Research on Vehicle-Bridge Coupling Vibration Response of Long-Span Continuous-Rigid Frame System Based on SIMPACK

随着交通运输业的快速发展，大跨连续–刚构体系桥在路网中的应用日益广泛。然而，车辆与桥梁之间的耦合效应会对桥梁结构的安全性、耐久性以及车辆行驶的舒适性产生重要影响。本文基于多体动力学(MBD)与有限元分析(FEA)方法，在SIMPACK软件中建立车辆多体动力学模型，并结合ANSYS软件建立大跨连续–刚构体系桥有限元模型，开展车桥耦合仿真分析。结果表明：单车通过五跨连续–刚构体系桥梁时，各跨跨中的竖向位移时程响应关于中跨跨中对称。路面不平度对车桥耦合振动具有显著影响，桥梁的冲击系数随不平度等级的增大而逐渐增大，在B级路面不平度激励下行车舒适性随车速增加而逐渐降低；冲击系数在部分计算工况将超过规范限值。With the rapid development of the transportation industry, the application of long-span continuous-rigid frame bridge in the road network is becoming more and more extensive. However, the coupling effect between the vehicle and the bridge will have an important impact on the safety and durability of the bridge structure and the comfort of the vehicle. In this paper, based on multi-body dynamics (MBD) and finite element analysis (FEA) methods, a vehicle multi-body dynamics model is established in SIMPACK software, and a finite element model of a long-span continuous-rigid frame system bridge is established in combination with ANSYS software to carry out vehicle-bridge coupling simulation analysis. The results show that when the bicycle passes through the five-span continuous-rigid frame system bridge, the vertical displacement time history response of each span is symmetrical about the middle span of the middle span. The road roughness has a significant effect on the vehicle-bridge coupling vibration. The impact coefficient of the bridge gradually increases with the increase of the roughness level, and the driving comfort gradually decreases with the increase of the vehicle speed under the B-level road roughness excitation. The impact coefficient will exceed the standard limit in some calculation conditions.