| In recent years, a large number of skyscrapers have been constructed and newbuilding height records have been broken from time to time as a result of the greatimprovement and development of construction techniques and materials. Most of thestructural systems of these high-rise buildings adopt the hybrid structures ofperipheral frame and concrete core-tube. The increase of building height also bringssome new technical difficulties for the structural design and construction. Thestiffness and ways of loading are so constantly changing during the entireconstruction process that will cause the redistributions of structural internal forces.Moreover, these factors such as the loading age, shrinkage and creep of concrete willalso lead to the differences of the vertical deformation between external frame andcore tube. The redistributions of internal forces and vertical differential deformationmust be taken into account because they will seriously affect the safety of the buildingduring construction.This thesis is concerned with the construction project of a super high-risebuilding, Ping-An Finance Centre in Shenzhen. It contains studies of the entireconstruction simulation analysis, structural internal force and vertical deformationbetween structural members as well as the preliminary study regarding the dynamiccharacteristics of the tower.During the numerical simulation, the Midas model and sub-models of theShenzhen Ping-An Finance Centre have been established. And the entire constructionsimulation analysis is then conducted, which has a particular focus on the shrinkageand creep of concrete members during each construction step. It investigates thedevelopment of maximum reaction force, axial force and stress/strain of the pilefoundation during the construction process. Then it gives the stress evolution ofcritical nodes and components in the upper structures. At last, it summarizes the lawand the distribution characteristics of vertical deformation along the height of thetower.The key technologies for the construction monitoring of the super high-risebuilding are discussed at first, including sensor selection, layout of monitoring points,data acquisition and processing, etc. The data of retaining structural deformation monitored at field are analyzed, focusing on the variation in the horizontaldisplacements of the retaining structure with excavation depth of foundation pit.Meanwhile, according to the monitoring data of surface subsidence, the change in thesurface subsidence induced by the excavation of foundation pit is analyzed. Thechange of soil pressure of the pile foundation, the stress change of the monitoringsites in the1st and11th floor as well as the vertical deformation of structure are alsoanalyzed by combining the monitoring data of pile foundation and critical part ofupper structure. Moreover, all data from the field testing and numerical simulation arecompared and analyzed. It is found that the results from the numerical simulation andfield measurements are generally in good agreement although the maximum ofdiscrepancy is about14%.The structural dynamic characteristics of Ping-An Finance Centre in Shenzhenhave been investigated in the last chapter of this thesis. The first11-order vibrationmode shapes and movement patterns are studied by using the modal analysis method.Then, the EL Centro (E-h) earthquake wave has been selected and input into the basefrom the two major axis of the building to carry out the structural time-historyanalysis. The time history responses of displacement and accelerations of the tower,the shear force and overturning moment are presented.The practical monitoring exercise described in this thesis provides the designer,the contractor, the client and the public valuable data regarding the safety of the tower.It also verifies the effectiveness and importance of the construction monitoring forsuch a complex super-tall structure. |
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