内置钢板聚合物砂浆面层加固砖砌体抗震性能试验研究

发布时间：2018-10-17 22:16

【摘要】：砌体结构有成本低、材料来源广泛、耐久性好、施工方便等优点。初步统计,砌体结构占我国各类房屋建筑结构的80%以上。但砌体结构的抗拉、抗弯、抗剪能力低,因而抗震性能差,导致砌体结构在地震中损坏严重。为提升砌体结构的抗震性能,本文提出一种新型抗震加固方法:内置钢板聚合物砂浆面层加固法。砌体结构在地震中破坏多为抗剪强度不足,墙体发生剪切破坏。为模拟墙体在地震作用下的破坏形态,本试验采用四连杆机构加载。本文考虑了两个影响因素:砂浆强度(M1、M2.5、M5、M7.5)和加固形式(正交加固、斜撑加固),共计12片墙体,包括对比未加固墙、正交加固墙和斜撑加固墙。对墙体进行低周反复拟静力试验,详细描述试验过程,并对破坏形态进行分析。对比荷载与位移、延性系数、骨架曲线、刚度退化曲线、能量耗散系数等抗震性能指标,综合分析加固墙的抗震性能。试验数据表明,该加固方法是可行的,能大幅度提升墙体的抗震性能。加固墙的破坏形态得到明显地改善,呈现明显的三阶段破坏,最终破坏时墙体不会垮塌。不同强度的砌筑砂浆对斜撑加固墙的极限荷载影响不大。斜撑加固法对M1墙的加固效果更为突出,而其余墙体下斜撑加固法的效果较正交加固法有提高,但提高幅度不大。该加固法为砖砌体结构的抗震加固提供了新的解决方案,是一种可大范围推广的加固方法。
[Abstract]:Masonry structure has the advantages of low cost, wide source of materials, good durability and convenient construction. Preliminary statistics show that masonry structures account for more than 80% of all kinds of building structures in China. However, the tensile, flexural and shear resistance of masonry structures is low, so the seismic performance of masonry structures is poor, resulting in serious damage to masonry structures in earthquake. In order to improve the seismic performance of masonry structure, a new method of seismic strengthening is presented in this paper: the method of strengthening polymer mortar surface layer with built-in steel plate. The failure of masonry structure in earthquake is mostly due to insufficient shear strength and shear failure of wall. In order to simulate the failure pattern of the wall subjected to earthquake, the four-bar linkage was used in this experiment. In this paper, two influencing factors are considered: mortar strength (M _ (1) M _ (2. 5) M _ (5) M _ (7.5) and reinforcement form (orthogonal reinforcement, diagonal bracing reinforcement). The total number of walls is 12, including comparative unstrengthened wall, orthogonal strengthened wall and inclined braced reinforcement wall. The low-cycle pseudo-static test was carried out on the wall, the test process was described in detail, and the failure pattern was analyzed. The seismic performance of strengthened walls is analyzed by comparing the seismic performance indexes such as load and displacement ductility coefficient skeleton curve stiffness degradation curve and energy dissipation coefficient. Experimental data show that the reinforcement method is feasible and can greatly improve the seismic performance of the wall. The failure form of the strengthened wall is obviously improved, showing obvious three-stage failure, and the wall will not collapse at last. Masonry mortar with different strength has little effect on ultimate load of inclined braced reinforced wall. The reinforcement effect of inclined bracing method on M1 wall is more prominent, while the effect of the other methods is better than that of orthogonal reinforcement method, but the improvement range is not significant. This reinforcement method provides a new solution for seismic strengthening of brick masonry structure and is a kind of reinforcement method which can be popularized in a wide range.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU364;TU352.11

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