The Performance Analysis Of High-rise Frame-shear Wall Base-isolated Structure

The base-isolation is a new type of technique. The isolation system, which has a small horizontal stiffness and a large deformation, is placed between superstructure and its foundation, The purpose of it is to prevent the seismic energy from transmitting to the superstructure, prolong the natural period of structure and reduce the seismic response to improve safety of the structure. Along with the development of the research and the need of practical engineering, the isolation technique is being applied to high-rise building gradually. Therefore, studying on the seismic response of this kind of isolation structure is import to protect people’s life safety. This thesis used theoretical analysis, simulated methods, references and practical engineering to do research on Frame-shear Wall base-isolated structure:(1) Changed rule of the seismic response in the Duo and Han case;(2) The comparison of the seismic response in the Duo and Han case.Firstly, this thesis introduced based-isolated system briefly, according to the mechanism of the isolated structure analyzed the mechanical modal and solving equations of the seismic response in the based-isolated system, and then described the mechanical properties and restoring force modal of the isolation bearings; Secondly, the large-scale structural finite element analysis software SAP2000was used to make a dynamic time-history analysis of Frame-shear Wall structure with using the base isolation of Shock7degrees in the Duo and Han case. And then we made a comparative study of the calculation results with the traditional anti-seismic High-rise frame-shear Wall structure to evaluate the isolation structure between the damping effect and the damping law. Meanwhile, we made contrast of the seismic response in the Duo and Han case. Lastly, the loading condition of the isolation bearings and derived height-width ratio were analyzed in order to avoid the overall overturning of the structure.In this thesis, the main contents are drew as follows by making a dynamic time-history analysis in the Duo and Han case of High-rise Frame-shear Wall base-isolated structure:(1) There is certain isolation effect in the two cases, but the isolation effect is more apparent in the Han case, so it can greatly reduce seismic measures of superstructure;(2) The shape of time-history curve of the top floor’s acceleration response is similar with the input earthquake wave’s, but which is different to the base shear and the largest story displacements;(3) The shape of time-history curve of the top floor’s acceleration response of Frame-shear Wall structure is similar with the isolated structure s, but the time-history curves of the base shear and the largest displacement of these two structures are certainly different.