摘要
In order to investigate the effect of vehicle-bridge coupling on the dynamic characteristics of the bridge,a steel-concrete composite beam suspension bridge is taken as the research object,and a three-dimensional spatial model of the bridge and a biaxial vehicle model of the vehicle are established,and then a vehicle-bridge coupling vibration system is constructed on the basis of the Nemak-βmethod,and the impact coefficients of each part of the bridge are obtained under different bridge deck unevenness and vehicle speed.The simulation results show that the bridge deck unevenness has the greatest influence on the vibration response of the bridge,and the bridge impact coefficient increases along with the increase in the level of bridge deck unevenness,and the impact coefficient of the main longitudinal girder and the secondary longitudinal girder achieves the maximum value when the level 4 unevenness is 0.328 and 0.314,respectively;when the vehicle speed is increased,the vibration response of the bridge increases and then decreases,and the impact coefficient of the bridge in the middle of the bridge at a speed of 60 km/h achieves the maximum value of 0.192.
为了探究车桥耦合作用对桥梁动力特性的影响,以某钢-混组合梁悬索桥为研究对象,首先构建了桥梁三维空间模型和车辆的双轴整车模型,然后基于Nemak-β法建立了车桥耦合振动系统,最后得到了不同的桥面不平整度、车速状态下桥梁各部位的冲击系数.仿真试验结果表明,桥面不平整度对桥梁的振动响应影响最大,桥梁冲击系数随着桥面不平整度等级的提高而增大,4级不平整度时主纵梁和次纵梁冲击系数取得最大值,分别为0.328和0.314;车辆速度提升时,桥梁的振动响应先增大后减小,车速60 km/h时桥梁跨中冲击系数取得最大值0.192.
出处
《吉首大学学报（自然科学版）》
CAS
2024年第5期45-51,共7页
Journal of Jishou University(Natural Sciences Edition)
基金
National Natural Science Foundation of China(11572001,51478004)
2021 Undergraduate Course Ideological and Political Demonstration Course-Theoretical Mechanics(108051360022XN569)
2022 Great Innovation Project-Frame Bridge Structural Engineering Research(108051360022XN388)。
