多维多点激励下大跨度连体高层结构减振研究  

Vibration Controls on Long-span Connected Structures Under Multi-dimensional and Multi-supported Earthquake Excitations

作　　者：陈尚鸿[1] 林伟[1] 祁皑[1] 

机构地区：[1]福州大学土木工程学院,福建福州350108

出　　处：《厦门大学学报（自然科学版）》2015年第2期286-291,共6页Journal of Xiamen University：Natural Science

基　　金：国家自然科学基金(51108089);福建省自然科学基金(2011J05128);高等学校博士学科点专项科研基金(20113514120005)

摘　　要：针对连体高层结构连廊跨度不断增大的趋势,在多维多点地震激励下采用黏滞阻尼器对其进行了减振研究.首先从主动线性二次型调节(LQR)理论出发推导了阻尼器的主动最优控制力以指导阻尼器选型,进而通过在一大跨度连体高层结构算例在一致激励以及多维多点激励下对其进行了减振数值模拟研究.结果表明在连体高层结构上布置黏滞阻尼器可以有效减小地震响应并提高其抗震安全性,但同时也发现地震动空间效应会使减振效果发生明显波动,因此在设计减振方案后应考虑不同地震激励条件对减振效果进行验证.As the span of connected structure becomes larger,vibration controls using viscous dampers on long-span connected structures are studied under multi-dimensional and multi-supported earthquake excitation.The optimal control force is first derived with linear quedratic regulator（LQR）active control theory,and then a simulation example is given under both uniform and multi-dimensional and multi-supported excitations.Simulation results show that the viscous damper can efficiently reduce the responses and enhance the aseismic safety of the structure.However,results also show that the control efficiency may vary a lot due to earthquake spatial effect.Therefore,simulation should be performed under different earthquake inputs when we design the control scheme.

关 键 词：大跨度结构 连体高层结构 多维多点激励 振动控制 黏滞阻尼器 行波效应 

分 类 号：TU311.3[建筑科学—结构工程]