采用拉索减震支座的刚构桥横向抗震性能研究  

Study of Transverse Seismic Performance of Rigid-Frame Bridge Using Cable Sliding Friction Aseismic Bearings

作　　者：陈志刚 赵英策[2] 

机构地区：[1]长沙市规划设计院有限责任公司,湖南长沙410007 [2]中交公路规划设计院有限公司,北京100088

出　　处：《桥梁建设》2014年第2期38-42,共5页Bridge Construction

摘　　要：为了解拉索减震支座对刚构桥横向抗震性能的影响,以某(65+120+65)m预应力混凝土连续刚构桥为背景进行研究。基于拉索减震支座的抗震机理,采用MIDAS Civil(V8.0.5)软件建模,应用非线性动力时程方法分析该桥横向地震响应,并比较拉索减震支座参数(初始间隙及拉索刚度)对该桥抗震性能的影响。结果表明:拉索减震支座可有效降低刚构桥过渡墩的横向受力,同时可有效控制刚构桥主梁的运动形态;拉索减震支座对主墩抗震性能的影响较小;初始间隙越小、拉索刚度越大,拉索减震支座对主梁的约束作用越大。To have an understanding of the influences of the cable sliding friction aseismic bearings on the transverse seismic performance of rigid-frame bridge, a prestressed concrete con- tinuous rigid-frame bridge using the bearings and having span arrangement （65＋120＋65） m was taken as an example and the influences of the bearings were studied. In view of the seismic mech- anism of the bearings, the software MIDAS Civil （VS. 0.5） was used to set up the model, the nonlinear dynamic time-history method was used to analyze the transverse seismic response of the example bridge and the influences of the parameters （initial gaps and cable rigidity） of the bear- ings on the seismic performance of the bridge were compared. The results of the study indicate that the bearings can effectively reduce the transverse forces of the transition piers of the bridge and at the same time can effectively control the movement modes of the main girder of the bridge. The influences of the bearings on the seismic performance of the main piers of the bridge are lit- tle, the smaller the initial gaps are, the greater the cable rigidity is, the greater the constraint ac- tion of the bearings on the main girder will be.

关 键 词：刚构桥 抗震性能 拉索减震支座 有限元法 抗震设计 抗震研究 

分 类 号：U448.23[建筑科学—桥梁与隧道工程] U442.55[交通运输工程—道路与铁道工程]