型钢-方钢管自密实高强混凝土轴压短柱受力性能的试验研究

提出了一种重载柱设计的模式,即型钢-方钢管自密实高强混凝土柱。该组合柱是在方钢管中填充自密实高强混凝土和型钢而形成。通过13根型钢-方钢管自密实高强混凝土短柱的轴心受压试验,研究了该组合柱的受力性能。试验结果表明自密实试件与经过振捣的试件的受力性能几乎没有差别;型钢的存在有效地延缓或抑制了高强混凝土中剪切裂缝的产生从而提高了构件的延性;混凝土强度、方钢管的宽厚比和型钢的用量对构件的强度和延性有着显著影响。最后给出了型钢-方钢管自密实高强混凝土轴心受压短柱强度承载力的计算公式,计算结果与试验结果吻合良好。

Experimental study on axially loaded square steel tubes filled with steel-reinforced self-consolidating high-strength concrete

A new design model of steel-concrete composite columns for bearing heavy load has been presented in this paper, that is the steel-reinforced self-consolidating high-strength concrete filled square steel tube columns. In this type of composite columns, structural steel section is inserted into the steel tube and self-consolidating high-strength concrete is filled into the void between them. Thirteen composite columns were tested under axial compression. The experimental results showed that the behavior of self-consolidating columns and vibrated columns are almost the same; the encased structural steel section effectively delays or restrains the generation of shear sliding crack in high-strength concrete and therefore the ductility of the columns is improved; concrete strength, width-to-thickness ratio and the area of encased structural steel section have significant effects on the bearing-capacity and ductility of the columns. Finally, the formula for predicting the strength of the composite columns is proposed. The calculated values agree well with the experimental results.