Analysis On Seismic Vulnerability Of Timber Structure Of Guangyue Tower

As the carrier of Chinese traditional culture,ancient buildings have important architectural,artistic and technical values.In the course of the evolution of history,the timber structure of ancient buildings in China has undergone natural disasters and man-made damages,and its structural performance has been degraded continuously.Therefore,it is of great theoretical significance and practical engineering value to carry out the analysis and research on the vulnerability of ancient wooden structures,to evaluate their seismic performance,and to reinforce and repair them.Based on the performance-based seismic engineering（PBEE）theory,this paper studies the vulnerability of the timber structure of Guangyue Tower in Liao Cheng.The main research contents of this paper are as follows:（1）Based on ANSYS finite element analysis software,the finite element models of Guangyue Tower wooden structure and the whole structure were established respectively,and the modal analysis of the finite element model was carried out.The obtained natural vibration frequency was compared with the field measured frequency to verify the rationality of the finite element model.（2）Using incremental dynamic analysis（IDA）,the finite element model of dccement dynamic time history analysis of structural damage parameter(interlayer displacement Angleθ_max)with different intensity of ground motion parameters（S_a,PGA,PGV）relationship,through the quantile statistics analysis,the PGA as strength parameters can improve the effectiveness of the dccement seismic performance evaluation.（3）Based on S_aand PGA seismic strength parameters,the seismic vulnerability of Guangyue Tower was analyzed.The transcendence probability of each limit state was calculated,and the vulnerability curve of Guangyue Tower under different seismic strength parameters was obtained.The analysis shows that the seismic performance of Guangyue Tower is good and the seismic capacity is abundant,which exceeds the seismic fortification requirement of"big earthquake can not fall down".At the same time,the effectiveness of evaluating the seismic performance of Guangyue Tower by PGA as a seismic intensity parameter is verified from the probability level.（4）The paper makes a comparative analysis of the wooden structure of Guangyue Tower and the overall structure of the foundation considering the height.The high base amplifies the seismic response of the wooden structure;In each limit failure state,the damage degree and surmount probability of the whole structure are higher than that of the superstructure.