土-偏心结构相互作用平扭耦联反应参数分析
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摘要
建立了一种土-偏心结构相互作用简化模型,研究了考虑土-结构相互作用因素后结构平扭耦联反应。采用拉格朗日能量法推导了结构的运动方程,并结合算例,用振型分解法对结构的平扭耦联反应进行了分析,讨论了扭平频率比、偏心率和土-结构相互作用影响系数对结构平扭耦联反应的影响。计算结果表明,土-偏心结构相互作用体系与刚性地基上结构有明显差别,且随着地基土的变软,这些差别更为明显。
A model for soil-asymmetric structure interaction system is established to study the lateral-torsional coupling response.The characteristic equation is given as the result of the application of the Langange energy equation,and lateral-torsional coupling response in practical structure is studied by modal analysis method.The effect of torsional-lateral frequency ratio,asymmetric ratio and soil-structure interaction affecting parameter on the lateral-torsional coupling response are discussed.The results show that the difference between a soil-asymmetric structure interaction system and a rigid base structure is evident.The softer the soil is,the more evident the difference is.
A model for soil-asymmetric structure interaction system is established to study the lateral-torsional coupling response.The characteristic equation is given as the result of the application of the Langange energy equation,and lateral-torsional coupling response in practical structure is studied by modal analysis method.The effect of torsional-lateral frequency ratio,asymmetric ratio and soil-structure interaction affecting parameter on the lateral-torsional coupling response are discussed.The results show that the difference between a soil-asymmetric structure interaction system and a rigid base structure is evident.The softer the soil is,the more evident the difference is.
引文
[1]霍毅.土-偏心结构相互作用地震反应的参数分析[D].天津:天津大学,2006.
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[5]姜忻良,郑希明.地基-非线性结构体系空间效应的主共振[J].天津大学学报,2005,38(9):800—805.
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[10]李宏男,等.多维地震作用非对称结构扭转耦联随机反应分析[J].建筑结构学报,1992,13(6):12—20.
[2]王耀伟.平面不规则结构非弹性地震反应规律研究[D].重庆:重庆大学,2003.
[3]Dela Llera J D,Chopra A K.Understanding the inelas-tic seismic behaviour of asymmetric-plan buildings[J].Earthquake Engineering and Structural Dynamics,1995,24(2):549—572.
[4]姜忻良,赵慧芳.结构-地基相互作用水平与扭转的超亚谐振动[J].振动工程学报,2006,19(2):265—269.
[5]姜忻良,郑希明.地基-非线性结构体系空间效应的主共振[J].天津大学学报,2005,38(9):800—805.
[6]李小军,廖振鹏,张克绪.土体动力本构模型评述[J].世界地震工程,1993,9(4):15—18.
[7]王松涛,曹资.现代抗震设计方法[M].北京:中国建筑工业出版社,1997.
[8]建筑抗震设计规范[S](GB50011-2001).北京:中国建筑工业出版社,2001.
[9]吴香香,李宏男.结构偏心对基础隔震结构地震反应的影响[J].地震工程与工程振动,2003,23(1):145—151.
[10]李宏男,等.多维地震作用非对称结构扭转耦联随机反应分析[J].建筑结构学报,1992,13(6):12—20.
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