基于车桥耦合的刚构—连续组合梁桥动力响应分析
Dynamic Response Analysis of Rigid Frame Continuous Composite Beam Bridge Based on Vehicle-Bridge Coupling
张建飞 1吴超 1方锐 1史言稳2
作者信息
- 1. 安庆职业技术学院建筑工程学院,安徽安庆 246003
- 2. 江苏金普工程咨询有限公司,江苏徐州 221700
- 折叠
摘要
为了研究车辆对大跨度刚构—连续组合体系梁桥动力响应的影响,探究其主梁动力响应及动力冲击系数的变化规律.基于车辆动力学和模态叠加法,建立了 15自由度的空间五轴重卡车,以三跨(95 m+150 m+95 m)刚构—连续组合体系梁桥为工程背景,基于车辆与桥梁的位移和力学耦合关系,在MATLAB中编制了车桥耦合振动响应求解程序,分析了车重、桥面不平度及桥梁阻尼比等参数对刚构—连续组合体系梁桥的动力响应影响.结果表明,主梁位移随车重的增加而增大,动力冲击系数随车重的增加而减小;路面不平度对桥梁振动影响较大,位移、内力的幅值和动力冲击系数都随着路面等级的降低而增加;桥梁阻尼比对桥梁位移和内力影响显著,位移、内力的幅值和动力冲击系数随着桥梁阻尼比的增加而减小.
Abstract
In order to study the impact of vehicles on the dynamic response of a long span rigid frame con-tinuous composite beam bridge,the dynamic response of its main beam and the variation of its dynamic impact coefficient were investigated.Based on vehicle dynamics and modal superposition method,a 15 de-gree of freedom spatial five axle load truck was established.Taking a three span(95 m+150 m+95 m)rigid frame continuous composite beam bridge as the engineering background and based on the displace-ment and mechanical coupling relationship between the vehicle and the bridge,a vehicle bridge coupling vibration response solution program was compiled in MATLAB,and the influence of parameters such as vehicle weight,bridge deck irregularity and bridge damping ratio on the dynamic response of rigid frame continuous composite beam bridges was also studied.The results show that the displacement of the main beam increases with the increase of vehicle weight,and the dynamic impact coefficient decreases with the increase of vehicle weight.Pavement roughness has a significant impact on bridge vibration,and the am-plitude of displacement,internal force,and dynamic impact coefficient increase with the decrease of pave-ment grade.The bridge damping ratio has a significant impact on the displacement and internal force of the bridge,and the amplitude and dynamic impact coefficient of the displacement and internal force de-crease with the increase of the bridge damping ratio.
关键词
刚构—连续组合体系梁桥/车桥耦合/动力响应/敏感参数分析Key words
rigid frame continuous composite system beam bridge/vehicle-bridge coupling/dynamic re-sponse/sensitive parameter analysis引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据