带肋T形钢管混凝土短柱力学性能研究

Mechanical behavior of T-shaped concrete-filled steel ribbed tubular short columns

对5个不同加肋方式和2个无肋的T形钢管混凝土轴压短柱试件进行了试验研究,考察了加肋形式对T形钢管混凝土短柱力学性能的影响。试验结果表明：设置加劲肋提高了T形钢管混凝土轴压刚度和轴压承载力;考虑施工难度、材料成本、承载力提高等因素,试件TR-2的加肋形式最优。采用有限元软件ABAQUS对试件的荷载-变形全过程曲线进行了计算,同时对钢管壁应力、钢管与核心混凝土之间相互作用力进行对比分析。结果表明：总体上计算结果与试验结果吻合较好,T形钢管混凝土设置加劲肋能有效延缓钢管壁向外的局部鼓曲,改善钢管壁的稳定性,所有试件在钢管角部的截面约束效应明显,而全贯通加肋试件在加肋处的截面约束效应也比较明显。

Five specimens with different rib forms and two specimens without rib were studied to examine the influence of rib form on the mechanical properties of concrete-filled steel tubular short columns. The results show that using stiffening rib can improve the axial compressive stiffness and capacity. Considering the factors such as construction, material cost and bearing capacity increase, the rib form of specimen TR-2 is the optimal. The load-deformation curves of specimens were calculated by finite element software ABAQUS. The whole stressing process of steel tube and the interaction between steel tube and core concrete were analyzed. The calculation results are in good agreement with the test results. Using stiffening ribs can effectively delay local buckling of the steel tube and improve the stability of the steel tube wall. All specimens exhibit obvious constraint effect at steel tube corners. The whole ribbed specimens show an better constraint effect at the ribbed locations.