基于能量原理的阻尼器隔震结构地震响应预测
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摘要
建立在地震作用下设置阻尼器的基础隔震结构在最大地震响应时刻的能量平衡方程,给出了结构隔震支座和阻尼器的能量表达式,演算了基于能量平衡的设置阻尼器的基础隔震结构的地震响应预测式。选用人工地震波和天然地震波,利用时程分析法的解析值验证了地震响应预测式的精度,比较研究了仅设置粘性阻尼器和同时设置粘性阻尼器和滞回阻尼器的基础隔震结构的抗震性能。研究表明:对于不同的输入地震波,能量法的地震响应预测值包络了多数时程分析的结果,能较好地预测基础隔震结构的地震响应值。在基础隔震结构设计中,建议在隔震层同时设置粘性阻尼器和滞回阻尼器,粘性阻尼器的阻尼比在0.3～0.4之间。
Energy-balance equation of a base-isolated structure with dampers was establised for a moment with its maximum seismic responses.The expression of elastic vibration energy of isolator and plastic energy of dampers were given.The formulas to predict the seismic responses of isolated structures with dampers were derived based on the energy balance equation.Finally,a number of earthquake waves were chosen to validate the accuracy of the predicted responses using time history method.Aseismic properties of base-isolated structures with and without hysteretic dampers are studied.Results indicate that the response prediction curves can match well and envelop most of the time history responses for a class of earthquake records.It is proper to use energy method to predict the responses of the base-isolated structures with dampers under earthquake.Some suggestions for design are also put forward,the both viscous damper and hysteretic damper should be installed in isolated storey,and the damping ratio should be in range from 0.3 to 0.4.
Energy-balance equation of a base-isolated structure with dampers was establised for a moment with its maximum seismic responses.The expression of elastic vibration energy of isolator and plastic energy of dampers were given.The formulas to predict the seismic responses of isolated structures with dampers were derived based on the energy balance equation.Finally,a number of earthquake waves were chosen to validate the accuracy of the predicted responses using time history method.Aseismic properties of base-isolated structures with and without hysteretic dampers are studied.Results indicate that the response prediction curves can match well and envelop most of the time history responses for a class of earthquake records.It is proper to use energy method to predict the responses of the base-isolated structures with dampers under earthquake.Some suggestions for design are also put forward,the both viscous damper and hysteretic damper should be installed in isolated storey,and the damping ratio should be in range from 0.3 to 0.4.
引文
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[3]赵光伟,裴星洙,周晓松.基于能量平衡的建筑结构地震响应预测法基础研究[J].工业建筑,2006,36:182-187.ZHAO Guangwei,PEI Xingzhu,ZHOU Xiaosong.The fundamental research on prediction method of structural earthquake response based on ener-gy balance[J].Industrial Construction,2006,36:182-187.
[4]Higashino S,Kitamura H.Energy-balance based seismic response prediction methods for seismic isolated buildings with rubber bearings and viscousdampers.[J].J.Struct.Constr.Eng.,Aij,Np.588,79-86.
[5]Zhou Fu lin,Yan Ping,Xian Qiaolin,et al.Research and application of seismic Isolation system for bullding structures[J].Joumal of Architectureand Civil Engineering,2006,23(2):1-8.
[6]张颖,谭平,周福霖.基于能量平衡的层间隔震结构地震响应预测[J].振动与冲击,2009,28(4):137-141.ZHANG Ying,TAN Ping,ZHOU Fulin.Seism ic response prediction for a story-isolation structure based on energy balance method[J].Journalof Vibration and Shock.2009,28(4):137-141.
[7]日本建築学会,免震構造設計指針[M].日本技报堂出版社,2001.Architecture institure of JAPAN,Recommendation for the design of based isolated buildings[M].Japan:Jibaotang Press,2011.
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