高速铁路32 m跨径简支梁桥桥面反应谱研究  

Study on deck response spectrum of 32 m span simply-supported girder bridge for high-speed railway

作　　者：乔新柱 何畅 蒋丽忠[1] 杨娜[3] 董城 国巍[1] 蔡玉军[5] 张转转 刘明 QIAO Xinzhu;HE Chang;JIANG Lizhong;YANG Na;DONG Cheng;GUO Wei;CAI Yujun;ZHANG Zhuanzhuan;LIU Ming(School of Civil Engineering,Central South University,Changsha 410075,China;School of Civil Engineering,Tongji University,Shanghai 200092,China;School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China;China Railway Design Co.,Ltd.,Tianjin 300000,China;China Railway First Survey and Design Institute Group Co.,Ltd.,Xi’an 710043,China;China Railway 10th Co.,Ltd.,Jinan 250101,China)

机构地区：[1]中南大学土木工程学院,湖南长沙410075 [2]同济大学土木工程学院,上海200092 [3]北京交通大学土木建筑工程学院,北京100044 [4]中国铁路设计集团有限公司,天津300000 [5]中铁第一勘察设计院集团有限公司,陕西西安710043 [6]中铁十局集团有限公司,山东济南250101

出　　处：《铁道科学与工程学报》2023年第8期2803-2813,共11页Journal of Railway Science and Engineering

基　　金：国家自然科学基金资助项目(52008406);湖南省自然科学基金资助项目(2021JJ40737)。

摘　　要：桥站合一结构站房、接触网等高速铁路桥上设施地震响应受桥面加速度影响。为研究不同桥墩高度对高速铁路32 m跨径简支梁桥桥面地震加速度的影响,简化高速铁路桥梁上部结构的抗震设计流程,建立7座不同墩高的典型32 m跨径高速铁路简支梁桥有限元模型,计算得到不同地震作用下横桥向、顺桥向、竖直向的桥面加速度响应及反应谱。采用不同形式的曲线对桥面三向加速度反应谱进行拟合,获得了桥面谱曲线各参数与桥墩高度的关系。在此基础上,建立32 m跨径高速铁路简支梁桥-接触网耦合模型,验证了所提高速铁路简支梁桥桥面谱的准确性与适用性。研究结果表明,同桥墩高度高速铁路简支梁桥在不同位置处的加速度响应峰值呈现出由跨中向两侧墩顶逐渐减小的趋势。不同桥墩高度的32 m跨径高速铁路简支梁桥加速度反应谱曲线形式高度相似,但反应谱峰值存在显著差异。提出的高速铁路32 m跨径简支梁桥桥面谱与实际桥面加速度反应谱拟合情况良好,并能实现对接触网柱底应力的准确计算,可用于32 m跨径高速铁路简支梁桥上部结构的抗震分析。The seismic responses of the facilities,e.g.,station and catenary system,on high-speed railway bridge are affected by the acceleration of the bridge.To study the effects of the height of the pier on the seismic acceleration of the 32 m span high-speed railway simply-supported beam bridges and simplify the seismic design of structures on high-speed railway bridges,in this paper,the finite element models of seven 32 m span simplysupported beam bridges with different pier heights for high-speed railway were established.The acceleration responses and their spectra in the transverse,along-bridge and vertical directions under different seismic actions were obtained.Besides,the parameters in the three-dimensional acceleration response spectra of the high-speed railway bridge were fitted by using different functions.The relationships between each parameter and pier height were obtained.Moreover,the coupled models of high-speed railway simply-supported beam bridges and catenary system were established to verify the accuracy and adaptability of the proposed spectra.The results indicate that the peak acceleration response of high-speed railway bridges with the same pier height decreased gradually from the middle span to the pier top.The forms of acceleration response spectra curves of the 32 m span simplysupported beam bridges with different heights were highly similar,but the peak values of the response spectra were significantly different.The proposed acceleration response spectra fitted the actual response spectra well,and can predict the stress at the bottom cross section of the columns in the overhead catenary system accurately.The proposed acceleration response spectra can be used to analyze the seismic strength of the overhead catenary system installed on the 32 m span simplify-supported high-speed railway bridge.

关 键 词：高速铁路 简支梁桥 接触网 加速度 桥面反应谱 

分 类 号：U2[交通运输工程—道路与铁道工程]