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试验设计4组共8个格构式钢骨-钢管混凝土柱和圆钢管-混凝土柱,其中2个短柱(L=500 mm)、2个中长柱(L取1 500 mm)、4个长柱(L取2 500、3 500 mm)试件。通过对钢骨-钢管混凝土柱进行轴压试验,考虑格构式钢骨和长细比两个变化因素,观察各试件受力过程及破坏形态,测得荷载-应变和荷载-位移关系曲线,并分析两个变量对试件承载力的影响规律。研究结果表明:钢骨-钢管混凝土柱受力过程均经历弹性阶段、屈服阶段和破坏阶段,破坏形态主要有材料强度破坏和弹塑性失稳破坏;格构式钢骨架对试件承载力有一定提高;长细比对钢骨-钢管混凝土试件承载力影响较大,随着长细比增加,试件承载力明显降低。此外采用AISC规范和欧洲规范4的相关计算公式计算钢骨-钢管混凝土柱承载力,计算结果表明规范公式均相对保守。因此,建议的格构式钢骨-钢管混凝土轴压柱的承载力设计公式,能较为准确地预测钢骨-钢管混凝土柱承载力。
Experimental design Four groups of eight steel-concrete-filled steel tubular columns and concrete-filled steel tubular columns were constructed. There were 2 short columns (L = 500 mm), 2 long columns (1 500 mm for L) Long column (L take 2 500,3 500 mm) specimen. Through the axial compression test of steel-concrete-filled steel tube columns, considering the two factors of variation of the slender steel and the slenderness ratio, the stress process and failure mode of each specimen were observed. The curves of load-strain and load- , And analyzed the influence of two variables on the bearing capacity of the specimen. The results show that the stress of steel-concrete-filled steel tubular columns undergone elastic stage, yield stage and failure stage, the failure modes are mainly the failure of material strength and the failure of elastoplastic instability; ; Slenderness ratio has a great influence on the bearing capacity of steel-concrete-filled steel specimens, and as the slenderness ratio increases, the bearing capacity of specimens decreases obviously. In addition, the bearing capacity of steel-concrete-filled steel tubular columns with AISC code and the relevant formula of European Code 4 was calculated. The calculation results show that the standard formulas are relatively conservative. Therefore, the proposed design formula of the bearing capacity of steel-reinforced concrete column-concrete filled steel tubular columns can predict the bearing capacity of steel-concrete-filled steel tubular columns more accurately.