公路简支梁桥在车辆荷载作用下的动力响应分析

把车辆和桥梁看作两个分离的子系统,分别应用d’Alembert原理和有限元法建立它们的振动微分方程,通过两个子系统之间的位移协调条件和相互作用力相等的原则将车辆和桥梁的振动微分方程耦合起来.利用有限元软件ansys的二次开发APDL语言编写了求解车桥耦合系统振动微分方程的命令流,以路面随机不平顺为激振源,进行了车桥耦合系统动力响应的计算,研究了路面不平顺及车辆参数对桥梁动力响应的影响.计算结果表明,路面等级、车速、车辆悬架刚度、车辆悬架阻尼对桥梁结构动力响应的影响明显;车重、轮胎阻尼、轮胎刚度的影响次之.

Analysis on Dynamic Responses of Highway Simply Supported Beam Bridge Subjected to Vehicular Load

The bridge and vehicle were taken as two separate subsystems,and the vibration differential equations of vehicle and bridge were respectively derived by d＇Alembert theory and finite element method.The differential equations of two subsystems were coupled by the conditions of geometric compatibility and the theory of force equilibrium.Considering the excitation due to road random roughness,the command stream,which was compiled by APDL language for secondary development in ansys,was used to calculate the dynamic responses of vehicle-bridge system and the influences of different kinds of factors such as road roughness and the parameters of vehicle-bridge system were analyzed.The results indicated that the dynamic responses of vehicle-bridge system were sensible to road roughness,vehicle velocity,the stiffness and damping of vehicle suspension system;the influences of vehicle weight,tire damping and tire stiffness occupied the secondary position.