基于ANSYS的简支梁车-桥-支座耦合动力响应分析

Analysis of Vehicle-Bridge-Support Coupling Dynamic Response of Simply Supported Beam Based on ANSYS

为准确模拟车辆过桥产生的振动,应考虑支座弹性作用的影响。结合分离法与汽车动力学原理,分别建立车辆、桥梁和支座的计算模型并通过位移协调关系和力的平衡关系进行车-桥-支座耦合。基于ANSYS中APDL语言,以30 m简支箱梁桥为算例研究桥面不平整度、支座刚度和阻尼对车-桥-支座耦合动力响应的影响。结果表明,桥面平整度越差,车辆行驶过程中对桥梁产生的冲击力越大,激发桥梁的动力响应越剧烈;适当增大支座刚度能有效降低桥梁动挠度,减弱振动响应;支座阻尼具有耗能作用,增大支座阻尼对削弱桥梁加速度响应有明显的效果;在设计桥梁支座时,应适当增大支座刚度和阻尼来削弱车-桥-支座耦合振动对桥梁的冲击作用。

In order to more accurately simulate the vibration generated by vehicles crossing the bridge,the influence of the elastic action of the bridge support should be considered.Combining the separation method and the principle of vehicle dynamics,the calculation models of the vehicle,bridge and support were respectively established,and the vehicle-bridge-support coupling was carried out through the displacement coordination relationship and the force balance relationship.Based on the APDL language in ANSYS,taking a 30 m simply supported box girder bridge as an example,the effects of bridge deck irregularity,support stiffness and damping on vehicle-bridge-support coupling dynamic response were studied and analyzed.The results show that the worse the flatness of the bridge deck,the greater the impact force on the bridge during the driving process of the vehicle,and the more severe the dynamic response of the bridge.Appropriately increasing the support stiffness can effectively reduce the dynamic deflection of the bridge and weaken the vibration response.The support damping has the effect of energy dissipation,and increasing the support damping has a significant effect on weakening the acceleration response of the bridge.When designing the bridge support,the stiffness and damping of the support should be appropriately increased to weaken the impact of the vehicle-bridge-support coupling vibration on the bridge.