中强地震下建筑结构动力弹塑性损伤模型研究

A Dynamic Elastoplastic Damage Model of Building Structures under Moderate and Strong Earthquakes

摘要:

抗震性能是建筑设计中的一项重要指标，需要对地震作用下的建筑结构动力弹塑性损伤情况进行分析。提出一种中强地震下建筑结构动力弹塑性损伤模型研究方法。从有效应力与Cauchy应力张量、建筑材料损伤演化方程等方面对弹塑性损伤模型基本原理进行分析，以此为理论基础，分析建筑材料应变率与建筑结构损伤能释放率的相关关系，通过Bonora损伤模型获取失效建筑材料损伤指数，并计算整体建筑结构构件损伤指数，以建筑材料损伤指数和建筑结构构件损伤指数为依据，完成中强地震下的建筑结构动力弹塑性损伤模型构建。利用实例进行分析，地震加速度值为0.3g的情况下，该模型的建筑结构相对位移时程曲线与实际位移曲线拟合度较高，且具有较好的建筑结构动力弹塑性损伤模拟精度，表明该模型具有一定的可行性。

Abstract:

The anti-seismic performance is an important index in building design; therefore, analyzing the elastoplastic damage of a building structure under earthquake is necessary. In this paper, an elastic-plastic damage model of building structures under moderate and strong earthquakes is proposed. The basic principle of the elastic-plastic damage model is analyzed from the aspects of the effective stress, the Cauchy stress tensor, and the damage evolution equation of building materials. Based on this, the relationship between the strain rate of the building material and the damage energy release rate of the structure is analyzed. The damage index of failure of a building material is obtained through the Bonara damage model, and the damage index of the building structural component is calculated. On this basis, the dynamic-plastic damage model of the building structure under moderate and strong earthquakes is constructed. When the seismic acceleration value is 0.3g, the relative displacement time history curve of the building structure is fitted with the actual displacement curve, and the dynamic elastic-plastic damage simulation accuracy of the building structure is good. The results show that the model is feasible to a certain extent.