地震作用下框架楼梯参与结构整体工作的研究
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摘要
以地震区典型办公楼框架为对象,研究了框架与楼梯的共同工作性能。利用大型结构软件Midas设计了考虑楼梯与不考虑楼梯的2个钢筋混凝土框架结构模型,分别采用振型分解反应谱法和时程分析法对2个模型进行了弹性地震反应对比计算分析。结果表明,考虑楼梯后结构的自振特性、结构抗侧刚度、地震作用下楼梯构件的受力状态发生明显的变化;框架结构中楼梯及其周边构件将承担更多地震力,是结构设计应加强的部位。楼梯的空间刚度效应对整体结构抗震性能影响较大。所得结论可为实际工程设计应用提供参考。
Taking the typical office building in the earthquake area,the interaction performance between frames and stairs was explored.Two models of reinforced concrete frame structure with or without staircases are made by using Midas,and the comparison and calculation of the elastic seismic-performance are analyzed by adopting the spectrum analysis and time history analysis method based on MIDAS.The results show that obvious differences are found in the characteristic of structural free vibration,structural lateral stiffness and the internal force condi tion of the stair element.More earthquake forces may be distributed to the component of stairs and other mem bers around it,which should be strengthened in the structure design.The spatial stiffness effect of the stair great ly affects the structural seismic performance.The result can be of some help in the practical engineering design and application.
Taking the typical office building in the earthquake area,the interaction performance between frames and stairs was explored.Two models of reinforced concrete frame structure with or without staircases are made by using Midas,and the comparison and calculation of the elastic seismic-performance are analyzed by adopting the spectrum analysis and time history analysis method based on MIDAS.The results show that obvious differences are found in the characteristic of structural free vibration,structural lateral stiffness and the internal force condi tion of the stair element.More earthquake forces may be distributed to the component of stairs and other mem bers around it,which should be strengthened in the structure design.The spatial stiffness effect of the stair great ly affects the structural seismic performance.The result can be of some help in the practical engineering design and application.
引文
[1]任彧.楼梯系统对于框架抗震性能的影响[J].福建建筑,2009,129(3):42-44.
[2]武俊杰,梁伟杰.结构楼梯间与楼梯的震害分析及设计建议[J].山西建筑,2010(7):42-43.
[3]王国弢.楼梯间处短柱对结构抗震性能的影响[D].成都:西南交通大学,2008.
[4]张立.高层建筑结构地震响应的时程分析法[M].北京:中国水利水电出版社,2006.
[2]武俊杰,梁伟杰.结构楼梯间与楼梯的震害分析及设计建议[J].山西建筑,2010(7):42-43.
[3]王国弢.楼梯间处短柱对结构抗震性能的影响[D].成都:西南交通大学,2008.
[4]张立.高层建筑结构地震响应的时程分析法[M].北京:中国水利水电出版社,2006.
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