地震作用下相邻结构间阻尼器的优化参数研究  

Optimum parameters of dampers interconnecting adjacent structures under earthquakes

作　　者：黄潇[1,2] 朱宏平[1,2] 

机构地区：[1]华中科技大学土木工程与力学学院,武汉430074 [2]华中科技大学控制结构湖北省重点实验室,武汉430074

出　　处：《振动与冲击》2013年第16期117-122,共6页Journal of Vibration and Shock

基　　金：国家自然科学基金资助项目(51178203);国家杰出青年基金资助项目(50925828)

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.

关 键 词：相邻结构 粘弹性阻尼器 粘滞流体阻尼器 优化参数 地震作用 

分 类 号：TU311.3[建筑科学—结构工程]