初应力对钢管混凝土哑铃形轴压短柱受力性能影响的试验研究

进行了有初应力的钢管混凝土哑铃形轴压短柱试件的试验研究,分析探讨了初应力对其力学性能的影响及其极限承载力的计算方法.分析结果表明,初应力使弹塑性阶段提前、弹性极限荷载降低,同时峰值极限荷载推迟出现,构件切线刚度降低.但初应力对钢管混凝土哑铃形轴压短柱的峰值极限荷载影响很小,可以采用与无初应力构件相同的方法计算.

Experimental research on influence of initial stress to behavior of concrete filled steel tubular dumbbell shaped stub columns under axial loads

Experimental research on CFST dumbbell shaped columns with initial stresses subjected to axial loads are carried out. Influence effects of initial stress to its behaviors and ultimate load-carrying capacity are analyzed. Analyses results indicate that initial stress make elastic-plastic phase appear ahead and decrease the tangent rigid and elastic ultimate load. However, the initial stresses have almost no influence to the ultimate load-carrying capacity of the member, so it can use the same method to predict the ultimate load of dumbbell shaped CFST short column with initial stress as that in that without initial stress.