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为了研究薄板混凝土组合截面部分外包组合柱(弱轴)的滞回性能,对3个薄板混凝土组合截面部分外包组合柱(弱轴)足尺试件在恒定轴压下进行了水平低周反复荷载试验,观察了加载过程中薄壁板件翼缘局部屈曲和混凝土裂缝开展与压溃现象,得到了试件的荷载-位移滞回曲线。根据试验结果分析了试件的承载力、抗侧刚度、延性与耗能、破坏模式等力学性能。结果表明:试件具有较好的变形能力和耗能能力;试件的破坏模式为柱脚部位混凝土压溃和拉结筋屈服甚至拉断,随之薄壁板件翼缘发生局部屈曲。研究进一步丰富了薄板混凝土组合截面部分外包组合柱研究成果,为该类柱设计规范的制订和工程应用提供了理论依据和技术储备。
In order to study the hysteretic behavior of some of the composite columns (weak axis) of thin-walled concrete composite sections, three full-length composite columns (weak shafts) Experiments were conducted to observe the local buckling of the flanges and the crack initiation and collapse of the thin-walled plate during the loading process. The load-displacement hysteretic curves of the specimens were obtained. According to the test results, the mechanical properties such as bearing capacity, lateral rigidity, ductility and energy dissipation, failure mode and so on were analyzed. The results show that the specimen has good deformation ability and energy dissipation capacity. The failure mode of the specimen is that the concrete at the column foot is crushed and the yield strength is even pulled off, and then the local buckling of the flange of the thin-walled plate occurs. The research further enriches the research results of some of the outsourcing composite columns with thin-section concrete composite sections, and provides theoretical basis and technical reserve for the formulation and engineering application of such columns.