IDA-based Study On Seismic Response Under Long-period Ground Motion And Seismic Index Of Super High-rise Hybrid Structure

With the continuous development of social economy,more and more super high-rise buildings appear in people's field of vision,in which frame-corewall hybrid structure has been widely used.Based on the review of a large number of literatures,sum up the super high-rise hybrid structure seismic performance,incremental dynamic analysis?IDA?and long-period seismic impact on the structure and its definition of the status quo,this paper will be the following three aspects of research:?1?Efficiency of seismic intensity index for IDA of super high-rise hybrid structure;?2?Reasonable choice of long-period seismic waves for super high-rise hybrid structure;?3?Seismic response and law under long-period ground motion of super high-rise hybrid structure.Aiming at the above three problems,this paper takes Shenzhen Huide Building 1#building as the practical engineering example,uses PERFORM-3D elastic-plastic analysis software to build a nonlinear analysis model,and uses IDA method to carry out the following research work:?1?The elastic-plastic analysis theory of PERFORM-3D is briefly introduced.The nonlinear analysis model of the example structure is established,and the rationality of the model is checked by three aspects of modal,energy error and base shear.According to the basic principle and calculation method of IDA,the method of IDA for the example structure is determined.?2?On the basis of the existing seismic intensity index S₁₂₃and?S_a,an improved seismic intensity index?S_a%is proposed for super high-rise hybrid structure.Based on the IDA calculation results of the original site seismic wave group,the seismic intensity index?S_90%proposed in this paper can effectively reduce the discrete nature of the calculated data.Based on the results of this research,a method of time history analysis of multi-event seismic for super high-rise hybrid structure is proposed,and the validity of the method is verified.?3?According to?_lselect long-period seismic waves,medium long-period seismic waves and ordinary seismic waves each 10.A simplified method of long-hold seismic waves for IDA based on?S_90%is proposed,and it is verified that using this method can improve the efficiency of IDA calculation under the premise that the calculation error can meet the precision requirements of engineering applications.Select?_maxas a measure of structural damage,and the selection method of long-period seismic waves for super high-rise hybrid structure based on the long-period earthquake defined index?_lis proposed according to response spectrum analysis and correlation analysis between?_maxand each long-period.?4?According to IDA results of the original site seismic waves group,the ordinary seismic waves group,the medium long-period seismic waves group and the long-period seismic waves group,the example structure's response,damage and energy response under different types of seismic are studied.The seismic vulnerability analysis of the example structure is carried out based on IDA,which evalutes seismic performance of the example structure under different types of seismic based on probability.