考虑楼梯影响的钢筋混凝土框架结构地震反应分析

为研究楼梯对结构地震反应的影响,利用大型结构软件ETABS设计了1个不含楼梯的钢筋混凝土框架模型和2个包含楼梯的钢筋混凝土框架模型,分别采用振型分解反应谱法和底部剪力法对3个模型进行了弹性地震反应对比计算分析.结果表明,楼梯明显改变了结构的抗侧刚度分布、振动模态及梯间框架柱内力分配比例等,其影响因楼梯中间平台与梯间框架柱是否相连而异.模型3是一种可行的方式,建议设计时采用振型分解反应谱法对包含楼梯结构进行抗震分析计算.

Analysis on seismic-response of reinforced concrete frame structure with staircase

Three computer models of reinfored concrete frame structure with or without staircase are made,seismic-performance of the models are calcaulated by adopting spectrum analysis and baseshear method based on ETABS. The results show that including staircase into models will change the story-stiffness distribution,vibration mode,shear-ratio of staircase-frame column of frame structure significantly,the effects are different depenning on mid-platform connecting to staircase-frame column or not; The paper propose ...