多遇地震下填充墙侧向刚度对RC框架结构抗震性能的影响
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摘要
目前,我国RC框架结构抗震设计通常采用纯框架模型:将填充墙作为非结构构件,不考虑其抗侧力作用仅将墙体重量当作外荷载加到计算模型上,通过减小结构自振周期考虑填充墙对结构整体刚度增大作用。然而,多遇地震下填充墙具有一定的抗侧刚度,在其影响下纯框架计算模型是否合理有待商榷。针对该问题,建立考虑填充墙布置的RC框架结构计算模型,并进行线性动力时程分析。对计算结果进行分析表明:当填充墙均匀布置时,从框架部分承担水平地震作用力方面考虑纯框架模型是合理的,而从框架柱轴压力方面考虑又是不合理的;当填充墙不均匀布置时,结构抗震性能的各个指标均有很大的不同,纯框架模型是不合理的。
Now,seismic design of RC frame structures in China use usually pure framework model.In the model,infill walls are considered as non-structural components,namely their lateral force does not considered,only the weight of walls as the external loads are added to the calculation model,and the structural vibration period appropriate is reduced to consider the role of overall the structure stiffness increased by wall filled.However,under small earthquake,infill walls have a certain degree of resistant lateral stiffness.In this paper,in order to discuss the justifiability of this method,linear dynamic time-history analysis of RC frame structures,considering the layout of the infill walls,are analyzed.The results show that: when infill walls uniform layout,from horizontal seismic forces of frameworks bearing angle,pure framework model is reasonable,but from pressure the frame column axis angle is unreasonable;when infill walls non-uniform layout,the pure framework model is unreasonable.
Now,seismic design of RC frame structures in China use usually pure framework model.In the model,infill walls are considered as non-structural components,namely their lateral force does not considered,only the weight of walls as the external loads are added to the calculation model,and the structural vibration period appropriate is reduced to consider the role of overall the structure stiffness increased by wall filled.However,under small earthquake,infill walls have a certain degree of resistant lateral stiffness.In this paper,in order to discuss the justifiability of this method,linear dynamic time-history analysis of RC frame structures,considering the layout of the infill walls,are analyzed.The results show that: when infill walls uniform layout,from horizontal seismic forces of frameworks bearing angle,pure framework model is reasonable,but from pressure the frame column axis angle is unreasonable;when infill walls non-uniform layout,the pure framework model is unreasonable.
引文
[1]GB50011—2010建筑抗震设计规范[S].北京:中国建筑工业出版社,2010
[2]JGJ3—2010高层建筑混凝土结构技术规程[S].北京:中国建筑工业出版社,2002
[3]王亚勇.汶川地震建筑震害启示—抗震概念设计[J].建筑结构学报,2008,29(4):20-25
[4]清华大学土木结构组,西南交通大学土木结构组,北京交通大学土木结构组.汶川地震建筑震害分析[J].建筑结构学报,2008,29(4):1-9
[5]李宏男,肖诗云,霍林生.汶川地震震害调查与启示[J].建筑结构学报,2008,29(4):10-19
[6]童岳生,钱国芳.砖填充墙钢筋混凝土框架的变形性能及承载能力[J].西安冶金建筑学院学报,1985,42(2):1-21
[7]鲍雷T,普里斯特利M J N.钢筋混凝土和砌体结构的抗震设计[M].北京:中国建筑工业出版社,2002
[8]Tucker C J.Predicting the in-plane capacity of masonryinfilled frames[D].US:Tennessee TechnologicalUniversity,2007
[2]JGJ3—2010高层建筑混凝土结构技术规程[S].北京:中国建筑工业出版社,2002
[3]王亚勇.汶川地震建筑震害启示—抗震概念设计[J].建筑结构学报,2008,29(4):20-25
[4]清华大学土木结构组,西南交通大学土木结构组,北京交通大学土木结构组.汶川地震建筑震害分析[J].建筑结构学报,2008,29(4):1-9
[5]李宏男,肖诗云,霍林生.汶川地震震害调查与启示[J].建筑结构学报,2008,29(4):10-19
[6]童岳生,钱国芳.砖填充墙钢筋混凝土框架的变形性能及承载能力[J].西安冶金建筑学院学报,1985,42(2):1-21
[7]鲍雷T,普里斯特利M J N.钢筋混凝土和砌体结构的抗震设计[M].北京:中国建筑工业出版社,2002
[8]Tucker C J.Predicting the in-plane capacity of masonryinfilled frames[D].US:Tennessee TechnologicalUniversity,2007
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