【作者】 余志武； 贺飒飒；

【Author】 YU Zhi-wu HE Sa-sa (Civil and Architecture College,Central South University,Changsha 410075,China)

【机构】 中南大学土木建筑学院；

【摘要】 试验对1组方钢管混凝土短柱试件,以及5组内约束方钢管混凝土短柱轴心受压构件进行了研究. 主要研究参数为内约束布置形式、间距和配箍率等.结果表明,内约束能有效改善钢管对核心混凝土的约束作用,延迟钢管因局部屈曲而导致构件的过早破坏,从而使方钢管混凝土轴压短柱的承载力和延性均有较大幅度的提高.此外,不同的内约束形式、不同的间距和配箍率对改善方钢管对混凝土的约束作用的贡献也有所不同.根据现有规范及规程有关方形钢管混凝土承载力以及约束混凝土承载力计算公式,提出了内约束方形钢管混凝土轴压试件的承载力计算公式,公式的计算结果与试验结果吻合良好.带有内约束形式的方钢管混凝土能使钢材与混凝土两种材料更好的协同工作,对发挥材料性能、节约材料很有意义.更多还原

【Abstract】 The behavior of square concrete -filled tubular steel (CFT) stub columns under axially loading is experimentally investigated.1 group of common concrete-filled tubular steel stub columns and 5 groups with inside- constraints are included.The main parameters are characteristics of inside -constraints,the distance in hoop steel and stirrups ratio.The result shown that the inside-constraints can improve the constrained problem the tubular done to core concrete,delay the partial buckling of steel tube,which always resuh in ear- ly destruction of columns.The ultimate bearing capacity and the ductility of square CFT stub columns are all improved with the inside -constraints in.Different inside -constraints characteristics make different effects on the improvement.A formula is proposed to calculate the ultimate bearing capacity of square CFT stub columns with inside-constraints,the calculated results fit well with the experiment.The inside- constraints square CFT have better interactive work of steel and concrete.更多还原