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对18个改进组合式T形钢管混凝土柱进行静力试验,分析钢管厚度、混凝土强度和长细比对试件轴压性能的影响,采用国内外钢管混凝土规范对试件轴压承载力进行计算,并与试验结果对比分析,最后在规范AIJ-CFT:1997的基础上,提出了改进组合式T形钢管混凝土柱轴压承载力计算式。结果表明:试件主要呈现出剪切型破坏、局部鼓曲(或开裂)以及弯曲失稳三类破坏形态;钢管厚度对试件轴压承载力影响较大,而且试件长细比越大,钢管厚度对试件轴压承载力的影响就越显著;随着混凝土强度等级由C30提高到C50,试件轴压承载力有所提高,提高幅度基本在15%左右;当钢管厚度较小时,长细比对试件轴压承载力影响较大;采用各国现行规范计算的轴压承载力均偏于保守;提出了考虑钢管约束效应的轴压承载力计算式,其计算结果与试验结果吻合较好。
The effects of concrete thickness, concrete strength and slenderness ratio on the axial compressive properties of the specimens were analyzed. The axial compressive bearing capacity of the specimens was calculated by using the concrete filled concrete filled steel tubular specimens at home and abroad , And compared with the test results. Finally, on the basis of the standard AIJ-CFT: 1997, the formula for calculating the axial compressive bearing capacity of the composite T-shaped CFST columns is put forward. The results show that the specimens mainly show three kinds of failure modes: shear failure, local buckling (or cracking) and bending failure. The thickness of the steel pipe greatly affects the axial compressive bearing capacity of the specimen, and the greater the slenderness ratio , The more significant the influence of the thickness of the steel tube on the axial compressive load capacity of the specimen; as the concrete strength level increased from C30 to C50, the axial compressive bearing capacity of the specimen has been increased by about 15%; when the thickness of the steel pipe is small , And the slenderness ratio has a great influence on the axial compressive bearing capacity of the specimens. The axial compressive bearing capacity calculated by the current national norms is biased to be conservative. The calculation formula of axial compressive bearing capacity considering the restraint effect of steel tubes is proposed. The calculation results and the test results Good agreement.