不同宽度楼梯对钢筋混凝土框架结构地震反应的影响分析
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摘要
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个不包含楼梯的钢筋混凝土纯框架模型和2个包含不同宽度梯段板楼梯的钢筋混凝土框架模型,并分别采用振型分解反应谱法和底部剪力法对几种模型进行了弹性地震反应对比计算分析。结果显示:楼梯对结构的抗侧刚度大小及分布、振动模态、梯间框架柱内力分配等有明显改变,顺梯段板布置方向起到类似K形支撑作用,垂直梯段板布置方向起到类似剪力墙的作用;梯段板宽度的变化将显著改变结构在垂直于楼梯梯段方向的地震反应,而对顺梯段板方向结构地震反应改变不明显;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。
Three computer models of reinfored concrete frame structure with or without different-width staircase were made,seismic-performance of the models were calcaulated by adopting spectrum analysis and base-shear 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 K-bracing in staircase plank direction,similar to shearwall in vertical direction;Diffferent-width staircase has more effect on seimic response of frame structure in vertical to staircase plank direction,but little effect in staircase plank direction.The paper proposed that the response spectrum method should be used firstly in seismic design of reinfored concrete frame structure with staircase.
Three computer models of reinfored concrete frame structure with or without different-width staircase were made,seismic-performance of the models were calcaulated by adopting spectrum analysis and base-shear 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 K-bracing in staircase plank direction,similar to shearwall in vertical direction;Diffferent-width staircase has more effect on seimic response of frame structure in vertical to staircase plank direction,but little effect in staircase plank direction.The paper proposed that the response spectrum method should be used firstly in seismic design of reinfored concrete frame structure with staircase.
引文
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[4]GB50011-2001,建筑抗震设计规范(2008版)[S].GB50011-2001,Code for Seismic Design of Buildings(2008)[S].(in Chinese)
[5]曹万林,庞国新,李云霄.带楼梯框架弹性层刚度的试验研究[J].世界地震工程,1996,5(2):29~32.CAO Wan-lin,PANG Guo-xin,LI Yun-xiao.The Test-research on Elastic Floor Rigidity of Frame with Staircase[J]World In-formation on Earthquake Engineering,1996,5(2):29~32.(in Chinese)
[6]曹万林,庞国新,李云霄.带楼梯框架弹塑性工作性能研究[J].世界地震工程,1996,8(3):52~56.CAO Wan-lin,PANG Guo-xin,LI Yun-xiao.On Elasto-plastic Performance of Frame with Staircase[J].World Information onEarthquake Engineering,1996,8(3):52~56.(in Chinese)
[7]曹万林,胡国振.钢筋混凝土框架与楼梯共同工作性能试验研究[J].工程力学,1999,(增刊):23~26.CAO Wan-lin,HU Guo-zhen.The Test-research on Performance of Frame with Staircase[J].Engineering Mechanics,1999,(Supplement):23~26.(in Chinese)
[8]JGJ3-2002,高层建筑混凝土结构技术规程[S].JGJ3-2002,Technical Specification for Concrete Structures of Tall Building[S].(in Chinese)
[9][美]爱德华.L.威尔逊.结构静力与动力分析[M].中国建筑工业出版社,2006.Wilson,Edward L.Static and Dynamic Analysis of Structures[M].China Architecture and Building Press,2006.(in Chi-nese)
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