约束砌体结构抗震性能试验研究及数值分析

发布时间：2019-04-18 06:14

【摘要】：近年来,我国地震频发,砖砌体房屋在地震中破坏严重,引起学者们的广泛关注。本文以带圈梁构造柱的砖砌体结构为研究对象,通过对一个缩尺比例为1/2的2层砖砌体结构模型进行拟静力试验,分析结构抗震性能,并采用有限元方法对砖砌体模型进行P-A分析,定量研究约束砌体结构承载力和延性性能的影响因素,为我国砌体结构设计提供参考。论文主要完成了以下三个方面的工作:(1)设计和制作缩尺比例为1/2的2层砖砌体结构模型,分析在低周往复加载下结构的破坏特征、构造柱纵筋的应变、滞回性能、耗能能力及骨架曲线等方面,评价结构的抗震性能。(2)采用ABAQUS建立试验模型的非线性空间数值模型,并对其进行P-△模拟加载,模拟结果与试验结果吻合较好,证明该有限元方法的有效性和合理性。(3)在试验数值模型的基础上,改变层数、楼层构造柱率、楼层墙率、层高等因素,研究各因素对砖砌体结构模型进行承载力和延性的影响,得到随墙率和构造柱的增大,模型承载力增大,而随着层数和层高的增大,承载力反而减小;墙率、层数、层高的变化与延性的延性变化呈负相关的关系,而构造柱率变化与延性变化呈正相关的关系;接着以一个两层砌体结构房屋为例,定量研究层数、楼层构造柱率、楼层墙率、层高等参数变化对砌体结构延性的影响,得到楼层墙率变化对延性系数变化影响最大,楼层构造柱率和层高变化次之,层数变化对延性系数变化的影响最小。
[Abstract]:In recent years, earthquakes occur frequently in our country, and brick masonry buildings are seriously damaged in earthquakes, which has attracted wide attention of scholars. This paper takes the brick masonry structure with ring beam structure column as the research object. Through the pseudo-static test of a two-story brick masonry structure model with a scale of 1 ~ 2, the seismic performance of the structure is analyzed. The influence factors of bearing capacity and ductility of confined masonry structure are quantitatively studied by using finite element method (FEM) to analyze brick masonry model in order to provide reference for the design of masonry structure in China. The main work of this paper is as follows: (1) designing and making a two-story brick masonry structure model with scale of 1 ~ 2, analyzing the failure characteristics of the structure under low cycle reciprocating loading, strain and hysteretic behavior of the longitudinal reinforcement of the structural column, and so on. The energy dissipation capacity and skeleton curve are used to evaluate the seismic performance of the structure. (2) the nonlinear spatial numerical model of the experimental model is established by using ABAQUS, and the simulation results are in good agreement with the experimental results, and the simulation results are in good agreement with the experimental results. The validity and rationality of the finite element method are proved. (3) on the basis of the experimental numerical model, the factors such as the number of floors, the ratio of floor structure columns, the ratio of floor wall, the height of story, etc., are changed. The influence of various factors on the bearing capacity and ductility of brick masonry structure model is studied. The results show that with the increase of wall ratio and structural column, the bearing capacity of the model increases, but with the increase of story number and height, the bearing capacity of the model decreases. The change of wall ratio, layer number and layer height has a negative correlation with ductility change, while the change of structural column rate has a positive correlation with ductility change. Then, taking a two-story masonry building as an example, the influence of the number of floors, the ratio of floor structural columns, the ratio of floor wall and the height of floor on the ductility of masonry structure is studied quantitatively. The results show that the change of floor wall ratio has the greatest influence on the ductility coefficient of masonry structure. The change of floor structure column ratio and floor height is the second, and the change of story number has the least effect on the change of ductility coefficient.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU352.11;TU364

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