The Experts below are selected from a list of 321 Experts worldwide ranked by ideXlab platform
Cheng-horng Lin - One of the best experts on this subject based on the ideXlab platform.
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Seismicity increase after the construction of the world's Tallest Building: An active blind fault beneath the Taipei 101
Geophysical Research Letters, 2005Co-Authors: Cheng-horng LinAbstract:[1] Seismic activity began to slightly increase during the construction but rose sharply upon the completion of the Tallest Building in the world, the Taipei 101, which stands at 508 m in the Taipei basin, where local seismicity had historically very low. Besides an increase in both seismic energy and the number of micro-earthquakes, two felt earthquakes astonishingly occurred beneath the completed Building. The focal mechanism of the larger felt earthquake and its aftershocks are indicative of an active blind normal fault just beneath the Building. Estimations of the vertical loading of the Taipei 101 show that local stress on its foundation increased at least 4.7 bars, making it seem likely that the increased seismicity was a direct product of the loading of the mega-structure. Further investigations in unison with continuous seismic monitoring must be conducted because the safety of the high-rise Building in the Taipei basin be comprehensively assessed.
Bowen Yan - One of the best experts on this subject based on the ideXlab platform.
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Monitoring and time-dependent analysis of vertical deformations of the Tallest Building in China
Structural Control and Health Monitoring, 2016Co-Authors: Hui Wang, Kang Zhou, Bowen YanAbstract:Summary Ping-An Finance Center (PAFC) in Shenzhen, with a structural height of 597 m and a total height of 660 m, is currently the second Tallest Building in the world and the Tallest in China. In this paper, based on the outputs of a structural health monitoring system installed in PAFC, a combined study of both on-site measurements and numerical analysis of the vertical deformations (axial shortenings) of the super tall Building during its various construction stages is carried out. It is worth noting that a novel strategy to adjust the elevation of each floor of PAFC was implemented in the design and construction of the super tall Building, in which the floor-to-floor height is modestly increased to compensate for the axial shortenings of gravity load bearing elements during the construction process and in-service stage. This design strategy is referred to as elevation reservation, and its effectiveness is verified through the field measurements of the vertical deformations in this study. A good agreement is found between the numerical results and the field measurements, which validates the finite element models of PAFC at different construction stages. The finite element models are further used to investigate the time-dependent effects due to the construction sequence and the shrinkage and creep of concrete on the vertical deformations. The numerical results show that the vertical deformations would be seriously underestimated without consideration of the time-dependent effects. The outcomes of this study would be of interest and practical use for engineers and researchers involved in the structural design, construction, and structural health monitoring of super tall Buildings.
Moncef L. Nehdi - One of the best experts on this subject based on the ideXlab platform.
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Only tall things cast shadows: Opportunities, challenges and research needs of self-consolidating concrete in super-tall Buildings
Construction and Building Materials, 2013Co-Authors: Moncef L. NehdiAbstract:Abstract The world’s Tallest skyscrapers are taking concrete to ever higher altitudes. Indeed, high-strength flowable concrete has become a material of choice for the construction of tall Buildings. However, technological challenges associated with using concrete in super-tall Buildings are daunting. For instance, Dubai’s Burj Khalifa, the world’s Tallest Building completed in 2010 standing 828-m tall with 163 floors, had plans to take concrete higher abandoned somewhere around an altitude of 580-m due to pumping challenges. In 2012, the Holy City of Makah’s Royal Clock Tower became the world’s second Tallest Building, standing 601-m tall. This Building also experienced the dares of pumping concrete beyond 520-m in height. The City of Jeddah’s Kingdom Tower is expected to exceed one kilometer in height upon completion and will take concrete higher than ever before in stringent hot weather conditions. This article discusses the experience with flowable and self-consolidating concrete in skyscrapers, examines the opportunities and technical challenges facing SCC construction in super-tall Buildings and highlights needed innovations and technological breakthroughs.
