mm. The circular central core, which has constant diameter along elevation, does not contribute to the lateral resistance and rigidity, being a simple frame structure. 5. 2 HEARST TOWERThe Hearst Tower in New York was designed by Sir Norman Foster; the building, 46 stories and 183 meters tall, has a prismatic form and a rectangular floor plan, 48 x 37m and is built on an existent 6 storey building. The diagrid structure, creating the characteristic â€Å"diamond effect†in the facade, rises from 12 composite columns, which reach the tenth floor starting from the ground level. The diagrid module is 12. 25 m wide and 16. 54 m high, and covers four stories. The diagonal cross section are I shape, with maximum size W14x370 at the base of the diagrid (tenth level), while the megacolumns between the tenth and the ground level are concrete filled box section 1100 x 1100 x 10m. | Figure 15: The Hearst Tower, New York. | 5. 3 GUANGZHOU WEST TOWERThe Guangzhou West Tower, designed by Wilkinson Eyre architects, London with 103 stories and a height of 440m, is the tallest building in China and one of the tallest in the world. The building has a curvilinear shape along elevation and the floor plate is an equilateral triangle with round-corners, with side 65 m at the base, increasing to a maximum value of 65 m at approximately 1/3 of the way up the building, at which point the side begins to reduce, up to 43. 5 m at the top. It has a composite structure, made by a central concrete core and perimeter diagrid structure, with the diagrid module expanding on six stories, 12. 4 m wide and 24. 8 m high. The diagonals are steel tubular members filled by concrete (CFST), with size ranging between 1080 x 55 mm at the first floor and 700 x 20mm at the top.The concrete core has a triangle shape with chamfered corners and fully participates to the lateral resistance up to the seventh floor, where it is eliminated, leaving place to a central giant atrium for the hotel which occupies the upper floors. | Figure 16: Guangzhou West Tower, China| CHAPTER-6 MERITS AND DEMERITS OF DIAGRIDS 6. 1     MERITS OF DIAGRIDS: Some major benefits of using Diagrids in structures are discussed below. 1)   The Diagrid structures besides the service core have mostly column free exterior and interior, hence  free and clear, unique floor plans are Possible. 2)  The Glass facades and dearth of interior columns allow generous amounts of day lighting into the structure. 3)   The use of Diagrids results in roughly 1/5th(20%) reduction in steel as compared to Braced frame structures. )   The construction techniques involved are simple, yet they need to be perfect. 5)   The Diagrids makes maximum exploitation of the structural Material. 6)  The diagrid Structures are aesthetically dominant and expressive. 7)  Redundancy in the DiaGrid design is obvious. It is this redundancy then that can transfer load from a failed portion of the structure to another. Skyscraper structural failure, as it is such an important/ promi nent topic, can be minimized in a DiaGrid design A DiaGrid has better ability to redistribute load than a Moment Frame skyscraper. Thus creating a deserved appeal for the DiaGrid in today’s landscape of building. 6.       DEMERITS OF DIAGRIDS: Some demerits of using Diagrids are mentioned below: 1)  As of yet, the Diagrid Construction techniques are not  thoroughly explored. 2)  Lack of availability of skilled workers . Construction crews have little or no experience  creating a DiaGrid skyscraper. 3)   The DiaGrid can dominate aesthetically, which can be an issue depending upon design intent. 4)  It is hard to design windows that create a regular language from floor to floor. 5)  The DiaGrid is heavy-handed ( can be clumsy or unstable) if not executed properly. CHAPTER -7 CONCLUSION We are at a time when the global population is inching the 7 billion mark.Around the globe we witness frequent recurrence of natural calamities, depletion and degradation of vital life supporting systems, all presumed to be the impacts of Global warming, making life miserable on earth. It is high time for humanity to switch to sustainable and eco-friendly lines of infrastructure development. The construction industry, the greatest contributor to green house emissions, has the moral obligation to play the lead. The most stable and sustainable of ecosystems is the natural ecosystems. Attainment of sustainability goals would require sound knowledge and understanding of nature’s mechanisms and modeling of all artificial infrastructure in close resemblance to it.Owing to the complexity due to size and geometry of the natural systems, development of artificial infrastructure on the lines of biomimicking principles, is in fact the greatest challenge the modern day builder would have to confront with. Thus a modern day structural system should have extreme efficiency in terms of strength, expression, and geometric