摘要
为科学合理地获取新型波形钢腹板组合梁桥在车辆荷载作用下的动力响应,建立了新型波形钢腹板组合梁桥和车辆结构的振动方程,并通过车桥接触关系形成车桥耦合振动的动力学方程。以某新型波形钢腹板组合梁桥为研究背景,运用ANSYS建立桥梁的有限元模型,通过Universal Mechanism(UM)软件前处理程序建立13自由度车辆动力学模型,基于UM软件后处理程序建立车桥耦合振动仿真模型。获取了三座新型波形钢腹板组合梁桥在单车工况、横向双车工况和纵向双车工况下的动力响应,计算桥梁在三种工况下的车致动力冲击系数。结果表明:动力冲击系数受到多个因素共同影响,《公路桥涵设计通用规范》(JTG D60-2015)给出的估算公式误差较大;车速对桥梁动力响应的影响较复杂且规律不明显;多车纵向排列行驶通过桥梁,可减小桥梁的动力冲击效应。
In order to scientifically and rationally obtain the dynamic response of the new-type composite girder bridge with corrugated steel webs under the action of vehicle load, the vibration equation of the new-type composite girder bridge with corrugated steel webs and the vehicle structure has been established, and the dynamic equation of the coupling vibration of the vehicle-bridge has been formed through the vehicle-bridge contact relationship. Taking a new type of composite girder bridge with corrugated steel webs as the research background, the finite element model of the bridge has been established by ANSYS, the 13-DOF vehicle dynamics model has been established by the Universal Mechanism(UM) software pre-processing program, and the vehicle-bridge coupling vibration simulation model has been established based on the UM software post-processing program. The dynamic responses of three new type composite girder Bridges with corrugated steel webs have been obtained under single-vehicle, transverse two-vehicle and longitudinal two-vehicle working conditions, and the vehicle-induced dynamic impact coefficients of the Bridges have been calculated under three working conditions. The results have shown that the dynamic impact coefficient is affected by many factors, and the error of the estimation formula given in General Code for Highway and Bridge Design(JTG D60-2015) is large. The influence of vehicle speed on dynamic response of bridge is very complicated and the influence law is not obvious. The dynamic impact effect of the bridge can be reduced by the longitudinal arrangement of multiple vehicles.
作者
余奋亿
于海峰
邱妍辉
YU Fengyi;YU Haifeng;QIU Yanhui(Guangzhou Tonghui Engineering Co.,Ltd.,Guangzhou Guangdong China 510640;Guangdong Jiaoke Testing Co.,Ltd.,Guangzhou Guangdong China 510550)
出处
《广东公路交通》
2022年第6期65-73,共9页
Guangdong Highway Communications
关键词
桥梁工程
动力响应
数值仿真
波形钢腹板
动力冲击系数
bridge engineering
dynamic response
numerical simulation
corrugated steel web
dynamic impact coefficient
