不同梯段板厚度楼梯对钢筋混凝土框架结构地震反应影响分析
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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.
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.
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.
引文
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[14]申跃奎,张涛,王威.框架结构楼梯的震害分析与设计对策[J].建筑结构,2009(11):72-74.
[15]焦柯,吴文勇,黄真康,等.楼梯参与结构整体工作的计算分析[J].广东土木与建筑,2009(3):3-6.
[16]代红军,祁皑.基于ETABS的钢筋混凝土框架与楼梯共同工作性能分析[J].地震工程与工程振动,2009,29(6):36-42.
[17]代红军,祁皑.不同宽度楼梯对钢筋混凝土框架结构地震反应影响分析[J].西南科技大学学报,2009,24(4):48-55.
[18]代红军,祁皑.考虑楼梯影响的钢筋混凝土框架结构地震反应分析[J].福州大学学报:自然科学版,2010,38(2):259-265.
[19]杨溥,李英民,赖明.结构时程分析法输入地震波的选择控制指标[J].土木工程学报,2000,33(6):33-37.
[2]郗蒙浩,赵秋红,王公学.地震应急避险问题研究[J].自然灾害学报,2009(5):70-74.
[3]韩军,李英民,刘立平,等.5.12汶川地震绵阳市区房屋震害统计与分析[J].重庆建筑大学学报,2008(5):21-27.
[4]田志鹏,张新培,赵统.汶川地震中多层钢筋混凝土框架结构房屋震害分析[J].建筑结构,2009(11):67-71.
[5]张敏政.从汶川地震看抗震设防和抗震设计土[J].木工程学报,2009(5):21-24.
[6]GB50011-2001建筑抗震设计规范(2008版)[S].
[7]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(2):29-32.
[8]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(3):52-56.
[9]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,1999,2(S2):23-26.
[10]Sang B K,Young H L,Andrew S,et al.Experimental assessment of vibration serviceability of stair systems[J].Journal ofConstructional Steel Research,2008,64(2):253-259.
[11]Halil S,Ramazan A,Adem D,et al.Dynamic analysis and seismic performance of reinforced concrete minarets[J].Engi-neering Structures,2008,30(8):2 253-2 264.
[12]Zhao B,Tancor F,Ressetto T.Field investigation on the performance of building structures during the 12 May 2008 Wenchuanearthquake in China[J].Engineering Structures,2009,31(8):1 707-1 723.
[13]张望喜,易伟建,肖岩,等.“5.12”汶川地震灾区典型教学楼框架与楼梯共同工作性能[J].建筑科学与工程学报,2009,26(2):38-45.
[14]申跃奎,张涛,王威.框架结构楼梯的震害分析与设计对策[J].建筑结构,2009(11):72-74.
[15]焦柯,吴文勇,黄真康,等.楼梯参与结构整体工作的计算分析[J].广东土木与建筑,2009(3):3-6.
[16]代红军,祁皑.基于ETABS的钢筋混凝土框架与楼梯共同工作性能分析[J].地震工程与工程振动,2009,29(6):36-42.
[17]代红军,祁皑.不同宽度楼梯对钢筋混凝土框架结构地震反应影响分析[J].西南科技大学学报,2009,24(4):48-55.
[18]代红军,祁皑.考虑楼梯影响的钢筋混凝土框架结构地震反应分析[J].福州大学学报:自然科学版,2010,38(2):259-265.
[19]杨溥,李英民,赖明.结构时程分析法输入地震波的选择控制指标[J].土木工程学报,2000,33(6):33-37.
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