受撞桥梁结构撞击力仿真分析研究

摘要

The bridge superstructure will have been lots of loss when impacted by the over-high truck. In order to grasp the situation of loss for the bridge structure, we need to determine the collision load. This paper bases on the simulation model to research the collision load which caused by the car-bridge collision. The simulation model built by the Ansys/Ls-dyna to analysis the value and variation for the collision load when the over-high truck impact the bridge structure in different quality and velocity. This work get through the multi-parameter curve fitting to obtain the collision load formula for the impact bridge, compare results of this paper with the relevant literatures about the value of collision load to test the formula adapting to calculate the collision load, thus, giving the reference to the relevant design and consolidate.%桥梁上部结构受到超高车辆撞击时会产生很大的损伤.为了掌握结构的损伤情况,需要确定撞击力的大小.本文基于仿真模型对超高车辆撞击桥梁上部结构的撞击力进行研究.采用Ansys/Ls-dyna软件建立有限元模型,分析不同车重、速度下的撞击力大小和变化规律.通过多参数曲线拟合获取受撞桥梁结构撞击力的计算公式,并与国内外相关文献资料的结果进行比较,验证了拟合公式的可靠性,从而为相关工程设计及加固提供参考.