基于桩-土作用效应的滚石撞击桥墩动力响应分析

滚石灾害会直接影响山区桥梁结构使用状况,甚至会导致桥墩偏位、落梁甚至造成整个桥梁发生坍塌。为了能更加真实的模拟滚石撞击桥墩这一动力过程,结合工程实例建立有限元模型,对碰撞动力学分析理论以及数值分析原理进行了介绍。运用LS-DYNA对不同滚石质量、不同滚石速度撞击桥墩时结构动力响应进行参数化分析,研究表明:滚石质量越大、速度越大对桥墩损伤产生的影响越显著。

Dynamic Response Analysis of Rolling Stone Impact Pier Based on Pile-soil Interaction Effect

The rolling stone disaster will directly affect the use of the bridge structure in the mountainous area, and even lead to the deviation of the bridge pier, the falling beam and even the collapse of the entire bridge. In order to simulate the dynamic process of rock-rock impact piers more realistically, this paper combines engineering examples to establish a finite element model, and introduces the theory of collision dynamics analysis and the principle of numerical analysis. The LS-DYNA is used to analyze the structural dynamic response of different rolling stone quality and different rolling stone speeds. The research shows that the greater the mass of the rolling stone and the higher the speed, the more significant the impact on the pier damage.