大震下中间层隔震体系的随机动力可靠性分析
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摘要
建立了中间层隔震结构的非线性动力分析模型.用刚度退化Bouc-Wen模型描述钢筋混凝土框架的滞变恢复力;用非退化Bouc-Wen模型描述隔震层的恢复力.采用虚拟激励法计算结构的非平稳随机地震响应,在Poisson交叉过程假设下,求得了结构体系基于位移首超破坏准则的动力可靠度,并以实际工程为背景,分析了隔震层参数对中间层隔震结构的体系可靠度的影响.结果表明:采用中间层隔震技术后,隔震层上部结构的地震力水平较原结构降低了一度,且下部结构的动力可靠度也较不隔震时有所提高,合理的隔震层刚度和适当的隔震层阻尼可以明显降低中间层隔震结构在大震下整体倒塌的概率.
A non-linear dynamic analysis model of mid-story isolation structure was proposed,in which the Bouc-Wen model was adopted to represent the hysteretic restoring force of isolator,and the stiffness degrading Bouc-Wen model was used for the reinforced concrete frame.The pseudo excitation method was employed to calculate the non-stationary random seismic responses of the structure.Under the Poisson hypothesis,the dynamic reliability of the structure based on the first passage failure criteria was calculated,and the influence of isolator parameters on the system reliability of the mid-story isolation was analyzed.The results have indicated that the seismic effect level of the structure above the isolation level can be lowered by one degree,and the dynamic reliability of substructure will be increased when the mid-story isolation technique is introduced.The collapse failure probability can also be greatly reduced with reasonable isolation stiffness and appropriate isolation damping.
A non-linear dynamic analysis model of mid-story isolation structure was proposed,in which the Bouc-Wen model was adopted to represent the hysteretic restoring force of isolator,and the stiffness degrading Bouc-Wen model was used for the reinforced concrete frame.The pseudo excitation method was employed to calculate the non-stationary random seismic responses of the structure.Under the Poisson hypothesis,the dynamic reliability of the structure based on the first passage failure criteria was calculated,and the influence of isolator parameters on the system reliability of the mid-story isolation was analyzed.The results have indicated that the seismic effect level of the structure above the isolation level can be lowered by one degree,and the dynamic reliability of substructure will be increased when the mid-story isolation technique is introduced.The collapse failure probability can also be greatly reduced with reasonable isolation stiffness and appropriate isolation damping.
引文
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[10]CLOUGH R W,PENZIEN J.Dynamics of structures[M].New York:McGraw-Hill,1975.
[2]SPENCER JR B F,SAIN M K,KANOR J C.Probabilistic stabilitymeasures for controlled structures subject to the real parameter uncer-tainties[J].Smart Materials and Structures,1992,1(2):294-305.
[3]PRADLWARTER H J,SEHUELLER G I,DORKA U.Reliability ofMDOF-systems with hysteretic devices[J].Engineering Structures,1998,20(8):685-691.
[4]MARANO G C.Probability seismic response and reliability assessmentof isolated bridges[J].Earthquake Engineering and Engineering Vibra-tion,2005,4(1):95-106.
[5]杜永峰,李慧,金德保,等.大震下被动与智能隔震结构的动力可靠度的对比[J].地震工程与工程振动,2006,26(4):212-219.DU Y F,LI H,JIN D B,et al.Comparison of seismic reliability ofpassive and smart isolated structures under major earthquakes[J].Earthquake Engineering and Engineering Vibration,2006,26(4):212-219.(In Chinese)
[6]谭平,闫维明,周福霖.大平台多塔楼新型隔震体系的智能磁流变控制[J].工程抗震与加固改造,2007,29(3):41-47.TAN P,YAN W M,ZHOU F L.Smat control for a new seismic isola-tion system of multi-tower structure on a large platform using MR damp-ers[J].Earthquake Resistant Engineering and Retrofitting,2007,29(3):41-47.(In Chinese)
[7]欧进萍,王光远.结构随机振动[M].北京:高等教育出版社,1998.OU J P,WANG G Y.Random vibration of structures[M].Beijing:Higher Education Press,1998.(In Chinese)
[8]LIN J H,SHEN W P,WILLIAMS F W.A high precision direct inte-gration scheme for structures subjected to transient dynamic loading[J].Computers&Structures,1995,56(1):113-120.
[9]王光远,朱靖华.地震作用下串、并联工程系统中结构失效相关性的近似处理[J].地震工程与工程振动,1998,18(4):1-7.WANG G Y,ZHU J H.Approximate method dealing with failure de-pendence among structures in disaster-resistant engineering system[J].Earthquake Resistant Engineering and Retrofitting,1998,18(4):1-7.(In Chinese)
[10]CLOUGH R W,PENZIEN J.Dynamics of structures[M].New York:McGraw-Hill,1975.
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