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为研究带约束拉杆方形钢管混凝土短柱的恢复力特性,进行了2个不带约束拉杆和8个带约束拉杆方形钢管混凝土短柱试件在低周反复荷载作用下的试验研究。基于Open Sees纤维截面建立带约束拉杆方形钢管混凝土短柱的纤维模型,并对其滞回性能进行计算,数值分析结果与试验结果吻合较好,在模型得到验证的基础上,进一步考虑了轴压比、钢管壁厚、混凝土抗压强度、钢管屈服强度、约束拉杆间距、长细比等因素对骨架曲线的影响,基于分析结果,回归分析得出带约束拉杆方形钢管混凝土短柱的恢复力模型。结果表明:在研究参数范围内提出的恢复力模型与试验结果吻合较好。
In order to study the restoring force characteristics of concrete-filled square steel tube short columns with restraining tie bars, two unconfined tie rods and eight concrete-filled square steel tube columns with constrained tie rods under low cyclic loading were tested. Based on the Open Sees fiber cross-section, a fiber model of square concrete-filled steel tubular column with restraining rod was established and its hysteretic behavior was calculated. The results of numerical analysis are in good agreement with the experimental results. Based on the verification of the model, The influence of the factors such as concrete wall thickness, concrete wall thickness, compressive strength of concrete, yield strength of steel pipe, restraining rod spacing and slenderness ratio on the skeleton curve was analyzed. Based on the analysis results, the restoring force model of concrete filled square steel tube column with restraining rod . The results show that the restoring force model proposed in the research parameters agree well with the experimental results.