桥梁上部结构碰撞的破坏模式与载荷计算技术研究

Study on Failure Mode and Load Calculation Technology of Bridge Superstructure Collision

针对桥梁上部结构碰撞的破坏模式和载荷计算技术进行了研究。建立车辆碰撞桥梁的有限元基本模型,确定车辆和桥梁的有限元仿真本构模型。以7类工况为研究对象,对桥梁的破坏模式进行分析。研究基于简化模型的桥梁碰撞过程载荷计算方法。结果表明,桥梁支座形式、桥梁的结构不是影响碰撞过程中载荷力大小的主要因素。而碰撞冲量、桥梁位移量和破坏模式是造成桥梁发生损坏的决定因素。

In this paper,the failure mode and load calculation technology of bridge superstructure collision are studied.The basic finite element model of vehicle impacting bridge is established,and the finite element simulation constitutive model of vehicle and bridge is determined.Then the failure modes of the bridge under seven kinds of working conditions are analyzed,and the load calculation method of the bridge collision process based on the simplified model is studied.It is concluded that the form of bridge support and bridge structure are not the main factors affecting the magnitude of load in the process of collision.Collision impulse,bridge displacement and failure mode are the decisive factors for bridge damage.