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RISS 인기검색어
- 검색키워드
- 저자 : Yongjing Tang (검색결과 3 건)
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Field Testing and Analysis During Top-down Construction of Super-tall Buildings in Shanghai
Yongjing Tang,Xihong Zhao 대한토목학회 2016 KSCE JOURNAL OF CIVIL ENGINEERING Vol.20 No.2
Although certain measurements regarding super-tall buildings constructed using the top-down method have been published, new advances in top-down construction have been developed with the construction of super-tall buildings in China. This paper presents the theory of soil-structure interactions in pile foundations and extends it to the top-down construction method. Based on this theory, the forces and the deformation of the diaphragm wall, slab and soldier piles at various stages of construction can be computed. Two typical tall buildings of 60 and 37 stories with deeply embedded 4-level and 5-level basements located in Shanghai were used as case studies of the vertical displacements of their diaphragm walls and soldier piles, the deflections of the diaphragm walls, the earth pressures, and the rebar stresses during top-down construction. The values measured in the field agree well with the predicted values from soilstructure interactions theory and statistical-empirical formulas. Two additional super-tall buildings of 101 and 121 stories, in which the 4- level and 5-level basements and the main buildings are round, are discussed regarding their unique deformational characteristics. In addition, the diaphragm wall can serve a load-sharing function. These engineering case studies, including the comprehensive predictions of deformation based on field tests and estimates using statistical formulas, can improve tall building design.
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Pore Structure of Ancient Chinese Bricks under Environmental Vicissitudes
Yongjing Tang,Zhendong Shao,Tianlong Xu 대한토목학회 2016 KSCE JOURNAL OF CIVIL ENGINEERING Vol.20 No.5
This paper studies the pore structures of ancient Chinese bricks. Two building groups consisting of seven ancient masonry buildings were examined: the Longmen Temple Group and Songyue Temple Group, both located in central China. The brick ages were examined by carbon-14 isotope measurements, the micro constituents by X-ray fluorescence experiments, and the pore structural characteristics by mercury intrusion porosimetry and saturation coefficient determination. The pore diameter rates of change were measured, calculated and analyzed. From the mercury intrusion porosimetry data, a linear relationship between the volume change of a sample and its age was determined for pores with diameters of 1-5 μm. The environmental vicissitudes caused the volumes of pores whose diameters are less than 1 μm to decrease and those of pores with diameters of 1-5 μm to increase. The change in the void volume as a function of pore size alters the material’s original porosity. Understanding the mechanics of how the pore structure of bricks changes over time sheds light on the relationship between material performance and environmental vicissitudes.
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Yongjing Tang,Suihui Wang 대한토목학회 2016 KSCE JOURNAL OF CIVIL ENGINEERING Vol.20 No.5
This paper presents a practical new approach for determining the geometric shape of an ancient pagoda structure and its axial shape along its height. Because of ancient Chinese pagodas’ unique characteristics (multiple eaves, Dougong, and vague edges), it is difficult to select appropriate measurement points. Moreover, the plane size of most ancient Chinese pagodas decreases from the bottom to the top floor. Considering these characteristics, we employed an electronic total station to monitor more than three measurement points of each wall façade of each pagoda floor, fitted plane equations using 3-D coordinates of the monitored measurement points and the least square method, calculated the corner points coordinates of each floor or cross section selected, fitted a circumscribed circle of each floor using the corner point coordinates and spatial axial equations based on the central coordinates, and performed an inclination evaluation of the ancient Chinese pagoda. This approach is practical and can be widely used in other high-rise polygonal buildings that have different plane sizes for each floor.
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