【摘要】 为研究楼梯对结构地震反应的影响,利用有限元软件ETABS建立了1个不包含楼梯的钢筋混凝土框架模型和2个包含不同梯段板厚度楼梯的钢筋混凝土框架模型(梯-框脱离模型),分别采用振型分解反应谱法和时程分析法对3个模型进行了地震反应对比计算分析.结果显示:考虑楼梯参与结构整体地震计算后,结构的振动模态、抗侧刚度分布、及梯间框架柱内力分配比例等明显改变,楼梯在顺梯段板布置方向起到类似支撑作用,垂直梯段板布置方向起到类似剪力墙的作用;梯段板厚度的变化对结构在垂直于楼梯梯段方向和顺梯段板布置方向的地震反应改变程度虽略有不同,但总体上结构整体地震反应改变都不算显著;设计时建议采用振型分解反应谱法对包含楼梯结构进行整体抗震计算分析,对时程分析数据应合理分析应用,不可简单平均.更多还原

【Abstract】 Three computer models of reinfored concrete frame structure are made,one without staircase,two with different-thickness staircase mid-platform disconnecting to staircase-frame column.seismic-response of the models are calcaulated by adopting spectrum analysis and time history analysis 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 role of staircase is similar to bracing in staircase plank direction,similar to shearwall in vertical direction.Diffferent-thickness staircase has slight difference on seimic response of frame structure in two directions,but the difference is small.The paper propose that the response spectrum method should be used firstly in seismic design of reinfored concrete frame structure with staircase,the data of time history analysis should be analysed deeply before adopted.更多还原