大型渡槽智能隔震数值模拟  

Numerical simulation of intelligent seismic isolation of large-scale aqueduct

作　　者：郑明燕[1] 杨世浩[1,2] 李正农[2] 

机构地区：[1]中国地质大学(武汉)工程学院,湖北武汉430074 [2]湖南大学建筑安全与节能教育部重点实验室,湖南长沙410082

出　　处：《武汉大学学报（工学版）》2011年第1期21-25,共5页Engineering Journal of Wuhan University

基　　金：国家科技支撑计划课题资助(编号:2006BAB04A05)

摘　　要：大流量渡槽上部结构质量很大,远大于一般桥梁的上部结构,在地震作用下,惯性力很大.为减轻地震作用,常采用隔震支座.但在地震作用下,隔震支座的位移可能过大,为了控制支座位移,采用磁流变阻尼器来进一步控制,形成所谓智能隔震控制.首先给出了某大型渡槽智能化隔震模型.智能隔震结构由隔震支座和磁流变智能阻尼器构成,然后对地震作用下的某大型渡槽进行时程分析.分析数据表明,智能隔震模型能有效减轻地震作用,同时又不会让渡槽槽身侧向位移太大,保证了槽身和支座的安全.The mass of superstructure of massive flow aqueduct is much more than that of ordinary road bridge.Therefore,the seismic isolation bearings are often employed in order to reduce huge inertial force of superstructure under earthquake.But the displacement of seismic isolation bearing may be larger than that of the ordinary bearing.This may results in beyond of maximum displacement of the bearing and damage to nearby water seal gland.Therefore,it is necessary to employ MR damper,forming intelligent seismic isolation structure combined with seismic isolation bearing,to further reduce the displacement.This paper,at first,presented the model of this isolation structure.In the model,one span aqueduct is considered,the behavior of the pier is assumed to be linear;and control strategy employs clipped optimal control.Then,time history analyses were carried out.The result from these numerical analyses shows that the intelligent isolation structure can effectively reduce response of earthquake and keep displacement of the bearing within the limitation.

关 键 词：水工结构 数值模拟 渡槽 智能隔震结构 

分 类 号：TV312[水利工程—水工结构工程]