versatility. Most of the present structural systems are highly advanced in terms of structural efficiency and aesthetic quality, but lacks the much needed geometric versatility. As we have seen, the diagrids, the latest mutation of tubular structures, has in addition to strength and aesthetics, that extra quality of geometric versatility, making it the most suited structural system to this respect.Thus the diagrid, with an optimal combination of qualities of aesthetic expression, structural efficiency and geometric versatility is indeed the language of the modern day builder. REFERENCES 1. MOON, K. , CONNOR, J. J. and FERNANDEZ, J. E. (2007). Diagrid Structural Systems for Tall Buildings: Characteristics and Methodology for Preliminary Design, The Structural Design of Tall and Special Buildings, Vol. 16. 2, pp 205-230. 2. MAURIZIO TORENO (2011). An overview on diagrid structures for tall buildings, Structural Engineers World Congress 2011. 3. KIM JONG SOO, KIM YOUNG SIK, LHO SEUNG HEE(2008). Structural Schematic Design of a Tall Building in Asan using the Diagrid System, CTBUH 8th World Congress, 2008. Diagrid DIAGRID : THE LANGUAGE OF MODERN DAY BUILDER ABSTRACT Design and construction of artificial infrastructure on the lines of  biomimicking principles requires the development of highly advanced structural systems which has the qualities of aesthetic expression, structural efficiency and most importantly geometric versatility. Diagrids, the latest mutation of tubular structures, have an optimum combination of the above qualities. In this paper, the peculiarities of the Diagrid, its structural behavior under loading and the design and construction of diagrid nodes are described.A case study of some recent diagrid tall buildings, namely the Swiss Re Building in London, the Hearst Tower in New York, and the West Guangzhou Tower in china is also presented. CONTENTS 1. INTRODUCTION 2. THE TRIANGULAR DIAGRID MODULE 2. 1         INTRODUCTION 2. 2          MODULE GEOMETRY 3. STRUCTURAL   ACTION OF A DIAGRID MODULE 3. 1       EFFECT OF GRAVITY LOADING 3. 2       EFFECT OF LATERAL LOADING 3. 3       EFFECT OF SHEAR LOADING 3. 4       EFFECT OF NON-APEX LOADING 3. 5 EFFECT OF HORIZONTAL AND VERTICAL CURVATURE UNDER VERTICAL LOADING 3.       EFFECT OF HORIZONTAL CURVATURE UNDER HORIZONTAL LOADING 4. DESIGN AND CONSTRUCTION OF DIAGRID NODES 4. 1                MATERIALS  USED FOR DIAGRIDS 4. 2                 DIAGRID NODE DESIGN 4. 3                NODE CONSTRUCTION FOR DIAGRID STRUCTURES 4. 4                ERECTION OF DIAGRID NODES 5. CASE STUDIES 5. 1           SWISS RE BUILDING 5. 2          HEARST TOWER 5. 3Â Â Â Â Â Â Â à ‚   GUANGZHOU WEST TOWER 6. MERITS AND DEMERITS OF DIAGRIDS 6. 1    MERITS OF DIAGRIDS 6. 2                DEMERITS OF DIAGRIDS               7. CONCLUSION CHAPTER-1 INTRODUCTIONThe Diagrids are perimeter structural configurations characterized by a narrow grid of diagonal members which are involved both in gravity and in lateral load resistance. Diagonalized applications of structural steel members for providing efficient solutions both in terms of strength and stiffness are not new ,however nowadays a renewed interest in and a widespread application of diagrid is registered with reference to large span and high rise buildings, particularly when they are characterized by complex geometries and curved shapes, sometimes by completely free forms.Compared to conventional orthogonal structures for tall buildings such as framed tubes, diagrid structures carry lateral wind loads much more efficiently by their diagonal members’ axial action. ;               Among the large-span buildings some examples are represented by the Seatlle Library, the London City Hall, the One Shelley Street in Sydney, and more recently by several outstanding Pavilions realized at the Shanghai 2010 Expo, (e. g. France, UAE) as well as by some dazzling projects like the Astana National library.Among tall buildings, noteworthy examples are the Swiss Re building in London, the Hearst tower in New York, the CCTV headquarters building in Beijing, the Mode Gakuen Spiral Tower in Aichi, the Cyclone Tower in Asan, the West tower in Guangzhou, the Lotte super tower in Seoul, the Capital Gate in Abu Dhabi, the Bow project in Calgary, the Building of Qatar Ministry of Foreign Affairs in Doha. .           The diagrid systems are the evolution of braced tube structures, since the erimeter configuration sti ll holds for preserving the maximum bending resistance and rigidity, while, with respect to the braced tube, the mega-diagonal members are diffusely spread over the facade, giving rise to closely spaced diagonal elements and allowing for the complete elimination of the conventional vertical columns. Therefore the diagonal members in diagrid structures act both as inclined columns and as bracing elements, and carry gravity loads as well as lateral forces due to their triangulated configuration, mainly internal axial forces arise in the members, thus minimizing shear racking effects.To begin with the behavior of basic Diagrid   module is   discussed, followed by construction process. Then the merits and demerits of Diagrids are listed. CHAPTER-2 THE TRIANGULAR DIAGRID MODULE 2. 