【摘要】 考虑结构在地震作用下不同反应阶段的动力特性,采用振型反应谱法,建立结构在不同地震作用水平下的弹塑性需求曲线族,即结构的层间剪力-位移需求曲线。结合结构的能力曲线,提出以楼层为研究对象的层间能力谱法。由结构的性能目标与位移延性的关系,建立性能目标与层间需求曲线的关系,从而得到考虑结构延性的层间需求曲线。通过计算分析表明,层间能力谱法可以有效的用于对竖向不规则结构进行基于性能的抗震设计,可以方便地对不同地震作用水平、不同性能目标的结构进行地震作用计算和配筋计算,并能控制结构在不同地震作用下的变形性能、塑性铰出现顺序及部位,与时程分析方法相比偏于保守,且比直接基于位移的设计方法具有明显的优势。更多还原

【Abstract】 Considering the dynamic characteristics of structures under different earthquake hazard level,s inelastic demand curves, namely, inter-story shear versus inter-story displacement curve are established by using mode spectrum method. Based on the relationship between structure performance objective and displacement ductibility, the relationship between structure performance objective and inter-story demand curve is obtained. The inter-story demand curves adequately take into account of the inelastic behavior of structures under earthquake action. Then considering the capacity cure of the structure, a new method, named inter-story capacity spectrum method, is put forward for the performance based seismic design of vertically irregular frame structures. Examples are presented to demonstrate the applicability and utility of the proposed method. It is concluded that the new method can control the inter-story drift, the order and the position of hinges of vertically irregular structures under different earthquake hazard levels. Comparing with time history analysis method, the proposed method is more conservative and is superior to direct displacement-based design(DDBD)method.更多还原