近断层地震作用下隔震结构基底碰撞响应分析及倾覆倒塌模拟
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摘要
近断层脉冲型地震作用下,建筑的隔震层会产生较大的侧移,与周边基坑挡墙可能发生碰撞。采用非线性弹簧来模拟基坑挡墙,考虑上部结构的弹塑性变形。利用基于非线性弹簧的碰撞模型,分析了近场、远场地震作用下隔震结构的碰撞响应,探讨了隔震结构与周边基坑的预留间距对隔震结构碰撞的影响。并通过二次开发,采用生死单元法,模拟了碰撞导致隔震结构的倾覆倒塌。基于增量动力分析(IDA)的分析结果表明:近场地震作用下隔震结构更容易发生碰撞,对隔震结构的倾覆效应更具相关性,碰撞导致隔震支座产生受拉破坏继而发生倾覆倒塌。
The isolation story will have a greater deformation,potential pounding may occur at the isolation level between the building and its surrounding retaining walls under the near-fault pulse-type seismic motion.Non-linear springs were employed to simulate the impact of the boundary,and elastic-plastic deformation of the upper structure was also considered.The pounding response of the isolation structure under near-fault and far-fault seismic and the impacts of the pounding under different tectonic space were studied by the collision model based on non-linear springs.Through "birth-death" element defined in the user's subroutine,collapse leaded by pounding was simulated.The Incremental Dynamic Analysis(IDA) result shows that structures under near-fault seismic are more likely to crash compared with far-fault seismic,and it is more relevant with overturning of isolation structure.Simulation results show that pounding lead to isolation bearing damage and subsequent overturning collapsed.
The isolation story will have a greater deformation,potential pounding may occur at the isolation level between the building and its surrounding retaining walls under the near-fault pulse-type seismic motion.Non-linear springs were employed to simulate the impact of the boundary,and elastic-plastic deformation of the upper structure was also considered.The pounding response of the isolation structure under near-fault and far-fault seismic and the impacts of the pounding under different tectonic space were studied by the collision model based on non-linear springs.Through "birth-death" element defined in the user's subroutine,collapse leaded by pounding was simulated.The Incremental Dynamic Analysis(IDA) result shows that structures under near-fault seismic are more likely to crash compared with far-fault seismic,and it is more relevant with overturning of isolation structure.Simulation results show that pounding lead to isolation bearing damage and subsequent overturning collapsed.
引文
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[2]TSAI H C.Dynamic analysis of base-isolated shear beamsbumping against stops[J].Earthquake Engineering&Structural Dynamics,1997,26(5):515-528.
[3]叶昆,李黎.LRB基础隔震结构在近断层脉冲型地震作用下的动力响应研究[J].工程抗震与加固改造,2009,31(2):32-39.
[4]叶昆,李黎.改进的Kelvin碰撞分析模型[J].工程力学,2009,26(SⅡ):245-248.
[5]叶献国,谢一可,李康宁.基础隔震结构在侧向碰撞下的地震反应分析[J].地震工程与工程振动,2008,28(4):161-167.
[6]符蓉,叶昆,李黎.LRB基础隔震结构在近断层脉冲型地震作用下的碰撞响应[J].工程力学,2010,27(SⅡ):298-302.
[7]樊剑,刘铁,魏俊杰.近断层地震下摩擦型隔震结构与限位装置碰撞反应及防护措施研究[J].土木工程学报,2007,40(5):10-16.
[8]叶昆,李黎.近断层脉冲地震作用下偏心基础隔震结构的地震反应研究[J].工程力学,2009,26(7):163-169.
[9]杜永峰,李慧.双向地震激励下隔震结构抗倾覆特性的数值分析[J].计算机辅助工程,2011,20(1):42-46.
[2]TSAI H C.Dynamic analysis of base-isolated shear beamsbumping against stops[J].Earthquake Engineering&Structural Dynamics,1997,26(5):515-528.
[3]叶昆,李黎.LRB基础隔震结构在近断层脉冲型地震作用下的动力响应研究[J].工程抗震与加固改造,2009,31(2):32-39.
[4]叶昆,李黎.改进的Kelvin碰撞分析模型[J].工程力学,2009,26(SⅡ):245-248.
[5]叶献国,谢一可,李康宁.基础隔震结构在侧向碰撞下的地震反应分析[J].地震工程与工程振动,2008,28(4):161-167.
[6]符蓉,叶昆,李黎.LRB基础隔震结构在近断层脉冲型地震作用下的碰撞响应[J].工程力学,2010,27(SⅡ):298-302.
[7]樊剑,刘铁,魏俊杰.近断层地震下摩擦型隔震结构与限位装置碰撞反应及防护措施研究[J].土木工程学报,2007,40(5):10-16.
[8]叶昆,李黎.近断层脉冲地震作用下偏心基础隔震结构的地震反应研究[J].工程力学,2009,26(7):163-169.
[9]杜永峰,李慧.双向地震激励下隔震结构抗倾覆特性的数值分析[J].计算机辅助工程,2011,20(1):42-46.
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