双向地震下刚度偏心体系的弹塑性反应谱研究
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摘要
针对实际地震动的多维性、偏心引起结构多分量反应的耦合作用以及结构非线性的空间耦合特性,建立了可考虑刚度偏心影响的单层体系弹塑性等延性拟强度折减系数谱。根据对硬、中、软三类场地60条地震动记录进行时程计算的结果,分析了不同场地类型、相对偏心距、扭转频率比等因素对拟强度折减系数谱的影响,为进一步建立可应用于工程实际的多维弹塑性设计反应谱奠定基础。
The strength reduction factor spectra of constant ductility factors for one–storey asymmetric plan system is presented considering the characters of multi-dimensional response of structures,torsion coupling response of structures and nonlinear spatial coupling of structural multi-components.The effects of normalized stiffness eccentricity,rotation frequency ratio for spectra amplitude on strength reduction factors are discussed based on statistic analysis of 60 recordings in two directions for hard site,medium site and soft site,which is the base for further forming the inelastic design response spectra of asymmetric systems in engineering application.
The strength reduction factor spectra of constant ductility factors for one–storey asymmetric plan system is presented considering the characters of multi-dimensional response of structures,torsion coupling response of structures and nonlinear spatial coupling of structural multi-components.The effects of normalized stiffness eccentricity,rotation frequency ratio for spectra amplitude on strength reduction factors are discussed based on statistic analysis of 60 recordings in two directions for hard site,medium site and soft site,which is the base for further forming the inelastic design response spectra of asymmetric systems in engineering application.
引文
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[3]徐福江,钱稼茹.常延性系数弹塑性位移谱及其应用[J].工程力学,2007,24(6):15-20.
[4]翟长海.钢筋混凝土规则框架结构非弹性位移比谱研究[J].工程力学,2009,26(9):80-86.
[5]李宏男.地震动的转动分量及有关的结构反应分析[J].世界地震工程,1991,(4):44-51.
[6]周晓松,裴星洙,廖述清.单层偏心结构平扭耦合地震反应分析[J].工程建设与设计,2005(3):56-60.
[7]李宏男.结构多维抗震理论[M].北京:科学出版社,2006.
[8]RAFAEL R,HERNAN S M.Inelastic response of one-storey asymmetric-plan systems subjected to bi-direc-tional earthquake motions[J].Earthquake Engineeringand Structural Dynamics,1999,28:273-285.
[9]王东升,李宏男,王国新.双向地震动作用的拟等延性系数谱[J].地震工程与工程振动,2004,24(4):25-31.
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[11]王丰,李宏男.双向地震动作用下刚度偏心单层体系弹性反应谱研究[J].振动与冲击,2007,26(6):4-9.
[12]包世华,方鄂华.高层建筑结构设计[M].北京:清华大学出版社,1998.
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