摘要
依托城市轨道桥梁中一座三跨预应力混凝土连续梁桥开展实桥动力学试验,测试得到跨中动挠度时程曲线,建立了轨道列车-桥梁耦合有限元模型,通过与实测数据对比,验证了有限元模型的有效性。基于车桥耦合有限元模型,开展考虑轨道不平整度及桥梁跨径的双参数影响下冲击系数研究,分析后发现:实际测量得到的冲击系数较我国铁路规范值偏大;不平整度及桥梁跨径对桥梁结构的冲击系数影响明显,考虑不平整度影响后,冲击系数取值较我国现行铁路规范中规定值偏大;同一跨径下不平整度等级越差,冲击系数取值也越大。
In this paper relying on a three-span PC continuous girder bridge in urban rail-track bridge,real bridge dynamic tests are carried out.The time history curve of trans-middle dynamic deflection is obtained.The finite element model of rail train-bridge coupling is established,the validity of the finite element model is verified by comparison with measured data.Based on the coupled finite element model of the vehicle and bridge,the impact coefficient under the influence of two parameters considering the track irregularity and the span of the bridge is studied.It is found after analysis that:the value of the impact coefficient actually measured is larger than that specified in the current Chinese railway code;unevenness and bridge span length have obvious impact on the impact coefficient of bridge structure,and after considering the influence of unevenness,the impact coefficient is larger than that in the current Chinese railway specifications;and the worse the level of unevenness under the same span,the greater the value of the impact coefficient.
作者
赵香萍
李晓超
高华睿
王晗
张峰
ZHAO Xiang-ping;LI Xiao-chao;GAO Hua-rui;WANG Han;ZHANG Feng(China Railway 12th Bureau Group Co.Ltd.,Taiyuan 030024,China;School of Qilu Transportation,Shandong University,Jinan 250061,China)
出处
《公路》
北大核心
2020年第1期63-69,共7页
Highway
关键词
桥梁工程
车桥耦合
轨道不平整度
桥梁跨径
冲击系数
数值模拟
研究
bridge engineering
vehicle-bridge coupling
track irregularity
bridge span
impact coefficient
numerical simulation
study
