大长细比钢管混凝土轴心受压柱承载力的试验研究

EXPERIMENTAL STUDIES ON THE BEHAVIOR AND STRENGTH OF VERY SLENDER CONCRETE FILLEDSTEEL TUBULAR COLUMNS

进行了12个钢管混凝土和4个空铜管轴心受压构件的试验研究．研究结果表明，由于填充了混凝土，可以有效地延缓钢管的局部屈曲，从而使钢管混凝土长柱具有较高的承载力．通过试验结果表明，对于长细比为130～155的钢管混凝土柱，《钢-混凝土组合结构设计规程》（DL5058／T）中有关承载力计算公式的计算结果与实测结果相比偏于保守，浇灌混凝土以后，钢管混凝土构件的承载力较空钢管可提高30％左右．

The behavior of concrete filled steel tubular(CFST) columns and circular steel tubular columns subjected to axially loading was experimentally investigated. A total of fifteen specimens including eleven CFST columns and four vacant steel tube columns were studied. Experimental results indicate that the concrete infill delays the development of local buckling of the steel tube and thin increasing its compressive load. The loading capacity of the CFST column can be conservatively predicted by using the 《Deign Code for Steel-Concrete composite Structures DL5058/T》. The ultimate strength of concrete filled steel tubular columns is about 30 percent higher than those vacant steel tubular columns.