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对4根具有不同长细比的无孔钢板连接式方钢管混凝土组合异形柱长柱进行轴压试验研究。结果表明:与单根方钢管混凝土柱相似,无孔钢板连接式钢管混凝土组合异形柱的极限承载力随着长细比的增大而减小,其破坏形态也随着长细比的变化而不同。由试验得到的异形柱的侧向挠度值及应变分布规律可知,试件绕着与X-X轴呈45°的X’-X’轴发生整体失稳破坏;通过对连接钢板的应变分析得到,连接钢板参与了整个异形柱的受力。
The axial compression tests of four special-shaped columns with different slenderness ratios were carried out. The results show that the ultimate bearing capacity of CFST with non-perforated steel plate decreases with the increase of slenderness ratio, and its failure mode also changes with the slenderness ratio different. According to the lateral deflection values and the strain distributions of the special-shaped columns tested, it can be seen that the whole instability of the specimen occurs around the X’-X ’axis at 45 ° to the XX axis. By analyzing the strain of the connecting steel plate, Steel involved in the entire special-shaped column force.