圆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 circular steel tubes filled with red mud concrete

为了研究圆钢管赤泥混凝土黏结滑移性能,考虑赤泥替代率、混凝土强度、长径比(埋置长度)、径厚比4个变化参数,制作了15个圆钢管赤泥混凝土短柱试件进行推出试验,得到了圆钢管赤泥混凝土的荷载-滑移曲线,并对变化参数的影响进行分析。结果表明:圆钢管赤泥混凝土荷载-滑移曲线经历3个阶段,即无滑移段、上升段、下降段;黏结极限荷载随赤泥替代率提高先增加后降低,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,随径厚比的增加而减小。

Fifteen short column circular steel tubes filled with red mud concrete were designed for the push-out test to study the bond slip behavior of red mud concrete-filled circular steel stubs,taking into account the four variable parameters including replacement rate of red mud mass,concrete strength,length diameter ratio(embedment length),and length-diameter ratio.The load-slip curves of circular red mud concrete-filled steel tubes were obtained and the influence of the variable parameters were analyzed.The results showed that the load slip curves of red mud concrete filled circular steel tubes went through three stages:no slipping section,ascending section,descending section.The bond ultimate load increased first and then decreased with the rise of red mud substitution rate.When the substitution rate of red mud was 5%,it reached the maximum load.When the substitution rate of red mud was 20%,the bond ultimate load was equivalent to normal concrete-filled steel tube.The bond ultimate load increased with the rise of the concrete strength and length-diameter ratio,and decreased with the increase of the width-thickness ratio.