落石冲击下设不同缓冲层混凝土板的有限元分析

Finite Element Analysis of Concrete Slabs with Different Buffer Layers under Rockfall Impact

随着山区经济的飞速发展,大量基础设施在山区投入使用。为了保护山区重要建筑物使其免受落石灾害影响,提出在重要建筑物的钢筋混凝土屋面板上设置一定的缓冲层。通过缓冲材料的缓冲作用将部分冲击效果缓冲消耗掉,从而达到使直接作用于钢筋混凝土屋面板上的冲击效应有所降低的目的。由于落石冲击能量大,冲击时间短暂,涉及结构大变形和复杂的能量转换关系,因而研究落石冲击下缓冲结构的动力响应就具有一定的难度。本文以简化后钢筋混凝土屋面板结构为研究对象,采用ANSYS/LS-DYNA动力有限元分析软件对落石冲击加缓冲材料的钢筋混凝土板的作用过程进行了数值仿真模拟,研究落石从不同高度下落冲击几种加不同缓冲材料的钢筋混凝土板的动力学响应,为落石防护工程设计提供参考。

With the rapid economic development in mountainous areas,a lot of infrastructure has been put into use in mountainous areas.In order to protect important buildings in mountainous area from rockfall disaster,a buffer layer is put forward on reinforced concrete roof panels of important buildings.Part of the impact effect is consumed by the cushioning effect of the cushioning material,so as to reduce the impact effect directly acting on the reinforced concrete roof slab.It is difficult to study the dynamic response of buffer structure under rockfall impact because of its large energy and short impact time,large deformation of structure and complex energy conversion relationship.This paper takes the simplified reinforced concrete roof slab structure as the research object,and uses ANSYS/LS-DYNA dynamic finite element analysis software to conduct numerical simulation on the action process of reinforced concrete slab with rockfall impact and buffer material,and studies the dynamic response of several reinforced concrete slabs with different buffer materials when rockfall impact from different heights.It provides reference for the design of rockfall protection engineering.