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为研究高轴压比下焊接环式高强复合箍筋约束高强混凝土柱的破坏形态、极限承载力、裂缝发展过程及发展规律,对9个1/2模型的焊接环式高强复合箍筋约束高强混凝土柱和1个1/2模型的普通非闭合箍筋约束的高强混凝土柱进行低周反复水平加载试验。试验表明:焊接环式高强复合箍筋约束高强混凝土柱的裂缝发展比较缓慢;随着轴压比的增大,核心区混凝土弯曲裂缝出现滞后,受压区的竖向裂缝增多;配箍率相同的情况下,随着轴压比的增大,极限荷载略有下降;该类柱表现出理想的弯曲破坏模式。
In order to study the failure mode, ultimate bearing capacity, crack development process and development law of high-strength concrete columns restrained by high-axial-compression composite stirrups under high axial compression ratio, 9 ½ model welded high-strength composite stirrups constrained by high strength Concrete columns and a 1/2 model of ordinary non-closed stirrup constrained high-strength concrete columns for low cycle repeated horizontal loading test. The results show that the cracks of high-strength concrete columns confined by welded ring-type high-strength composite stirrup tend to develop more slowly. With the increase of axial compression ratio, the bending cracks of concrete in core area lag and the vertical cracks in compression zone increase. The ultimate load decreases slightly with the increase of axial compression ratio. The columns show the ideal bending failure mode.