泥石流作用下钢筋混凝土框架结构的易损性评估模型

A model for vulnerability assessment for reinforced frame structures against debris flow

针对目前单沟泥石流灾害承灾体易损性评估定量化程度不高的问题,提出一种易损性计算方法。通过分析泥石流作用形式,建立了考虑承灾体弹塑性变形的计算模型。此外,应用有限元软件SAP2000模拟钢筋混凝土框架结构变形过程,确定了承灾体极限载荷。最后参考破坏等级标准计算易损性数值,并发现泥石流的作用高度、作用方向以及大石块冲击是影响泥石流冲击效果的重要因素。

Based on the situation that the quantitative degree of vulnerability assessment for bearing body caused by single debris flow is low,a calculation method of vulnerability assessment is presented. After analyzing action effects of debris flow,a calculation model that considering plastic elastoplastic deformation of bearing body is built. Besides,the FEM software SAP2000 is used to simulate the deformation process of a reinforced concrete frame structure to figure out the limit load. Finally,the numerical results of vulnerability are calculated according to the standards of damage classification and it is shown that the impact height,direction and impact of massive stone are the key factors of impact results.