The gravity second-order effect of high-rise structures has significant impact on its stability.A global limit state equation of stability based on the equivalent stiffness-to-weight ratio degradation rate was set up,global seismic reliability analysis method based on stochastic response surface method was proposed.Taking the frame-core tube structure as an example,the seismic reliability analysis of the limit state of the overall stability capacity was carried out,and the results were compared with the seismic reliability analysis results of the deformation capacity adapted to the current design specifications.The results show that the global seismic reliability index of stability capacity can effectively evaluate the structural seismic reliability,and has good consistency with the seismic reliability index of deformation capacity.Considering the randomness of material strength and earthquake action,the proposed method can be applied to the comparison of structural design schemes for high-rise structures,the reliability assessment of existing high-rise structures,and the evaluation of the effectiveness of retrofitting schemes.
关键词
高层结构/抗震可靠度/稳定能力极限状态/等效刚重比退化率/变形能力极限状态/随机响应面法
Key words
high-rise structure/seismic reliability/limit state of stability/equivalent stiffness-to-weight ratio degradation rate/limit state of deformation/stochastic response surface method
维普
万方数据