摘要
郑济铁路济南黄河特大桥主桥采用(108+4×216+108) m五塔六跨混凝土部分斜拉桥,针对该桥桥塔数量较多、联长较大的特点,对纵、横向抗震体系进行研究,确定适宜的抗震体系方案,并考虑顺桥向地震动行波效应进行非一致激励响应分析。结果表明:主桥顺桥向采用双曲面减隔震支座体系可有效降低桥墩内力,罕遇地震下边墩墩-梁相对位移的最大值为295.9 mm,满足梁端位移需求;横桥向采用固定约束体系可满足罕遇地震需求;主、边墩处双曲面减隔震支座曲率半径分别取8 m和3.8 m,摩擦系数0.06;制动墩支座顺桥向设计剪断力按多遇地震力设计,同时在梁端设置横向限位装置;在非一致地震激励作用下桥墩内力有一定程度降低,边墩支座变形有较大程度增加,最大增幅约50%,应重点关注边墩支座位移需求和梁缝设计。
The main bridge of Jinan Huanghe River Bridge carrying a section of the Zhengzhou-Jinan Railway is a concrete extradosed bridge featuring five pylons that create four spans of 216 m and two spans of 108 m.To address the anti-seismic requirements of the bridge with multiple pylons and long expansion sections,studies have been carried out to select the proper longitudinal and transverse seismic restraint systems.And non-uniform excitation response analysis was conducted,considering the travelling wave effect of longitudinal ground motions.It is concluded that the bearings having curved(spherically shaped)sliding interfaces and restricting the longitudinal movement of the bridge can effectively reduce the internal forces of the piers.Under rare earthquakes,the maximum relative displacement of side piers to the super structure is 295.9 mm,capable of absorbing the girder-end displacement.A fixed restraint system is provided to restrict the transverse movement of the bridge under rare earthquakes.The bearings on the main and side piers measure 8 m and 3.8 m in curvature radius,respectively,but fitted with the same friction coefficient of 0.06.The shear strength of the bearings on abutment piers in the longitudinal restraint system is designed in accordance with the anti-seismic requirements of frequent earthquakes,and the bearings capable of restricting transverse movement of the girder are installed at the girder ends.Under non-uniform seismic excitation,the internal forces in the piers are lowered to a degree,the deformation of bearings on side piers is significantly increased,with a maximum increase rate of 50%.The movement of the bearings on side piers as well as the locations of girder joints should also be the design focuses.
作者
康银庚
陈磊
杜通道
张上
刘敏
KANG Yingeng;CHEN Lei;DU Tongdao;ZHANG Shang;LIU Min(Engineering Management Center,China State Railway Group Co.,Ltd.,Beijing 100844,China;China Railway Design Cooperation,Tianjin 300308,China)
出处
《世界桥梁》
北大核心
2025年第4期78-86,共9页
World Bridges
基金
中国铁路设计集团有限公司科技开发课题(2020YY240602)。
关键词
高速铁路桥
部分斜拉桥
长联多塔
抗震体系
双曲面减隔震支座
横向限位装置
非一致激励
抗震设计
high-speed railway
extradosed bridge
long expansion section and multiple pylon
seismic system
spherically-shaped seismic isolator
transverse movement limiter
non-uniform excitation
seismic design
