近场地震作用下高速铁路简支梁桥行车安全性影响研究  

Research on Driving Impact on High-speed Railway Simply Supported Beam Bridges under Near-field Earthquakes

作　　者：户东阳[1] 陈克坚[2] 李聪林[1] 吕雷 HU Dongyang;CHEN Kejian;LI Conglin;Lü Lei(Kunming Survey,Design and Research Institute Co.,Ltd.of CREEC,Kunming 650200,China;China Railway Eryuan Engineering Group Co.,Ltd.,Chengdu 610031,China)

机构地区：[1]中铁二院昆明勘察设计研究院有限责任公司,昆明650200 [2]中铁二院工程集团有限责任公司,成都610031

出　　处：《铁道标准设计》2021年第3期99-105,共7页Railway Standard Design

基　　金：四川省重点研发计划项目(2019YFG0048);中铁二院工程集团有限责任公司科技研究开发计划项目(KYY2018059(18-20))。

摘　　要：为评估近场地震作用下渝昆高铁典型规则与非规则简支梁桥的行车安全性,分别建立等墩高10跨简支梁桥与某实际非规则铁路简支梁桥有限元模型,首先对不同抗震方案进行比选,在此基础上,计算各桥梁动力特性,选取桥址周围实际近场地震动作为输入,考虑列车不同行车速度,对4种不同桥梁结构进行列车-桥梁耦合系统时程分析。选取列车脱轨系数、轮轨减载率、列车水平加速度、竖向加速度指标评价列车行车安全性,对比研究不同墩高桥梁结构、地震动输入强度、行车速度对安全行车的影响。结果表明:不同安全性评价指标对列车行车速度和地震动强度的敏感性不同,非规则简支梁桥的行车安全性需更加引起注意。In order to evaluate the driving impact on typical regular and irregular simply supported beam bridges of Chongqing Kunming High Speed Railway under the action of near-field earthquake,the finite element models of 10 span simply supported beam bridges and the actual irregular simply supported beam bridges are established respectively.Firstly,different seismic schemes are compared.And then dynamic characteristics of each bridge are calculated.Taking the actual near-field earthquake action around the bridge site as the input and considering the different train speeds,this paper conducts time-procedure analysis of train-bridge coupling system for four different bridge structures.The derailment coefficient,wheel rail load reduction rate,horizontal acceleration and vertical acceleration of the train are used as the evaluation indexes of train operation safety to analyze the influences of different bridge structure forms,different ground motion intensity and different train operation speed on train operation.The results show that the sensitivities of different safety evaluation indexes to train speed and ground motion intensity are different,and more attention should be paid to the safety of irregular simply supported beam bridge.

关 键 词：高速铁路 铁路桥 简支梁桥 行车安全 近场地震 

分 类 号：U442.55[建筑科学—桥梁与隧道工程] U441.7[交通运输工程—道路与铁道工程]