方钢管约束高强混凝土短柱轴压力学性能

为研究方钢管约束高强混凝土短柱的轴压力学性能,进行了12个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宽厚比(D/t=47和70)和混凝土强度(C77和C88).试验结果表明,当D/t=70时,方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方钢管混凝土构件;而当D/t=47时,方钢管约束高强混凝土短柱的轴压承载力则低于普通方钢管混凝土构件;但两种构件的延性无显著差异.对构件的应力分析结果表明,方钢管约束高强混凝土轴压短柱中,钢管在峰值荷载点后屈服;而钢管混凝土构件中,钢管在峰值荷载点前屈服.方钢管约束混凝土构件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.

Axial compression of behavior square tube confined high strength concrete (HSC) short columns

To study the axial load behavior of square tube confined HSC short columns,12 specimens was tested under cyclic axial compression. Parameters in the tests are the width-to-thickness ratio of the steel tube (D/t 47 and 70) and the concrete compressive strength (C77 and C88). The experimental results indicate that the axial load strength of a steel tube confined concrete stub column is greater than that of a CFT column with the same parameters when D/t is 70, while the axial load strength of a square tube confined concrete stub column is less than that of a CFT column when D/t is 47. There is little difference on the ductility for the two kinds of stub columns. The results of the elastic-plastic analysis on the steel tube indicate that the steel yields after the peak load point for square tube confined concrete columns, while the steel yields before the peak load point for common square CFT columns. The confinement from the tube of square tube confined concrete columns is obviously higher than that from the tube of common square CFT columns.