圆钢管约束高强混凝土短柱的轴压力学性能

为研究圆钢管约束高强混凝土短柱的轴压力学性能,进行6个短柱试件在循环轴压荷载作用下的试验研究.试验中的主要参数为钢管径厚比(26和42).试验结果表明,圆钢管约束高强混凝土短柱的轴压承载力高于同条件的普通钢管混凝土构件,但两种构件的延性无显著差异;随钢管中纵向应力的降低,构件的轴压承载力提高.对构件的应力分析结果表明,圆钢管约束高强混凝土轴压短柱中,钢管对核心混凝土的约束效果高于普通钢管混凝土构件;钢管约束高强混凝土轴压短柱的峰值荷载点对应于钢管的屈服点.

Behavior of circular tube confined high strength concrete (HSC) short columns under axial compression

To study the behavior of circular tube confined HSC stub columns,6 specimens were tested under cyclic axial compression.The tested parameter is the diameter-to-thickness ratio of the steel tube(26 and 42).The experimental results indicate that the axial load strength of a circular tube confined concrete stub column is greater than that of a CFT column with the same parameters,while there is little difference on the ductility of the two kinds of columns.The axial load strength of the columns increases as the longitudinal stress of the steel tube decreases.The results of the elastic-plastic analysis on the steel tube indicate that the confinement from the tube of circular tube confined concrete columns is obviously higher than that of the tube of common circular CFT columns.The steel tube yields at the peak load point for circular tube confined concrete short columns under axial compression.