J. Boyer - One of the best experts on this subject based on the ideXlab platform.
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Mechanical and Electrical Systems for the Tallest Building/Man-Made Structure in the World: A Burj Dubai Case Study
2006Co-Authors: R. Frechette, L. Leung, J. BoyerAbstract:The Burj Dubai (Tower of Dubai) is a mixed-use Building of approximately 5 million square feet that will include high end residential, boutique offices and the world’s first Armani Hotel. Standing at over 150 stories (final height is confidential); Burj Dubai will achieve the status of the Tallest Building and construction in the world, upon its completion in 2009. This paper will present the mechanical and electrical solutions purposed by our Chicago engineering team to harsh environment. Additional challenges associated with any super-tall Building design, such as reverse stack effect mitigation, will also be addressed. Integral to best design practice was the integration of sustainable strategies to the base Building services. These strategies include a condensate recovery system, heat pipes, heat wheels for energy recovery, use of high performance glass, and a ventilated double wall facade in the entry pavilions were all integral aspects of the final design. ESL-HH-06-07-19 Proceedings of the Fifteenth Symposium on Improving Building Systems in Hot and Humid Climates, Orlando, FL, July 24-26, 2006 GENERAL Building DESCRIPTION Upon completion, the Burj Dubai designed and engineered by Skidmore, Owings & Merrill LLP (Chicago) will be the world’s Tallest Building as well as the world’s Tallest man-made structure. When completed, it will hold the record in all four categories as recognized by the Council on Tall Buildings and Urban Habitat and have the highest publicly accessible observation deck. The Burj Dubai is a large scale mixed-use project primarily consisting of luxury condominiums, and a five-star Armani Hotel consisting of hotel units and hotel residences. The tower’s gross area is approximately 312,400 sm (3,362,675 sf) above grade, with a total of 439,935 sm (4,735,430 sf) including below grade levels. Floor plate sizes range from 3,065 sm (33,000 sf) at the lower (hotel) levels to 380 sm (4,120 sf) at the upper level communications floors. Basement levels at the podium are approx 35,300 sm (380,000 sf) per level and are designed to accommodate approximately 2,500 cars. The Building has a peak cooling load of approximately 13,000 tons of cooling. The design of the Burj Dubai is derived from the geometries of the desert flower and the patterning systems embodied in Islamic architecture. It combines these historical and cultural influences with cutting-edge technology to achieve a high-performance Building which will set the new standard for development in the Middle East and become the model for the future of the city of Dubai. Beyond simply being iconic, the mechanical systems and innovations incorporated into the design will serve to define a new standard for super high rise design for the hot and humid climate. CLIMATE DATA AND GENERAL CONSIDERATIONS The city of Dubai is located at 25°15’ N latitude and 55°19’ E longitude and is situated along the coast of the Persian Gulf. Its location coincides with the northern edge of the earth’s equatorial region, an area influenced by so-called trade wind patterns. The climate is classified as arid sub-tropical and is characterized by average diurnal temperature fluctuations, dampened by its proximity to the gulf. Winter months are mild with a 50°F design temperature while summers temperatures mid-day may reach a 115°F DB design temperature. Dubai also experiences a greater level of humidity than nearby inland regions, with an 85°F WB design temperature. Rainfall is sporadic, though potentially heavy; typically occurring only during the winter season.
