铁路新型钢-混凝土组合桁架桥在列车作用下的动力响应分析  

Dynamic analysis of a new type of railway steel-concrete composite trussed bridge under running trains excitation

作　　者：郭薇薇[1] 夏禾[1] 李慧乐[1] 张田[1] 

机构地区：[1]北京交通大学土木建筑工程学院,北京100044

出　　处：《振动与冲击》2012年第4期128-133,共6页Journal of Vibration and Shock

基　　金：国家自然科学基金资助项目(50838006);中央高校基本科研业务费专项资金资助项目(2009JBM078)

摘　　要：对一种由三角形桁架和混凝土槽形板组成的铁路新型钢-混凝土组合桁架桥建立了车-桥动力相互作用空间分析模型,它由车辆模型和有限元桥梁模型组合而成,以轨道不平顺作为系统的自激激励源。以西安-平凉铁路上的马屋泾河特大桥主桥为工程背景,对这种新型钢-混组合结构的车桥耦合振动进行了动力仿真分析。对桥梁在重载货车、中速客车、高速客车等不同列车荷载工况下的动力响应进行了数值计算,并对桥上车辆的走行性能进行了评价。计算结果表明:该桥式方案能够满足三种类型列车在不同等级车速范围内安全、舒适的运行,可广泛用于我国货运、普通客运及高速铁路。A 3-D dynamic interaction model of a new type of railway steel-concrete composite trussed bridge consisting of a triangular truss and a grooved concrete slab with a running train was established,which is composed of a train model and a finite element bridge model under the excitation source of measured track irregularities.Taking the Mawu Jinghe Bridge locating on the railway between Xi＇an and Pingliang as the engineering background,the dynamic analysis of train-bridge coupled system was performed.The dynamic responses of the bridge under the running loads of heavy haul freight cars,common and high speed passenger cars,were calculated respectively and the running ability of the train on the bridge was evaluated.Numerical results show that the bridge scheme can satisfy the running safety and comfort of the three types of trains at different speeds on the bridge and can be widely adopted in railway transportation in China.

关 键 词：钢-混组合桁架桥 列车 耦合振动 动力响应 

分 类 号：U442[建筑科学—桥梁与隧道工程]