1   INTRODUCTION Diagrid structure is modeled as a beam, and subdivided longitudinally into modules according to this repetitive diagonal pattern. Each Diagrid module is defined by a si ngle level of diagonals that extend over ‘n’ stories. | Figure 1: 8 storey Diagrid with 60 degree diagonal angle| 2. 2 MODULE GEOMETRYDiagrid structures, like all the tubular configurations, utilize the overall building plan dimension for counteracting overturning moment and providing flexural rigidity through axial action in the diagonals, which acts as inclined columns; however, this potential bending efficiency of tubular configuration is never fully achievable, due to shear deformations that arise in the building â€Å"webs†; with this regard, diagrid systems, which provide shear resistance and rigidity by means of axial action in the diagonal members, rather than bending moment in beams and columns, allows for a nearly full exploitation of the theoretical bending resistance. Being the diagrid a triangulated configuration of structural members, the geometry of the single module plays a major role in the internal axial force distribution, as well as in conferr ing global shear and bending rigidity to the building structure. While a module angle equal to 35 ° ensures the maximum shear rigidity to the diagrid system, the maximum engagement of diagonal members for bending stiffness corresponds to an angle value of 90 °, i. e. vertical columns.Thus in diagrid systems, where vertical columns are completely eliminated and both shear and bending stiffness must be provided by diagonals, a balance between this two conflicting requirements should be searched for defining the optimal angle of the diagrid module. Usually Isosceles triangular geometry is used. i. OPTIMAL ANGLE: As in the diagrids, diagonals carry both shear and moment. Thus, the optimal angle of diagonals is highly dependent upon the building height. Since the optimal angle of the columns for maximum bending rigidity is 90 degrees and that of the diagonals for maximum shear rigidity is about 35 degrees, it is expected that the optimal angle of diagonal members fo rdiagrid structures will fall between these angles and as the building height increases, the optimal angle also increases. Usually adopted range is 60 -70 degree. i. MODULE DIMENSIONS: ?   Height of the module:  It depends on the number of stories stacked per module. Usually 2 – 6 stories are stacked per diagrid with average floor height varying from 3. 5 -4. 15 m on an average. ?   Base of the module:  It depends on the height and optimal angle (apex angle) of the diagrid. CHAPTER-3 STRUCTURAL  ACTION OF A DIAGRID MODULE 3. 1  EFFECT OF GRAVITY LOADING The diagrid module under gravity loads G is subjected to a downward vertical force, NG,mod, causes the two diagonals being both in compression and the horizontal chord in tension. | Figure 2: Effect of Gravity Loading. | 3. 2    EFFECT OF LATERAL LOADINGUnder horizontal load W, the overturning moment MW causes vertical forces in the apex joint of The diagrid modules, NW,mod, with direction and intensity of this force depending on the position of the Diagrid module, with upward / downward direction and maximum intensity in modules located on the Windward / leeward facades, respectively, and gradually decreasing values in modules located on the Web sides . | Figure 3: Effect of Lateral Loading. | 3. 3  EFFECT OF SHEAR LOADING The global shear VW causes a horizontal force in the apex joint of the diagrid modules, Vw,mod, which intensity depends on the position of the module with respect to the direction of wind load, i. e. the shear force VW is mainly absorbed by the modules located on the web facades, i. e. parallel to the load direction . | Figure 4: Effect of Shear Loading| 3. 4  EFFECT OF NON-APEX LOADINGFor deriving internal forces in the diagrid elements, it has been implicitly assumed that the external load is transferred to the diagrid module only at the apex node of the module itself. However, since the triangle module usua lly expands over a certain number of stories, transfer of loads to the module occurs at every floor level, thus also concentrated loads along the diagonal length are present ; as a consequence, bending moment and shear force are expected due to this load condition. However the introduction of a horizontal member at each floor girder to diagonal intersection allows for the absorption of the force component orthogonal to the diagonal direction, thus preserving the prevailing axial force condition. | Figure 5: Effect of non-apex loading. | 3.  