CFRP-超薄壁圆钢管混凝土轴压短柱承载力的简化计算

基于合理的CFRP筒、钢管和核心混凝土在极限荷载时的应力状态的假设,采用极限平衡法并运用MatLab软件作为运算工具,推导出钢管壁厚小于2mm、径厚比大于120的CFRP-超薄壁圆钢混凝土轴压短柱的承载力计算表达式.结果表明:相对于普通的CFRP-钢管混凝土短柱,CFRP-超薄壁圆钢管混凝土轴压短柱的钢管套箍指标被折减,其承载力有所降低.通过对9个构件的轴心受压试验表明,计算表达式的计算值与试验值吻合良好.

The bearing capacity of CFRP-super thin-wall round steel tube concrete axial compression short column simplified calculation

Based on the reasonable hypothesis of the stress state under the ultimate load of the CFRP tube , steel tube and the core concrete ,using the limit equilibrium methods and taking the MatLab as the computa-tional tool ,we inferred the computational expressions of the bearing capacity of the CFRP-super thin-wall round steel tube concrete axial compression short column witch with the steel tube wall thickness less than 2 mm ,and radius-thickness ratio more than 120 .The calculation results shows that ：compared with the com-mon CFRP-concrete filled steel tubular short column ,the steel tube’s confinement index of the CFRP-super thin-wall round steel tube concrete axial compression short column was discounted ,and the bearing capacity was reduced .The axial compression test of nine specimens indicates that the calculation result from the com-putational expressions can match well with the test result .