【摘要】 与能力谱法等传统推倒分析方法相比,多模态推倒分析考虑了高阶模态对结构地震反应的影响,能更准确地评价多、高层结构的抗震性能。本文以El-Centro波为地震输入,采用多模态推倒分析方法对交错桁架多层钢结构在罕遇地震作用下的地震反应进行研究,确定结构顶点侧移、层间侧移及塑性铰分布,并与相同地震波作用下弹塑性时程分析及能力谱法分析结果进行比较。多模态推倒分析结果与弹塑性时程分析吻合较好,能准确地评价交错桁架多层钢结构的抗震性能。对层间侧移及塑性铰分布的预测,多模态推倒分析比能力谱法更为准确。更多还原

【Abstract】 Superior to conventional pushover analysis methods,such as the capacity spectrum method,modal pushover analysis takes the effects of higher modes into account and can better predict the seismic behaviour of high-rise buildings under severe earthquakes.The seismic behavior of a muti-story staggerad steel truss structure under El-Centro earthquake record was studied through modal pushover analysis method.The maximum lateral displacement,interstory drift and plastic hinge distribution thus obtained were compared with the results from nonlinear time history analysis and capacity spectrum method.The results of modal pushover analysis agreed well with those of time history analysis,proving that the seismic behaviour of multi-story staggered steel truss structures can be evaluated accurately by modal pushover analysis.The interstory drift and plastic hinge distribution from modal pushover analysis were more accurate than those from the capacity spectrum method.更多还原