EFFECT OF HORIZONTAL AND VERTICAL CURVATURE UNDER VERTICAL LOADING                                                                                                                        The above simplified analysis of the diagrid module has been carried out implicitly assuming that the plane of the triangular module coincides with the vertical plane; however, recent Applications often concern buildings characterized by curvilinear, non prismatic forms, which require the study of the diagrid curvature effect on the internal force distribution. In particular, by considering that the single module may be inclined of an angle  with respect to the vertical direction, the effect of   both gravity loads and overturning moment gives rise to an additional horizontal force, in the direction Orthogonal to the module plane.Therefore the chords of the diagrid modules, continuously connected Each other along the building perimeter at the diagonal intersections, also act as hopping elements or Ring beams, for absorbing these horizontal forces. | Figure 6: Effect o f vertical and horizontal curvature. | 3. 6  EFFECT OF HORIZONTAL CURVATURE UNDER HORIZONTAL LOADING When the building has a nonrectangular, rounded plans, similar effects due to this horizontal curvature develop under the action of Lateral shear, and the ring beams also collect these outward forces arising in the horizontal plane. | Figure 7: Effect of horizontal curvature. | 4. 1    MATERIALS USED FOR DIAGRIDDS: Material selection for a Diagrid construction is based on the following factors . They are: a)   Unit weight of the material. b)   Availability of the material. )   Lead Time. d)   Erection Time. e)   Flexibility. f)  Durability. g)   Labor cost. h)  Fire resistance. The basic materials used in Diagrid construction are Steel, Concrete and Wood. The relative merits and demerits of using them are discussed below. I. STEEL : Steel is by far the most popular material for Diagrid construc tions. The typical steel sections used are Wide flanges, Rectangular HSS and Round HSS. ? Steel Wide Flanges: Advantages- The weight and Size of wide flanges are optimized to resist the high bending loads many of the members experience. Thus use of wide flanges results in reduced structure weight and flexibility of size.The sections can be prefabricated in multi-panel sections, allowing quick erection by crane, reducing labor costs in the field. Disadvantages- Pre-fabrication of the Diagrid sections takes a longer lead time. ? Rectangular and Round HSS: Advantages- As with wide flanges, HSS sections can be prefabricated in multi-panel sections, allowing quick erection time, also reducing labor costs in the field. Disadvantages- Use of HSS sections will need a change in floor layouts as the beams will need to frame into the node points. This reduces the floor flexibility and efficiency. II. CONCRETE: Concrete is another widespread material for Diagrid constructions.It is used both in Precast and Cast-in-situ forms. ? Precast concrete: Advantages-The flexibility of precast sections allows them to fit to the complex building geometries. Concrete also offers extreme safety against structural fire damage. Disadvantages- The use of Concrete increases the dead load on the foundations, deflections of long spans, etc. Creep in concrete is also an issue. ? Cast-in-situ Concrete: Under an Efficient material management system, cast-in-situ concrete is the best material in terms of material cost. Lead time is virtually nothing as cast-in-situ is available on demand. III. TIMBER: Timber is the least popular material for Diagrid constructions.Advantages- Multi-panel sections can reduce erection time and labor cost. Disadvantages – Timber cost, both for material and connection, are much higher than the traditional structural materials of steel and concrete. Owing to its lesser material strength, the member sizes would be very large and hence is not preferred for major construction works. Durability and weathering of timber are other major issues. 4. 2 DIAGRID NODE DESIGN | Figure 8: Load path at Node| The diagrid segments are planned to minimize onsite butt welding and the welding locations illustrated in Figure 9. The load path can be divided into two main scenarios, vertical load and horizontal shear their combination), as shown in Figure 8.The vertical load will be transferred in the form of an axial load from the diagrid members above the node to the gusset plate and stiffeners, then to the diagrid members below the nodes as shown. The horizontal shear will be in the form of axial loads in the diagrid members above the node with one in compression and one in tension to the gusset plate and stiffeners. The force will then be transferred as shear force in the gusset plate and then to the other pair of tensile and compressive forces on the diagrid members below the node. From this load path, the shear force at the loca tion of bolt connections is high under lateral loads. Because this may create weak points at the node particularly during earthquakes, the strength of the bolts should be designed carefully. | Figure 9: Node Design Plan| 4.    