近场地震下层间隔震偏心结构的减震控制
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摘要
提出了近场地震分析模型,建立了层间隔震偏心结构平-扭耦联运动方程。基于三刚片系简化模型分析了偏心参数对层间隔震偏心结构的影响规律,定量分析了近场地震中脉冲分量对层间隔震偏心结构地震反应的作用效应。研究了在隔震层附设黏滞阻尼器的参数优化规律并对某典型算例进行了仿真分析。结果表明,在层间隔震体系隔震层处设置参数合适的黏滞阻尼器可有效地控制上部结构、隔震层与下部结构结构的地震响应,减小结构的基底剪力,对改善层间隔震偏心结构的地震安全性具有非常重要的作用。
A near-field ground model was proposed.Motion equation of an inter-story isolated eccentric structure was derived.Based on three-rigid-panel model of the inter-story isolated eccentric structure,the influence of eccentric parameters on the structure was investigated.Near-field effect on the structure was analyzed by adjusting the pulse period and proportion of pulse component.The optimization law of viscous dampers,which are installed on the isolation story,was developed.Numerical simulations were conducted to verify the control effectiveness of nonlinear viscous dampers.The results show that the optimal viscous damper can significantly reduce the responses of the substructure,isolation level and superstructure of the inter-story isolation system and greatly enhance the safety of inter-story isolated eccentric structure subjected to near-field ground motion.
A near-field ground model was proposed.Motion equation of an inter-story isolated eccentric structure was derived.Based on three-rigid-panel model of the inter-story isolated eccentric structure,the influence of eccentric parameters on the structure was investigated.Near-field effect on the structure was analyzed by adjusting the pulse period and proportion of pulse component.The optimization law of viscous dampers,which are installed on the isolation story,was developed.Numerical simulations were conducted to verify the control effectiveness of nonlinear viscous dampers.The results show that the optimal viscous damper can significantly reduce the responses of the substructure,isolation level and superstructure of the inter-story isolation system and greatly enhance the safety of inter-story isolated eccentric structure subjected to near-field ground motion.
引文
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[7]Tan P,Agrawal A K,Pan Y.Near-filed effects on seismicallyexcited highway bridge equipped with nonlinear viscousdampers[J].Bridge Structures.2005,1(3):307-318.
[8]He W L,Agrawal A K.Analytical model of ground motionpulses for the design and assessment of seismic protectivesystems[J].J.of Structure Engineering,2008,134(7):1177-1188.
[2]祁皑.层间隔震技术评述[J].地震工程与工程振动,2004,24(6):114-120.
[3]周福霖,张颖,谭平.层间隔震体系的理论研究[J].土木工程学报,2009,42(8):1-8.
[4]Bray J D,Marek R.Characterization of forward-directivityground motions in the near-fault region[J].Soil DynamEarthquake Eng,2004,24:815-828.
[5]Hall J F,Heaton T H,Halling M W,et al.Near-sourceground motions and its effects on flexible buildings[J].Earthquake,Spectra,1995,11(4):569-605.
[6]刘启方,袁一凡,金星,等.近断层地震动的基本特征[J].地震工程与工程振动,2006.26(2):1-10.
[7]Tan P,Agrawal A K,Pan Y.Near-filed effects on seismicallyexcited highway bridge equipped with nonlinear viscousdampers[J].Bridge Structures.2005,1(3):307-318.
[8]He W L,Agrawal A K.Analytical model of ground motionpulses for the design and assessment of seismic protectivesystems[J].J.of Structure Engineering,2008,134(7):1177-1188.
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