三门峡黄河公铁两用大桥主桥减隔震设计  

Seismic Mitigation and Isolation Design of Main Bridge of Sanmenxia Huanghe River Rail-cum-Road Bridge

作　　者：刘俊锋[1] 阮怀圣[1] 宁伯伟[1] 

机构地区：[1]中铁大桥勘测设计院集团有限公司,湖北武汉430056

出　　处：《桥梁建设》2014年第2期91-95,共5页Bridge Construction

摘　　要：三门峡黄河公铁两用大桥主桥采用（84＋9×108＋84）m连续钢桁结合梁结构，主梁恒载1030kN／m，墩高60～72m，桥址区水平地震动峰值加速度为0．18g，场地类别为Ⅲ类。为了达到抗震设防目标，主墩墩顶采用双曲面球型减隔震支座，支座球心距7m，摩擦系数0．03。采用MIDAS Civil软件建立全桥有限元模型进行地震动力分析，并根据分析结果进行桥墩与基础验算。验算结果表明：在设计地震作用下，主体结构均保持在弹性工作范围内；在罕遇地震作用下，墩底可能进入塑性屈服阶段，墩柱按延性构件设计。根据地震动力分析结果和桥墩、基础验算结果，确定双曲面支座抗剪栓水平承载力按1．4倍的多遇地震响应值设计。The main bridge of Sanmenxia Huanghe River Rail-cum-Road Bridge is a continu- ous composite steel truss girder structure with span arrangement （84＋9X 108＋84） m. The dead load of the main girder of the bridge is 1 030 kN/m and the pier height is 60-72 m. The horizon- tal ground motion peak acceleration in the bridge site area is 0.18g and the site type is of Class Ⅲ. To attain the goal of the seismic fortification, the hyperbolic spherical seismic mitigation and isolation bearings were arranged at the tops of the main piers. The spacing distance from spheri- cal center to spherical center of the bearings is 7 m and the friction coefficient is 0.03. In the de- sign, the software MIDAS Civil was used to set up the finite element model for the whole bridge, to carry out the analysis of the seismic dynamic and according to the analysis, the checking calcu- lation of the piers and foundations was made. The results of the checking calculation show that under the designed seismic action, the main structure of the bridge works in the elastic range while under the rare seismic action, the pier footings may come to the plastic yield stage and the pier columns should be designed as the ductile components. Based on the analysis of the seismic dynamic and the checking calculation of the piers and foundations, it is determined that the hori- zontal bearing capacity of the shear studs of the hyperbolic spherical bearings should be designed in terms of 1.4 times of the frequent seismic response values.

关 键 词：铁路公路两用桥 结合梁 钢桁梁 双曲面球型减隔震支座 减隔震设计 延性设计 抗 震设计 

分 类 号：U448.121[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]