NODE CONSTRUCTION FOR DIAGRID STRUCTURES Constructability is a serious issue in diagrid structures because the joints of diagrid structures are more complicated and tend to be more expensive than those of conventional orthogonal structures. In order to reduce jobsite work, prefabrication of nodal elements is essential. Due to the triangular configuration of the diagrid structural system, rigid connections are not necessary at the nodes, and pin connections using bolts can be made more conveniently at the jobsite. If considerately designed using appropriate prefabrication strategy, constructability will not be such a limiting factor of the diagrid structures.Prefabrication of diagrid nodes for conventional rectangular shape buildings can be done relatively easily and economically because many nodes of the same configuration are required in this case. The Hearst Headquarters in New York is the typical case. | Figure 10: Node detail for the Hearst Tower | The prefabricated nodes are connected to the large built-up diagonal members by bolts at the jobsite. As building form becomes more irregular, generating appropriate construction modules is critical for better constructability. Though it is possible to produce any complex shape construction module using today’s CAD/CAM technology, it is not the most economical solution. Extracting regularity from an irregular building form, and then adjusting the building form following the extracted regularity could be one approach.Another approach could be to make the construction modules relatively regular and design universal connections so that they can accommodate any irregularity. | Figure 11: A Diagrid node after fabrication| 4. 4ERECTION OF DIAGRID NODES During const ruction, the stability in the in-plane direction can be provided by the modules themselves and in the out-of-plane direction can be provided by the tie beams at the node. The temporary restraint to the diagrid and the construction may be minimized. The various steps in the Diagrid erection process include : ? In-place steel shop welding ?  Lifting up piece by piece. ?  Trial shop assembly of parts with high strength bolts. ?   In-place welding. ?   High strength bolts assembly. ?   Setting up perimeter girders |Figure 12: Construction Plan of Diagrid | | Figure 13: Diagrid Erection Process| CHAPTER-5 CASE STUDIES 5. 1  SWISS RE BUILDING | Figure 14: Swiss Re Building, London| 30 St. Mary Axe – also known as the Swiss Re Building – in London, is the first modern application and the most representative example of diagrid structure. Designed by Sir Norman Foster, with 40 stories  and an inter-story height of 4 . 15 m, the tower is 180 meters tall. The building is circular in plan with diameter changing along elevation, equal to 56 m at its widest point, at the 20 story, reducing to 49 m at ground level, and to 30 m at the 38 level, where a steel and glass dome tops off the building.The diagrid structure is generated by a pattern of intersecting diagonals which follow the helical path of the so called light wells, created for enforcing natural light and air circulation. It is formed by a series of steel triangles, two-story high and 9 m wide, with an intermediate tie connecting the two diagonals, which gives to the module the aspect of a â€Å"A-shape frame†. The diagonals are CHS members, with cross section between 508 x 40 mm at the lowest floors and 273 x 12. 5 mm at the top, while the chord members have RHS, 250 x 300 mm with wall thickness of 25mm. The circular central core, which has constant diameter along elevation, does not contribute to the lateral resistance and rigidity, being a simple frame structure. 5. 2 HEARST TOWERThe Hearst Tower in New York was designed by Sir Norman Foster; the building, 46 stories and 183 meters tall, has a prismatic form and a rectangular floor plan, 48 x 37m and is built on an existent 6 storey building. The diagrid structure, creating the characteristic â€Å"diamond effect†in the facade, rises from 12 composite columns, which reach the tenth floor starting from the ground level. The diagrid module is 12. 25 m wide and 16. 54 m high, and covers four stories. The diagonal cross section are I shape, with maximum size W14x370 at the base of the diagrid (tenth level), while the megacolumns between the tenth and the ground level are concrete filled box section 1100 x 1100 x 10m. | Figure 15: The Hearst Tower, New York. | 5. 3 GUANGZHOU WEST TOWERThe Guangzhou West Tower, designed by Wilkinson Eyre architects, London with 103 stories and a height of 440m, is the tallest building in China and one of the tallest in the world. The building has a curvilinear shape along elevation and the floor plate is an equilateral triangle with round-corners, with side 65 m at the base, increasing to a maximum value of 65 m at approximately 1/3 of the way up the building, at which point the side begins to reduce, up to 43. 