方钢管赤泥混凝土黏结滑移性能试验研究

Experimental Research on the Bond-slip Behavior of Red Mud Concrete Filled Square Steel Tubes

制作了15个方钢管赤泥混凝土短柱试件进行推出试验,获得了方钢管赤泥混凝土的荷载-滑移曲线,研究了赤泥替代率、混凝土强度、长径比(埋置长度)、宽厚比对方钢管赤泥混凝土黏结滑移性能的影响。研究结果表明,方钢管赤泥混凝土荷载-滑移曲线经历了5个阶段,即无滑移段、上升段、下降段、二次上升段、二次下降段。黏结极限荷载随赤泥替代率的提高先增加后降低,赤泥替代率为5%时,黏结极限荷载达到最大;赤泥替代率为20%时,黏结极限荷载与标准钢管混凝土相当。黏结极限荷载随混凝土强度及长径比的增加而增加;随宽厚比的增加而减小。

Fifteen red mud concrete filled square steel tubes short column specimens were designed for the push-out test, and the load-slip curves of red mud concrete filled square steel tubes were obtained, and the effects of the replacement rate of red mud mass, concrete strength, length diameter ratio(embedment length), width to thickness ratio on the bond slip behavior of the steel stubs were studied. The results show that the load slip curves of red mud concrete filled square steel tubes can be classified into five stages: no slipping, ascending, descending, reascending and redescending.The bond ultimate load increases first and then decreases with the increase of red mud substitution rate. When the substitution rate of red mud is 5%, the bond ultimate load reaches the maximum. When the substitution rate of red mud is 20%, the bond ultimate load is equivalent to that of normal concrete filled steel tube. The bond ultimate load increases with the increase of the concrete strength and the length-diameter ratio, and decreases with the increase of the width-thickness ratio.