基于桩-土作用的山区桥梁滚石撞击结构动力响应分析

Dynamic Response of Rolling Stones Impact in Mountain Area Based on Pile-Soil Interaction

采用大型通用显式动力学软件ANSYS/LS-DYNA及HJC损伤本构关系建立了基于桩-土作用的滚石撞击桥墩三维有限元模型,模拟了滚石在不同因素下撞击桥墩的动力响应.研究表明:HJC材料本构关系能够很好地模拟钢筋混凝土桥墩在滚石撞击下的损伤状况,滚石撞击桥墩时桥墩结构损伤以局部损伤为主;桥墩的动力响应随滚石质量的增大而增大;滚石撞击位置对结构位移动力响应影响很大.

Based on the large-scale universal explicit dynamics software ANSYS/LS-DYNA and HJC damage constitutive relation, a three-dimensional finite element model of the rolling stole impact pier based on pile-soil interaction was established, and the dynamic response of the rolling stone under different factors was simulated. The research shows that the constitutive relation of HJC material can simulate the damage of reinforced concrete pier under the impact of rolling stone;when the rock impacting pier is damaged, the damage of the pier is mainly local damage;the dynamic response of the pier increases with the increase of the quality of the rolling stone;the impact position of the rolling stone has a great influence on the structural displacement dynamic response.