有砟轨道对典型单线铁路简支梁桥地震响应的影响

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英文篇名：Effects of ballast track structure on seismic responses of simply supported bridges in a single line railway 作者：韩国庆 ; 蒋丽忠 ; 魏标 ; 王祯伟 ; 李朝斌 英文作者：HAN Guoqing;JIANG Lizhong;WEI Biao;WANG Zhenwei;LI Chaobin;China Railway Eryuan Engineering Group Co., Ltd;School of Civil Engineering, Central South University;Zhejiang Provincial Insitute of Communications Planning,Design & Reserach; 关键词：单线铁路 ; 简支梁桥 ; 有砟轨道 ; 支座类型 ; 地震响应 英文关键词：single line railway;;simply supported bridge;;ballast track;;bearing type;;seismic response 中文刊名：CSTD 英文刊名：Journal of Railway Science and Engineering 机构：中铁二院工程集团有限责任公司;中南大学土木工程学院;浙江省交通规划设计研究院; 出版日期：2019-03-15 出版单位：铁道科学与工程学报 年：2019 期：v.16;No.108 基金：国家自然科学基金资助项目(51778635,51778630) 语种：中文; 页：CSTD201903017 页数：8 CN：03 ISSN：43-1423/U 分类号：140-147

摘要

针对8 m和25 m 2种墩高、普通支座和摩擦摆支座2种支座的4种不同的典型单线铁路简支梁桥,研究有砟轨道对其地震响应的影响程度。采用OpenSEES程序,分别建立考虑有砟轨道和不考虑有砟轨道的2种桥梁有限元模型。通过两者动力特性的对比分析,确定有砟轨道对桥梁周期和振型的影响趋势;通过两者在不同方向、不同烈度的地震动作用下主要构件(主梁、支座、桥墩)地震响应的对比分析,确定有砟轨道对桥梁地震响应的影响程度。研究结果表明:针对动力特性相同的相邻简支梁桥,有砟轨道对横桥向地震响应影响甚微,对纵桥向的相应影响与墩高、支座和地震动强度等因素有关,但影响程度总体上不大于10%,仅部分支座地震反应明显减小。因此,在进行典型单线铁路简支梁桥地震响应分析时,可以不考虑有砟轨道刚度的影响,简化计算过程,并得到偏于保守的抗震设计结果。
        Aiming at 4 different simply supported bridges, respectively combined by two pier heights of 8 m and 25 m and two types of bearings of spherical steel bearing and friction pendulum bearing, in a single line railway,the effects of ballast track structure on their seismic responses were studied. The OpenSEES program was used to build two comparable types of finite element models, with and without considering the ballast track structure. The influence of ballast track on the structural vibration modes and periods was identified through carrying out the analysis of dynamic characteristics. The influence of ballast track on the structural seismic responses was obtained by analyzing the seismic responses of girder, bearings and piers under earthquakes with different input directions and intensities. The results show that the structural seismic responses in the transverse direction are almost not influenced by the ballast track, while those influence rules in the longitudinal direction are influenced by the pier heights, bearing types and ground motion intensities for the adjacent simply supported bridges with the same dynamic characteristics. However, the most influence range is not greater than 10% except the significantly reduced displacement of some bearings. The effects of ballast track stiffness can be ignored when analyzing the seismic responses of simply supported bridges in a single line railway. The treatment will simplify the calculation process and obtain the safer seismic design results.

引文

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