【摘要】 为实现多自由度结构的随机地震响应可靠度分析。基于模态Pushover分析,得到各阶模态对应的荷载-位移曲线,进而建立各阶模态对应单自由度恢复力模型。结合我国现行《建筑抗震设计规范(GB50011-2010)》,确定随机地震动模型及参数,进行各阶模态对应的等效单自由度随机地震响应分析。基于模态Pushover基本理论,将多自由度结构分析转化为等效单自由度随机地震响应组合,得到结构整体随机地震响应。并通过实际算例表明本文方法的分析过程和计算精度。本方法可较方便地进行结构抗震可靠度评估,研究成果对多自由度结构抗震随机分析和Pushover发展具有实际意义。更多还原

【Abstract】 The objective of this paper is the establishment of reliability analysis of MDOF structure under random earthquake response. The load-displacement curve of each mode was obtained by model pushover analysis,and the model of single degree restoring force was given. Subsequently,the model and coefficients of stochastic seismic were defined by the Chinese seismic design code( GB50011-2010),and also the equivalent single degree of each mode. Hence,the analysis of MDOF structure was transformed to combination of equivalent SDOF structure,so as to provide the stochastic seismic response of the whole structure. The numeral example shows that the method presented by the paper can make the assessment of structure safety effectively. the research has practical significance to stochastic seismic analysis of MDOF structure and model pushover analysis.更多还原