地震作用下相邻结构间阻尼器的优化参数研究
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摘要
对地震作用下相邻结构间连接阻尼器的优化参数理论表达式的适用性作了详细的研究,分别为粘弹性阻尼器和粘滞流体阻尼器。共有两种减震控制目标,使主结构的平均相对振动能量最小和使两相邻结构的总平均相对振动能量最小。采用虚拟激励法,研究了小震作用下结构处于线弹性状态时阻尼器的优化参数取值,详细分析了结构模态阻尼比和场地条件的变化对阻尼器优化参数的影响;采用时域和频域分析方法,研究了强震作用下结构处于弹塑性状态时阻尼器的优化参数值,并与理论值进行了对比。结果表明,结构模态阻尼比和场地条件的变化对阻尼器的优化参数影响很小;结构处于弹塑性状态时阻尼器的优化参数值与结构处于线弹性状态的取值相差不大,均与理论值比较接近,该结论对于阻尼器的优化参数理论表达式的应用非常有利。
The applicability of the explicit expressions for the optimized parameters of dampers interconnecting adjacent structures under earthquake excitation was investigated,including those for visco-elastic damper and viscous fluid damper.Two control objectives were selected: minimization of the vibration energy of the main structure and minimization of the vibration energy of both adjacent structures.In linear elastic state,the pseudo-excitation method was used to study the optimum parameters of dampers and the effect of the change of structural modal damping ratio and site conditions on the parameters was discussed.When two structures are in elastic-plastic state under strong earthquake excitation,accodring to the records of white-noise ground motion and several actual earthquakes,the appropriate parameters of dampers were obtained through extensive parametric studies,and were compared with the theoretical values.The results show that,changes of the structural modal damping ratio and site conditions are of little effect on optimum parameters;the appropriate parameters of the dampers are nearly unchanged and relatively close to the theoretical values.The conclusion is beneficial for the use of the explicit expressions.
The applicability of the explicit expressions for the optimized parameters of dampers interconnecting adjacent structures under earthquake excitation was investigated,including those for visco-elastic damper and viscous fluid damper.Two control objectives were selected: minimization of the vibration energy of the main structure and minimization of the vibration energy of both adjacent structures.In linear elastic state,the pseudo-excitation method was used to study the optimum parameters of dampers and the effect of the change of structural modal damping ratio and site conditions on the parameters was discussed.When two structures are in elastic-plastic state under strong earthquake excitation,accodring to the records of white-noise ground motion and several actual earthquakes,the appropriate parameters of dampers were obtained through extensive parametric studies,and were compared with the theoretical values.The results show that,changes of the structural modal damping ratio and site conditions are of little effect on optimum parameters;the appropriate parameters of the dampers are nearly unchanged and relatively close to the theoretical values.The conclusion is beneficial for the use of the explicit expressions.
引文
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[2]Lu X L,Gong Z G,Weng D G,et al.The application of a new structural control concept for tall building with large podium structure[J].Engineering Structures,2007,29(8):1833-1844.
[3]Zhang W S,Xu Y L.Dynamic characteristics and seismic response of adjacent buildings linked by discrete dampers[J].Earthquake Engineering and Structural Dynamics,1999,28(10):1163-1185.
[4]Zhang W S,Xu Y L.Vibration analysis of two buildings linked by Maxwell model-defined fluid dampers[J].Journal of Sound and Vibration.2000,233(5):775-796.
[5]Zhu H P,Iemura H.A study of response control on the passive coupling element between two parallel structures[J].International Journal of Structural Engineering and Mechanics,2000,9(4):383-396.
[6]Zhu H P,Xu Y L.Optimum parameters of Maxwell model-defined dampers used to link adjacent structures[J].Journal of Sound and Vibration,2005,279(1-2):253-274.
[7]朱宏平,杨紫健,唐家祥.利用连接装置控制两相邻结构的地震动响应[J].振动工程学报,2003,16(1):56-61.ZHU Hong-ping,YANG Ze-jian,TANG Jia-xiang.Control of the seismic response of two adjacent structures using a damped link[J].Journal of Vibration Engineering,2003,16(1):56-61.
[8]Bhaskararao A V,Jangid R S.Optimum viscous damper for connecting adjacent SDOF structures for harmonic and stationary white-noise random excitations[J].Earthquake Engineering and Structural Dynamics,2007,36(4):563-571.
[9]Zhu H P,Ge D D,Huang X.Optimum connecting dampers to reduce the seismic responses of parallel structures[J].Journal of Sound and Vibration,2011,330(9):1931-1949.
[10]Wen Y K.Method for random vibration of hysteretic systems[J].Journal of the Engineering Mechanics Division,1976,102(EM2):249–263.
[11]林家浩,张亚辉.随机振动的虚拟激励法[M].北京:科学出版社,2004.
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