带竖向构造钢筋再生混凝土砖砌体抗震性能

Seismic Performance of RAC Brick Masonry Walls With Vertical Constructional Reinforcements

提出了带竖向构造钢筋的再生混凝土砖砌体结构.为研究带竖向构造钢筋再生混凝土砖砌体的抗震性能,进行了8个不同高宽比、不同墙体厚度的带竖向构造钢筋的再生混凝土砖砌体与无竖向构造筋再生混凝土砖砌体抗震性能比较试验研究.试件分为4组:第1组墙厚为260 mm,高宽比为0.6,1个带竖向构造钢筋,1个无竖向构造钢筋;第2组墙厚为260 mm,高宽比为1.0,1个带竖向构造钢筋,1个无竖向构造钢筋;第3组墙厚为390mm,高宽比为0.6,1个带竖向构造钢筋,1个无竖向构造钢筋;第4组墙厚为390 mm,高宽比为1.0,1个带竖向构造钢筋,1个无竖向构造钢筋.各试件的轴压比为0.2,采用低周反复荷载加载.基于试验,对比分析了各试件的承载力、刚度及其退化过程、延性与耗能、破坏特征,给出了带竖向构造筋再生混凝土砖砌体的承载力计算公式,计算结果与实测符合较好.研究表明:带竖向构造钢筋的再生混凝土砖砌体与无竖向构造筋的再生混凝土砖砌体相比,承载力、延性、耗能能力显著提高.

The recycled aggregates concrete （RAC） brick masonry structure with vertical constructional reinforcement was proposed and has been patented by the State Intellectual Property Office of China. In order to study the seismic performance of the structure, the experimental study of eight RAC brick wall models with different height to width aspect ratio, different wall thickness and with or without vertical constructional reinforcements, had been carried out. The test models were divided into 4 groups ： the first group included two wall models with the same wall thickness 260 mm and the same height to width aspect ratio 0.6, constructed with or without vertical constructional reinforcements; the second group included two wall models with the same wall thickness 260 mm and the same height to width aspect ratio 1.0, constructed with or without vertical constructional reinforcements; the third group included two wall models with the same wall thickness 390 mm and the same height to width aspect ratio 0.6, constructed with or without vertical constructional reinforcements; the fourth group included two wall models with the same wall thickness 390 mm and the same height to width aspect ratio 1.0, constructed with or without vertical constructional reinforcements. The models were tested under cyclic loading with the axial force ratio 0.2. The load-bearing capacity, stiffness and stiffness degradation, ductility and energy dissipation capacity, and failure characteristics of the models were comparatively analyzed according to the tests. The load-bearing capacity formula of the RAC brick walls were proposed in this paper and the load-bearing capacity of the RAC brick walls calculated by the formula were in good agreement with the experiment results. The results show that compare to the RAC brick masonry wails without vertical constructional reinforcements, the walls with vertical constructional reinforcements show better seismic performance, in that the load-bearing capacity, the ductility and the seismic energy dissipation capacity were improved greatly.