钢管混凝土哑铃形偏压构件试验研究

EXPERIMENTAL STUDY OF CONCRETE-FILLED STEEL TUBULAR DUMBBELL SHAPED COLUMNS UNDER ECCENTRIC LOADS

进行了8 根钢管混凝土哑铃形短柱的偏压试验。试验参数为偏心率。试验结果表明,钢管混凝土哑铃形偏压短柱受力性能与单圆钢管混凝土偏压柱的有相似之处。对极限承载力的计算表明,现有的折算面积法偏于保守而格构式算法又偏于不安全。提出的修正的格构式算法与试验结果吻合良好且偏于安全,可供工程应用参考。

Experiments of 8 concrete-filled steel tube (CFST) dumbbell-shaped columns under eccentrically loads are introduced. The load eccentricity ratio is taken as the experimental parameter. The test results indicate that the behavior of CFST dumbbell shaped eccentrically-loaded columns is similar to that of CFST single tubular specimens. The analyses of the ultimate load-carrying capacity show that the predicted results by the equivalent area method are too conservative and those obtained from truss method are larger than the test results. The predicted ultimate load by a modified truss method proposed in this paper agrees well with the test results. The modified truss method is shown to be safe and promising in engineering practice.