大跨度连续刚构桥双柱墩系梁抗震影响因素分析  

ANALYSIS OF SEISMIC INFLUENCING FACTORS OF DOUBLE COLUMN PIER SYSTEM BEAMS IN LARGE SPAN CONTINUOUS RIGID FRAME BRIDGES

作　　者：王博妮 张明明 薛纬华 Wang Bo-ni;Zhang Ming-ming;Xue Wei-hua

机构地区：[1]中铁工程设计咨询集团有限公司郑州设计院,郑州450000

出　　处：《建筑技术开发》2024年第4期101-104,共4页Building Technology Development

摘　　要：为研究大跨度连续刚构桥双柱墩的抗震性能和墩身系梁对桥梁抗震的影响,以青龙涧特大桥上跨陇海铁路立交涉铁工程大跨度连续刚构桥为背景,采用MIDAS有限元软件分别建立不同形式全桥有限元分析模型,进行E1、E2地震作用下的反应谱分析、时程分析和E2地震作用下桥墩延性抗震分析。结果表明:在E1地震作用下桥梁均未进入延性,各模型全桥完全处于弹性阶段,桥梁特征部位响应满足抗震需求,在E2地震作用下,墩底出现塑性铰区域,墩顶位移能力满足需求。对于长细比较大的桥墩,横系梁的设置会增大桥墩横向刚度并改善墩柱自身的弯矩分布,对桥梁抗震有利。在桥梁进入延性抗震阶段时,增设横系梁会减少墩顶位移,在满足延性抗震需求的情况下对桥梁稳定性有利。To investigate the seismic performance of large-span continuous rigid-frame bridges with twin piers and the influence of the pier-body-to-beam system on seismic resistance,considering the Qinglongjian Special Bridge spanning over the Longhai Railway in the context of the interchange project,finite element analysis models were established using Midas software for different configurations of the entire bridge.Response spectrum analysis and time history analysis were conducted under E1 and E2 seismic actions,along with pier ductility seismic analysis under the E2 seismic action.Results indicate that under E1 seismic action,the bridge did not enter the ductile phase,remaining entirely within the elastic range.The response of critical components met seismic requirements.Under E2 seismic action,plastic hinge regions appeared at the pier base,demonstrating sufficient displacement capacity at the pier top.For tall and slender piers,the introduction of transverse beams increased lateral stiffness and improved the bending moment distribution of the pier columns,contributing to seismic resistance.During the ductile seismic phase,adding transverse beams reduced pier top displacement,enhancing the stability of the bridge while meeting ductility requirements.

关 键 词：大跨度连续刚构桥 地震时程分析 延性抗震 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]