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mechanical and electrical systems for the Tallest Building man made structure in the world a burj dubai case study
2006Co-Authors: R. Frechette, L. Leung, J. BoyerAbstract:The Burj Dubai (Tower of Dubai) is a mixed-use Building of approximately 5 million square feet that will include high end residential, boutique offices and the world’s first Armani Hotel. Standing at over 150 stories (final height is confidential); Burj Dubai will achieve the status of the Tallest Building and construction in the world, upon its completion in 2009. This paper will present the mechanical and electrical solutions purposed by our Chicago engineering team to harsh environment. Additional challenges associated with any super-tall Building design, such as reverse stack effect mitigation, will also be addressed. Integral to best design practice was the integration of sustainable strategies to the base Building services. These strategies include a condensate recovery system, heat pipes, heat wheels for energy recovery, use of high performance glass, and a ventilated double wall facade in the entry pavilions were all integral aspects of the final design. ESL-HH-06-07-19 Proceedings of the Fifteenth Symposium on Improving Building Systems in Hot and Humid Climates, Orlando, FL, July 24-26, 2006 GENERAL Building DESCRIPTION Upon completion, the Burj Dubai designed and engineered by Skidmore, Owings & Merrill LLP (Chicago) will be the world’s Tallest Building as well as the world’s Tallest man-made structure. When completed, it will hold the record in all four categories as recognized by the Council on Tall Buildings and Urban Habitat and have the highest publicly accessible observation deck. The Burj Dubai is a large scale mixed-use project primarily consisting of luxury condominiums, and a five-star Armani Hotel consisting of hotel units and hotel residences. The tower’s gross area is approximately 312,400 sm (3,362,675 sf) above grade, with a total of 439,935 sm (4,735,430 sf) including below grade levels. Floor plate sizes range from 3,065 sm (33,000 sf) at the lower (hotel) levels to 380 sm (4,120 sf) at the upper level communications floors. Basement levels at the podium are approx 35,300 sm (380,000 sf) per level and are designed to accommodate approximately 2,500 cars. The Building has a peak cooling load of approximately 13,000 tons of cooling. The design of the Burj Dubai is derived from the geometries of the desert flower and the patterning systems embodied in Islamic architecture. It combines these historical and cultural influences with cutting-edge technology to achieve a high-performance Building which will set the new standard for development in the Middle East and become the model for the future of the city of Dubai. Beyond simply being iconic, the mechanical systems and innovations incorporated into the design will serve to define a new standard for super high rise design for the hot and humid climate. CLIMATE DATA AND GENERAL CONSIDERATIONS The city of Dubai is located at 25°15’ N latitude and 55°19’ E longitude and is situated along the coast of the Persian Gulf. Its location coincides with the northern edge of the earth’s equatorial region, an area influenced by so-called trade wind patterns. The climate is classified as arid sub-tropical and is characterized by average diurnal temperature fluctuations, dampened by its proximity to the gulf. Winter months are mild with a 50°F design temperature while summers temperatures mid-day may reach a 115°F DB design temperature. Dubai also experiences a greater level of humidity than nearby inland regions, with an 85°F WB design temperature. Rainfall is sporadic, though potentially heavy; typically occurring only during the winter season.
Ching-chang Chang - One of the best experts on this subject based on the ideXlab platform.
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Structural Design of Taipei 101, the World's Tallest Building
2004Co-Authors: Dennis C. K. Poon, Shaw-song Shieh, Leonard Joseph, Ching-chang ChangAbstract:At 101 stories and 508 m above grade, the Taipei 101 tower is the newest World’s Tallest Building. Collaboration between architects and engineers satisfied demands of esthetics, real estate economics, construction, occupant comfort in mild-to-moderate winds, and structural safety in typhoons and earthquakes. Its architectural design, eight eight-story modules standing atop a tapering base, evokes indigenous jointed bamboo and tiered pagodas. Building shape refinements from wind tunnel studies dramatically reduced accelerations and overturning forces from vortex shedding. The structural framing system of braced core and multiple outriggers accommodates numerous Building setbacks. A secondary lateral load system of perimeter moment frames and special core connections adds to seismic safety. Column axial stiffness for drift control was made practical through steel boxes filled with high-strength concrete. Occupant comfort is improved by a massive rooftop pendulum Tuned Mass Damper. Pinnacle framing fatigue life is enhanced by a pair of compact spring-driven TMDs. The soft soil subgrade required mat foundations on bored piles, slurry walls, and a mix of top-down and conventional bottom-up construction with cross-lot bracing. The project illustrates the large and small design decisions in both architecture and engineering necessary to successfully complete a major Building in a challenging environment.
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Reaching for the Sky
Civil Engineering, 2004Co-Authors: Dennis C. K. Poon, Shaw-song Shieh, Leonard Joseph, Ching-chang ChangAbstract:Tapei 101—soon to open its doors as the world’s Tallest Building—will resist devastating typhoons, earthquakes, and sway with an ingenious system of outrigger trusses, supercolumns, and tuned-mass dampers.