L形无孔钢板连接式方钢管混凝土组合异形柱长柱轴心受压极限承载力试验研究

EXPERIMENTAL INVESTIGATION OF THE AXIAL COMPRESSION BEARING CAPACITY OF SLENDER L-SHAPED COLUMN COMPOSED OF CONCRETE-FILLED STEEL TUBES CONNECTED BY STEEL PLATES

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。

Four L-shaped columns composed of concrete-filled steel tubes connected by steel plates（ LCFST columns） were tested under axial compression to study the effects of slenderness ratios. Similar to the square concrete-filled steel tubular columns,the axial compression bearing capacity of LCFST columns decreased with the increase of slenderness ratios and their failure modes also differed with the variation of the slenderness ratios. Based on the lateral displacement and the strain distribution of LCFST columns,it was believed that the whole specimen bended around X＇- X＇ which was with an angle of 45 degree from the X- X axis. In addition,after analyzing the strain distribution of the connection plates,it was convinced that the connection plates made some contributions to the axial compression bearing capacity of LCFST columns.