墙体开洞影响下房屋砖砌体结构地震易损性分析

Seismic Vulnerability Analysis of Brick Masonry Structures with Wall Openings

摘要:

为获取可靠的墙体开洞影响下房屋砖砌体结构地震易损性分析结果，采用ABAQUS有限元分析软件构建房屋砖砌体结构墙体模型，设置合理的墙体模型参数和数值模拟参数；对比模拟数值与以往研究的测试值，证明所构建模型参数取值合理；将截取的峰值段江油地震波作为上述模型的地震动输入，根据测得的房屋砖砌体结构的力学变化数据，分析房屋砖砌体结构的地震易损性。分析结果表明：地震情况下，随着墙体开洞率的增加，墙体荷载能力下降、墙体水平承载力增长幅度降低、墙体相对刚度退化率增加；墙体开洞数量越多，房屋砖砌体结构侧向刚度下降越快。因此分析得出墙体开洞率大、墙体开洞数量多，房屋砖砌体结构的地震易损性越显著。

Abstract:

To study the seismic vulnerability of brick masonry structures with openings in their walls, we used ABAQUS finite-element-analysis software to construct a model of the walls of a brick masonry structure, and established reasonable wall-model and numerical-simulation parameters. Comparing our simulated values with the test values obtained in previous research, we verified that the model parameter values were reasonable. Using measured mechanical change data, we analyzed the earthquake vulnerability of a brick masonry structure. The analysis results show that with increases in the number of wall openings, the load capacity of the wall decreases, the horizontal bearing capacity increases, and the relative degradation rate of the wall stiffness increases. The more openings there are in a wall, the faster the lateral stiffness of the brick masonry structure decreases. Therefore, the seismic vulnerability of a brick masonry structure is more obvious as the number of wall openings increases.