摘要
针对异型系杆拱桥车桥耦合的动力响应问题,深入探究其车桥耦合振动响应特性及关键影响因素。基于车桥耦合振动理论,建立包含9自由度三轴重车模型与异型系杆拱桥有限元模型的耦合系统。通过Midas Civil模型对比及实桥动应变测试,验证模型的可靠性。系统分析车速、桥面不平顺等级和车辆载重对桥梁关键部位动力响应的影响。结果表明:车速在60~75km/h动力响应尤为剧烈,在特定车速下易引发共振,加剧振动。路面不平顺等级降低会增大车辆对桥梁的冲击荷载和桥梁动位移。与光滑路面相比,D级不平顺导致主梁跨中最大动位移增加29.5%。车重增加会线性增大位移响应,超重工况(≥1.5M)下冲击系数普遍超出规范限值。因此,在实际运营中严格管控车辆超速超载和确保桥面良好平整度对于保障此类空间异型拱桥的结构安全、耐久性及行车舒适性至关重要。
In order to investigate the dynamic response of vehicle bridge coupling in irregular tied arch bridges,this study delves into the vibration response characteristics and key influencing factors of vehicle bridge coupling.Based on the theory of vehicle bridge coupling vibration,a coupling system is established,which includes a 9-degree-of-freedom three axle heavy vehicle model and a finite element model of a special-shaped tied arch bridge.The reliability of the Midas Civil modelis verified through comparison and real bridge dynamic strain testing.The system analyzes the effects of vehicle speed(30-75km/h),deck roughness level(A-D levels),and vehicle load on the dynamic response of key parts of the bridge.The results indicate that the power response is particularly severe at speeds between 60-75 km/h,and resonance is prone to occur at specific speeds,exacerbating vibration.The reduction of road roughness level will increase the impact load of vehicles on bridges and the dynamic displacement of bridges.Compared with smooth road surfaces,D-grade unevenness leads to a 29.5%increase in the maximum dynamic displacement of the main beam mid span.The increase in vehicle weight will linearly increase the displacement response,and the impact coefficient under overweight conditions(1.5M)generally exceeds the specification limit.Therefore,strict control of vehicle speeding and overloading and ensuring good flatness of the bridge deck are crucial for ensuring the structural safety,durability,and driving comfort of such spatially irregular arch bridges in actual operation.
作者
刘舒阳
陈建兵
刘晨光
高姝昕
Liu shuyang;Chen Jianbing;Liu Chenguang;Gao Shuxin(School of Civil Engineering,Suzhou University of Science and Technology,Suzhou,Jiangsu 215011,China)
出处
《黑龙江工业学院学报(综合版)》
2025年第11期117-124,共8页
Journal of Heilongjiang University of Technology(Comprehensive Edition)
基金
国家自然科学基金项目(项目编号:52208189)。
关键词
桥梁工程
系杆拱桥
车桥耦合振动
路面不平顺
冲击系数
bridge engineering
cable-stayed arch bridge
vehicle-bridge coupling vibration
road roughness
impact coefficient
