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开展了钢管混凝土哑铃形截面构件的约束扭转试验,以试验为基础建立了有限元模型,并进行了哑铃形截面抗扭承载力计算公式的推导并利用有限元加以验证,研究结果表明:钢管混凝土哑铃形截面构件表现出较好的扭转弹塑性性能;提高腹腔宽度可较为显著地提高哑铃形构件的抗扭性能;但腹腔高度的增加对于提高构件抗扭承载力并不明显;哑铃形截面抗扭承载力为钢管和腹腔钢板、管内混凝土、腹腔混凝土三部分抗扭承载力之和,其中腹腔混凝土所占的比重在5%以下,在计算抗扭承载力时可以忽略,以此推导并简化的抗扭承载力计算公式,可以较为简便、准确地计算钢管混凝土哑铃形截面的抗扭承载力。
The torsional torsional test of CFST dumbbell-shaped cross-section members was carried out. The finite element model was established based on the experiment. The calculation formula of torsional torsional bearing capacity of dumbbell section was deduced and verified by finite element method. The results show that: Dumbbell-shaped cross-section members showed better torsional elasto-plastic properties; increasing the abdominal cavity width could significantly improve the torsional resistance of dumbbell-shaped members; however, the increase of abdominal height was not obvious to improve the torsional bearing capacity of the members; dumbbell- The torsional bearing capacity is the sum of the torsional bearing capacity of steel pipe, abdominal steel plate, pipe concrete and celiac concrete. The proportion of celiac concrete below 5% can be neglected when calculating the torsional bearing capacity to derive and simplify Torsion bearing capacity of the formula can be more simple and accurate calculation of ductile concrete filled steel tubular torsional load-bearing capacity.