5 m at the top. It has a composite structure, made by a central concrete core and perimeter diagrid structure, with the diagrid module expanding on six stories, 12. 4 m wide and 24. 8 m high. The diagonals are steel tubular members filled by concrete (CFST), with size ranging between 1080 x 55 mm at the first floor and 700 x 20mm at the top.The concrete core has a triangle shape with chamfered corners and fully participates to the lateral resistance up to the seventh floor, where it is eliminated, leaving place to a central giant atrium for the hotel which occupies the upper floors. | Figure 16: Guangzhou West Tower, China| CHAPTER-6 MERITS AND DEMERITS OF DIAGRIDS 6. 1     MERITS OF DIAGRIDS: Some major benefits of using Diagrids in structures are discussed below. 1)   The Diagrid structures besides the service core have mostly column free exterior and interior, hence  free and clear, unique floor plans are Possible. 2)  The Glass facades and dearth of interior columns allow generous amounts of day lighting into the structure. 3)   The use of Diagrids results in roughly 1/5th(20%) reduction in steel as compared to Braced frame structures. )   The construction techniques involved are simple, yet they need to be perfect. 5)   The Diagrids makes maximum exploitation of the structural Material. 6)  The diagrid Structures are aesthetically dominant and expressive. 7)  Redundancy in the DiaGrid design is obvious. It is this redundancy then that can transfer load from a failed portion of the structure to another. Skyscraper structural failure, as it is such an important/ promi nent topic, can be minimized in a DiaGrid design A DiaGrid has better ability to redistribute load than a Moment Frame skyscraper. Thus creating a deserved appeal for the DiaGrid in today’s landscape of building. 6.       DEMERITS OF DIAGRIDS: Some demerits of using Diagrids are mentioned below: 1)  As of yet, the Diagrid Construction techniques are not  thoroughly explored. 2)  Lack of availability of skilled workers . Construction crews have little or no experience  creating a DiaGrid skyscraper. 3)   The DiaGrid can dominate aesthetically, which can be an issue depending upon design intent. 4)  It is hard to design windows that create a regular language from floor to floor. 5)  The DiaGrid is heavy-handed ( can be clumsy or unstable) if not executed properly. CHAPTER -7 CONCLUSION We are at a time when the global population is inching the 7 billion mark.Around the globe we witness frequent recurrence of natural calamities, depletion and degradation of vital life supporting systems, all presumed to be the impacts of Global warming, making life miserable on earth. It is high time for humanity to switch to sustainable and eco-friendly lines of infrastructure development. The construction industry, the greatest contributor to green house emissions, has the moral obligation to play the lead. The most stable and sustainable of ecosystems is the natural ecosystems. Attainment of sustainability goals would require sound knowledge and understanding of nature’s mechanisms and modeling of all artificial infrastructure in close resemblance to it.Owing to the complexity due to size and geometry of the natural systems, development of artificial infrastructure on the lines of biomimicking principles, is in fact the greatest challenge the modern day builder would have to confront with. Thus a modern day structural system should have extreme efficiency in terms of strength, expression, and geometric versatility. Most of the present structural systems are highly advanced in terms of structural efficiency and aesthetic quality, but lacks the much needed geometric versatility. As we have seen, the diagrids, the latest mutation of tubular structures, has in addition to strength and aesthetics, that extra quality of geometric versatility, making it the most suited structural system to this respect.Thus the diagrid, with an optimal combination of qualities of aesthetic expression, structural efficiency and geometric versatility is indeed the language of the modern day builder. REFERENCES 1. MOON, K. , CONNOR, J. J. and FERNANDEZ, J. E. (2007). Diagrid Structural Systems for Tall Buildings: Characteristics and Methodology for Preliminary Design, The Structural Design of Tall and Special Buildings, Vol. 16. 2, pp 205-230. 2. MAURIZIO TORENO (2011). An overview on diagrid structures for tall buildings, Structural Engineers World Congress 2011. 3. KIM JONG SOO, KIM YOUNG SIK, LHO SEUNG HEE(2008). Structural Schematic Design of a Tall Building in Asan using the Diagrid System, CTBUH 8th World Congress, 2008.
Friday, January 3, 2020
A Brief Note On Cyber Security And Network Breaches Essay
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