设置黏滞阻尼器的超高墩大跨铁路连续钢桁梁桥纵向减震性能研究  

Study on Longitudinal Seismic Mitigation Performance of a Long-Span Railway Continuous Steel Truss Girder Bridge with Ultra-High Piers Using Fluid Viscous Dampers

作　　者：邵长江[1] 漆启明 韦旺 王应良 戴晓春[3] 黄辉 SHAO Changjiang;QI Qiming;WEI Wang;WANG Yingliang;DAI Xiaochun;HUANG Hui(School of Civil Engineering,Southwest Jiaotong University,Chengdu Sichuan 610031,China;China Railway International Group,Beijing 100039,China;China Railway Eryuan Engineering Group Co.,Ltd.,Chengdu Sichuan 610031,China)

机构地区：[1]西南交通大学土木工程学院,四川成都610031 [2]中铁国际集团有限公司,北京100039 [3]中铁二院工程集团有限责任公司,四川成都610031

出　　处：《中国铁道科学》2021年第6期27-38,共12页China Railway Science

基　　金：国家自然科学基金资助项目(51978581,51178395);四川省应用基础研究重点课题(2017JY0059)。

摘　　要：以某超高墩铁路连续钢桁梁桥为研究对象,运用SAP2000软件建立全桥空间有限元模型,通过动力非线性时程分析,进行设置不同参数黏滞阻尼器的超高墩大跨连续钢桁梁桥纵向减震性能研究。结果表明:合理设置阻尼器能够协同各墩受力,可显著降低支座、梁端和墩顶位移;受高阶振型影响,超高墩的墩顶位移与墩底内力响应没有直接对应关系,墩身中部弯矩响应包络图饱满、外凸;随着墩高的降低,墩身剪力及弯矩包络逐渐趋于线性,高阶振型的影响削弱,减震规律逐渐趋近中低墩;阻尼器可使超高墩的墩身地震内力重分布,有效改善墩身的剪力响应,中间2个超高墩(139和154 m)中部的弯矩响应相比无阻尼器情况分别减小约26%和27%。在进行超高墩的抗震设计时,应特别关注墩身中部的抗震性能验算。Taking a railway continuous steel truss girder bridge with ultra-high piers as the research object,the spatial finite element model of the whole bridge was established by using SAP2000 software and the dynamic nonlinear time history analysis was conducted.The longitudinal seismic mitigation performance of the long-span continuous steel truss girder bridge with ultra-high piers was studied with setting different parameters of fluid viscous damper(FVD).The results show that the reasonable setting of FVDs can coordinate the forces among piers,thus obviously reducing the displacement of bearing,girder end and pier top.Under the influence of higher order modes,there is no direct corresponding relationship between the top displacement and bottom internal force response of ultra-high piers,and the envelope diagram of the bending moment response in the middle of the pier shaft is full and convex.With the decrease of pier height,the shear force and bending moment envelope of the pier shaft gradually tend to be linear.The influence of higher order modes is weakened,and the seismic mitigation law tends to be that of low-to-medium piers.The FVDs can redistribute the seismic internal force of the pier shaft and effectively relieve the shear response of the ultra-high pier.Compared with the situation without FVDs,the bending moment response in the middle part of the two ultra-high piers(139 m and 154 m)is reduced by about 26% and 27% respectively.In the seismic design of ultra-high piers,special attention should be paid to the seismic performance checking in the middle of the pier shaft.

关 键 词：铁路连续钢桁梁桥 超高墩 高阶振型 黏滞阻尼器 减震性能 

分 类 号：U211.9[交通运输工程—道路与铁道工程]