T形方钢管混凝土组合异形柱偏压性能试验研究

T形方钢管混凝土组合异形柱具有良好的力学性能，以试件长度、偏心距、偏心方向为试验参数，设计9个不同长细比的试件进行偏心受压试验，观察试件的破坏形态，得到荷载-应变曲线和荷载-挠度曲线，并分析各参数对试件偏心受压性能的影响。试验结果表明：长度为600 mm的试件发生了强度破坏，长度为1 500、1 800 mm的试件发生了弯曲失稳破坏；试件长度越长，弯曲破坏特征越明显；偏心距越大，偏压承载力越低；偏心方向对偏心受压性能的影响相对较小。与相关规范计算结果对比发现，按DBJ/T 13-51—2010计算的结果与试验结果吻合最好。研究结果表明，T形方钢管混凝土组合异形柱延性较好，方钢管之间可以协同工作，偏心受压力学性能良好。

Experimental study on the behavior of special T-shaped composite columns with concrete-filled square steel tubulars under eccentric loads

The special T-shaped composite columns with concrete-filled square steel tubulars have good mechanical properties. Taking the length, eccentricity and eccentricity direction of the specimen as the test parameters, nine specimens with different slenderness ratio are designed for eccentric compression test. By observing the failure mode of the specimen, the load-strain curve and load-deflection curve are obtained, and the influence of each parameter on the eccentric compression performance of the specimen is analyzed. The test results show that the strength of 600 mm long specimens is damaged. The specimens with lengths of 1 500, 1 800 mm are broken by bending instability; the longer the specimen length is, the more obvious the bending failure characteristics are; the larger the eccentricity is, the lower the eccentric bearing capacity is; the eccentricity direction has a relatively small impact on the eccentric compression performance. It is found that compared with the calculation results of relevant specifications, the results calculated by DBJ / T 13-51-2010 are in good agreement with the test results. The ductility of special T-shaped composite columns with concrete-filled square steel tubulars is well, the square steel tubes can work together, and the eccentric compression performance is good.