单体滑坡灾害承灾体的有限元模拟与易损性评估

Finite Element Simulation and Vulnerability Assessment for Bearing Body Caused by Single Landslide

针对目前单体滑坡灾害承灾体易损性评估定量化程度不高的问题,提出了一种承灾体易损性计算方法。在分析滑坡运动过程和承灾体破坏机制的基础上,引进塑性铰的概念,考虑了承灾体塑性变形过程,建立了简化计算模型。应用有限元软件SAP2000对钢筋混凝土框架结构受侧向力形变过程进行数值模拟,所得受力与位移参数代入简化计算模型,得到易损性数值并确定了承灾体破坏等级。结果表明:建筑物弹塑性变形与局部塑性铰变形过程类似,且塑性阶段所占比例较大;计算所得安全距离92.7m和承灾体易损性V为1时距离69.7m与实际基本相符。

The vulnerability assessment for bearing body caused by single landslide is not highly quantitative. In view of this, we present a calculation method for the vulnerability of bearing body. On the basis of analyzing the process of landslide movement and the failure mechanism of bearing body, we introduced the plastic hinge concept and took plastic deformation process of bearing body into consideration to build a simplified calculation model. Fur- thermore, we simulated the deformation process of a reinforced concrete frame structure under the action of side force by using FEM software SAP2000, hence obtaining parameters of force and displacement for the simplified cal- culation model, and finally acquired the vulnerability results and classified the damage degree of the bearing body. Results show that the elastic-plastic process of building is similar to that of local plastic hinge, and the plastic process takes up a large proportion. The calculation results of safety distance 92.7m and distance 69.7m（ V = 1 ） are consistent with practical data.