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为研究设置加劲肋与增加壁厚对方钢管混凝土短柱承载力及延性的改善效果,在总用钢量不变前提下对无肋、单肋、双肋6个方钢管混凝土短柱进行了轴压试验,分析试件荷载-位移曲线、破坏特征和延性性能;同时采用ANSYS有限元软件对带肋方钢管混凝土短柱的荷载-位移曲线进行了计算,其结果与试验基本吻合。结果表明:设置加劲肋可延缓管壁的屈曲,增加试件的延性,但不能够提高试件的极限承载力;加劲肋宽厚比愈大,管壁的鼓屈发生越晚,对核心混凝土的约束效应愈低;同等壁厚条件下,单肋试件与双肋试件受力性能相当。
In order to study the improvement of the bearing capacity and the ductility of CFST short columns with stiffeners and increasing wall thickness, six kinds of CFST columns with no rib, single rib and double rib were made under the same total amount of steel. The load-displacement curves, failure characteristics and ductility of specimens were analyzed. The load-displacement curves of concrete filled CFST columns with ANSYS finite element software were also calculated. The results are in good agreement with the experimental results. The results show that the stiffener can delay the buckling of the pipe wall and increase the ductility of the test piece, but can not increase the ultimate bearing capacity of the test piece. The greater the stiffener stiffener ratio, the later the buckling of the pipe wall occurs. The lower the restraint effect is. Under the condition of the same wall thickness, the single-rib specimens and the double-rib specimens have equivalent mechanical properties.