为研究双面聚合物砂浆聚丙烯网面层加固砖墙的抗震性能，进行了6个试件的低周反复加载试验，变化参数包括有无聚丙烯网、不同加固材料、有无黏结构造和加固面数。获得了试件的破坏形态和滞回曲线，分析了试件的承载能力、延性、刚度退化、耗能能力等抗震性能。结果表明：双面聚合物砂浆聚丙烯网面层加固砖墙在低周反复荷载作用下发生的是剪摩破坏+弯曲破坏，滞回曲线饱满，延性好，耗能能力强，抗震性能优于单面聚合物砂浆聚丙烯网加固砖墙；聚丙烯网在加固中作用显著，能够极大提升加固砖墙的抗震性能；与传统加固方法相比，双面聚合物砂浆聚丙烯网面层加固方法对砖墙耗能能力改善最显著，对延性和初始刚度提高较大；未采用黏结构造的加固砖墙尽管没有发生加固面层与砖墙之间的黏结破坏，但其抗震性能相对较差。最后，根据试验结果进行了效费比分析，与传统加固方法相比，双面聚合物砂浆聚丙烯网面层加固方法基于砖墙承载能力、延性、耗能能力和极限位移角的效费比均较高，可推广应用于砌体结构的抗震加固，尤其是经济不发达的农村地区。
Abstract
In order to study the seismic performance of brick wall reinforced with double-side polypropylene mesh-polymer mortar face, low cyclic reversed loading tests were carried out on 6 specimens. The variable parameters included with or without polypropylene mesh, different reinforcing material, with or without adhesive constructional measure and reinforcing sides. The failure patterns and hysteretic curves of specimens were obtained, and the seismic performance, such as bearing capacity, ductility, stiffness degradation and energy dissipation were analyzed. Test results showed that for the brick wall reinforced with double-side polypropylene mesh-polymer mortar face under low cyclic reversed loading, the shear friction failure and bending failure occurred, the hysteretic curve was full, the ductility was good, the energy dissipation capacity was strong, and its seismic performance was better than that of the brick wall reinforced with single-side polypropylene mesh-polymer mortar face. The polypropylene mesh had significant action in the reinforcing, which could improve the seismic performance of the reinforced brick wall greatly. Compared with traditional reinforcing methods, the double-side polypropylene mesh-polymer mortar face reinforcing method could made the energy dissipation capacity of the brick wall enhance the most greatly, and the ductility and initial stiffness increase significantly. The reinforced brick wall without adhesive constructional measure had no adhesive failure between the reinforced face and the brick wall, but had the worse seismic performance. Finally, the efficiency-cost ratio analysis was conducted based on test results. Compared with traditional reinforcing methods, the efficiency-cost ratio of the double-side polypropylene mesh-polymer mortar face reinforcing method were superior according to the bearing capacity, ductility, energy dissipation capacity and ultimate drift ratio of the reinforced brick wall. It can be seen that the double-side polypropylene mesh-polymer mortar face reinforcing method can be applied to the seismic reinforcement of masonry structures, especially in the rural areas with low economic level.
关键词
砌体结构 /
砖墙 /
聚合物砂浆聚丙烯网面层 /
抗震加固 /
效费比
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Key words
masonry structure;brick walls /
polypropylene mesh-polymer mortar face /
seismic reinforcement /
efficiency-cost ratio
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