【摘要】 建筑结构的常规抗震设计,是按多遇地震作用对结构进行承载力及弹性侧移计算。为了保证结构的抗震性能,须验算结构在设防地震及罕遇地震作用下的承载力及弹塑性侧移。本文采用振型分解反应谱法,其中等效单自由度体系采用强化弹塑性模型,模型主要参数由常规抗震设计确定,屈服后刚度及阻尼比按模型强化段进行调整,利用规范的地震反应谱,进行结构的弹塑性反应分析。二层钢筋混凝土框架结构算例计算结果表明,采用本文提出的设计谱方法与弹塑性时程分析方法的计算结果基本相当,而计算则大为简化。按本文方法所得设防地震及罕遇地震作用下的结构地震响应可用于结构承载力验算,所得侧移可用于结构侧移控制及变形能力设计。更多还原

【Abstract】 In the conventional seismic design of structures,the strength and elastic deflection are calculated according to frequent earthquakes.In order to ensure the structural seismic performance,the strength and elasto-plastic deflection must also be checked according to the design level earthquake and rare earthquake.Mode-superposition response spectrum method was adopted in this paper.The strengthened elasto-plastic model was used in ESDOF system.The main characteristic values of the model were determined from the conventional seismic design.The post-yield stiffness and damping ratio were modified along the hardened segment of model.The earthquake responses of structure were calculated with the response spectrum of the code.The example analysis of a two-story RC frame shows that the results obtained by the design spectrum method and the elasto-plastic time-history analysis are similar,but the computational process is greatly reduced for the former method.The design level earthquake and rare earthquake actions obtained by the proposed method may be used for checking the structural strength,and the corresponding deflection may be used to control structural deflection and for deformation capacity design.更多还原