带约束拉杆T形钢管混凝土短柱轴压性能的试验研究

摘要

介绍11个带约束拉杆和5个不带约束拉杆的T形钢管混凝土轴压短柱试件的试验研究,讨论在不同约束拉杆间距与直径、钢板厚度与屈服强度、截面尺寸下带约束拉杆T形钢管混凝土短柱的破坏特点、承载力、拉杆与钢管的应变特点等轴压性能。结果表明：约束拉杆的设置改变了钢管的屈曲模态,延迟钢管局部屈曲的发生,有助于T形钢管混凝土轴压短柱的承载力和延性的提高。采用现有规范或规程的计算公式对试件轴压承载力进行计算,对不同计算方法的适用性进行探讨。%The behavior of T-shaped concrete-filled steel tubular（T-CFT） stub columns subjected to axial compression was experimentally investigated,using 11 specimens with binding bars and 5 specimens without binding bars.The parameters under study are the spacing and diameter of binding bars,thickness and strength of steel plates,and section size.The axial bearing properties such as characteristics of failure,bearing capacity,characteristics of strain of the binding bars and the steel tube are discussed.The results indicate that setting binding bars results in the change of the buckling mode of the steel plates,the delay of local buckling of the steel tubes,and the increase of load carrying capacity and ductility of the specimens.The applicability of the methods in current specifications or codes for calculating the maximum bearing capacity of the specimens is discussed.