密置焊接高强复合箍筋约束高强混凝土柱的试验

在低周反复荷载作用下,对9根焊接环式箍筋约束高强混凝土柱以及1根绑扎环式箍筋约束高强混凝土柱进行试验.通过对比研究试件的破坏过程以及实验的结果,分析了配箍率、轴压比对混凝土柱约束的影响.各个构件的滞回曲线和骨架曲线表明:在高轴压比下的复合焊接环式箍筋均有较好、较饱满的滞回曲线,体现了其具有良好的延性和抗震性能;在同等条件下焊接环式箍筋对混凝土的约束作用要比绑扎的好;在一定配筋范围内,随着钢筋配筋率的增加,混凝土柱承受低周反复承载的能力、屈服强度有所提高,滞回曲线饱满,包络面积增大,延性提高.

Experiment on the Stirrup Restrain Effect of High-Strength Concrete Columns with Welding Ring Stirrups under High Axial Load Ratio

The experiment was conducted to investigate 9 high-strength concrete columns with welding ring stirrups and 1 high-strength concrete columns with binding ring stirrup under the low cyclic loading. Based on the failure process of specimen and the experimental results, the influence of stirrup ratio, axial compression ratio on confined concrete column was analyzed. The hysteretic curves and skeleton curves of components shows the hysteretic curves of columns with the high axial compression ratio is more plump under the welding ring stirrups, indicating the good ductility and seismic resistant performance. The welding ring stirrups can confine the concrete more efficiently than the binding ring under the same condition. With increasing the stirrup ratio in a certain range, the concrete columns have better low cyclic bearing capacity, yield strength, plump hysteretic curve, envelope area and ductility.