拉结筋加固砌体结构抗震研究

发布时间：2018-07-09 11:21

本文选题：砌体结构 + 抗震加固　；参考：《北方工业大学》2017年硕士论文

【摘要】：在我国部分村镇地区依然存在大量没有经过抗震设计的普通砖砌体房屋,一旦在地震中破坏倒塌,极大的威胁人民群众的财产生命安全。随着经济社会的发展,出现并发展了多种针对砖砌体结构的抗震加固方法,拉结筋加固是一种有效的加固方法,该方法能够减少对房屋正常使用的影响,但拉结筋加固对砖砌体结构整体性能的影响有待进一步研究。本文尝试将普通砖砌体房屋数值模拟与模型试验结果进行对比,在此基础上对拉结筋加固的砌体房屋进行全面地数值模拟研究。本文以某高校学生公寓改造工程为实例,选取该学生公寓走廊一侧两个宿舍为原型,开展了以下研究内容:1、以1:2比例缩尺建立了未采取抗震设防措施的双层双开间砖砌体房屋模型。对砖砌体试验模型进行了 6度罕遇地震作用下的拟动力试验,得到了试验模型的位移、恢复力响应;进行低周反复加载试验得到了试验模型的滞回曲线、骨架曲线和刚度退化曲线,并研究了模型裂缝开展和破坏情况。2、使用ABAQUS软件建立与试验模型尺寸一致的砖砌体结构数值模型,对其进行地震作用时程分析和低周反复加载,并将地震作用和拟静力模拟结果与试验结果进行了对比分析,验证了该模型参数及本构模型的选取。3、在ABAQUS模型基础上,模拟采用拉结筋加固的模型,通过拉结筋使轴压比分别增加0.1～0.4。对不同轴压比的加固模型进行7度罕遇地震作用下的时程分析,获得了加固模型的位移、加速度反应并进行对比;进行低周反复加载试验模拟,得到了加固模型的极限承载力、极限位移、骨架曲线和刚度退化曲线。结果表明采用拉结筋加固的砖砌体房屋在7度罕遇地震作用下抗震性能较好,加固模型比未加固房屋的极限承载力、延性有明显提升,并且随轴压比增大效果增加,增加0.2～0.3的轴压比时增强效果最为明显,增加的轴压比超过0.4时效果已不明显。
[Abstract]:There are still a large number of ordinary brick masonry buildings without seismic design in some villages and towns of our country. Once destroyed and collapsed in the earthquake, the lives of people's property are threatened greatly. With the development of economy and society, a variety of seismic reinforcement methods for brick masonry structures have emerged and developed. Tensile reinforcement is an effective reinforcement method, which can reduce the impact on the normal use of buildings. However, the effect of tensile reinforcement on the overall performance of brick masonry structure needs further study. This paper attempts to compare the numerical simulation of ordinary brick masonry building with the results of model test, and on the basis of this, makes a comprehensive numerical simulation study on the masonry building strengthened with tensile reinforcement. In this paper, two dormitories on one side of the hallway of the college apartment are selected as the prototype, taking the renovation project of a college student apartment as an example. In this paper, the following research content: 1 is carried out, and the model of double-decked brick masonry building without seismic fortification measures is set up with the 1:2 scale. The pseudo-dynamic test of brick masonry test model under the action of 6 degrees rare earthquake is carried out, and the displacement and restoring force response of the test model are obtained, and the hysteretic curve of the test model is obtained by low-cycle repeated loading test. The skeleton curve and stiffness degradation curve, and the crack development and failure of the model are studied. The numerical model of brick masonry structure consistent with the size of the test model is established by Abaqus software, and the seismic time history analysis and low cycle repeated loading are carried out on the model. The seismic action and pseudostatic simulation results are compared with the experimental results, and the parameters of the model and the selection of the constitutive model are verified. The model of tension and reinforcement is used in the simulation on the basis of Abaqus model. The axial compression ratio is increased by 0.1% and 0.4% respectively. The time history analysis of the reinforcement model with different axial compression ratio under the action of 7 degrees rare earthquake is carried out, and the displacement and acceleration responses of the reinforcement model are obtained and compared, and the ultimate bearing capacity of the strengthening model is obtained by the simulation of low cycle repeated loading test. Limit displacement, skeleton curve and stiffness degradation curve. The results show that the brick masonry buildings strengthened with tensile reinforcement have better seismic performance under the rare earthquake of 7 degrees, and the ultimate bearing capacity and ductility of the strengthening model are obviously improved than that of the unstrengthened buildings, and the effect increases with the increase of axial compression ratio. The enhancement effect is the most obvious when the axial pressure ratio of 0.2% is increased, but the effect is not obvious when the axial pressure ratio is more than 0.4.
【学位授予单位】：北方工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU352.11;TU364

【参考文献】