基于简化模型的不等高墩CRTSⅡ板式无砟桥-轨系统地震研究  

Seismic study of CRTSⅡslab ballastless bridge rail system with unequal pier based on simplified model

作　　者：周旺保[1,2] 贾益铭 张云泰 蒋丽忠 彭东航[1] 赵胤婷 ZHOU Wangbao;JIA Yiming;ZHANG Yuntai;JIANG Lizhong;PENG Donghang;ZHAO Yinting(School of Civil Engineering,Central South University,Changsha 410075,China;National Engineering Laboratory for High-speed Railway Construction,Changsha 410075,China)

机构地区：[1]中南大学土木工程学院,湖南长沙410075 [2]高速铁路建造技术国家工程实验室,湖南长沙410075

出　　处：《铁道科学与工程学报》2023年第7期2361-2371,共11页Journal of Railway Science and Engineering

基　　金：国家自然科学基金资助项目(U1934207,52078487,52178180);湖南省交通科技项目(202011);中南大学创新驱动项目(502501006)。

摘　　要：为研究高速铁路CRTSⅡ板式无砟轨道−桥梁系统中不等高墩桥跨SUHP(Span of Unequal Height Pier)在地震作用下的地震响应特性,提出一种高速铁路CRTSⅡ板式无砟轨道−桥梁系统简化分析模型,结合不同工况下的多个算例对比分析全桥精细有限元模型和简化模型的地震响应计算结果,验证所提出的简化分析模型的有效性。基于简化分析模型,研究SUHP位置对高速铁路轨道-桥梁系统地震响应的影响规律,获取SUHP对高速铁路轨道−桥梁系统地震响应最不利的位置,分析SUHP在最不利位置下墩高比对高速铁路轨道−桥梁系统地震响应的敏感性,得到了5跨、7跨和9跨高速铁路轨道-桥梁系统地震响应参数随墩高比增加的变化规律。研究结果表明:提出的简化模型既可准确分析不等高高速铁路轨道−桥梁系统在地震作用下的全桥动力响应,又可对其任意桥跨进行局部分析,且具有较高的计算效率和精度;不等高墩桥跨显著增大了高速铁路轨道−桥梁系统的地震响应,地震作用下SUHP在轨道−桥梁系统中的最不利位置位于中间跨处;高速铁路轨道-简支梁桥系统的主梁最大位移、钢轨最大位移、普通墩的墩底剪力均随桥梁跨数及特殊墩墩高比的增大而显著增大。研究结果可为存在SUHP的板式无砟轨道−桥梁系统系统的抗震设计提供有效的参考依据。In order to study the seismic response characteristics of SUHP(Span of Unequal Height Pier)of highspeed railway CRTS II slab ballastless track bridge system under seismic action,a simplified analysis model of high-speed railway CRTS II slab ballastless track bridge system was proposed.The seismic response calculation results of the whole bridge fine finite element model and the simplified model were compared and analyzed in combination with multiple calculation examples under different working conditions.The effectiveness of the proposed simplified analysis model was verified.Based on the simplified analysis model,the influence law of SUHP position on the seismic response of high-speed railway track bridge system was studied,and the most unfavorable position of SUHP on the seismic response of high-speed railway track bridge system was obtained.The sensitivity of pier height ratio to the seismic response of high-speed railway track bridge system at the most unfavorable position of SUHP was analyzed,and the variation law of seismic response parameters of 5-span,7-span and 9-span high-speed railway track bridge system with the increase of pier height ratio was obtained.The results show that the simplified model can not only accurately analyze the dynamic response of the whole bridge of the track bridge system of unequal height high-speed railway under earthquake,but also locally analyze any bridge span,and has high calculation efficiency and accuracy.The bridge span with unequal height piers significantly increases the seismic response of the high-speed railway track bridge system.The most unfavorable position of SUHP in the track bridge system under earthquake is at the middle span.The maximum displacement of the main beam,the maximum displacement of the steel rail and the pier bottom shear force of the common pier of the track simply supported beam bridge system of the high-speed railway increase significantly with the increase of the bridge span and the height ratio of the special pier to the pier.The research re

关 键 词：不等高桥梁 等效模型 墩高比 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]