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为了比较较大长宽比(1.7倍)的矩形钢管混凝土柱与复式矩形钢管混凝土柱的轴压性能。本研究对矩形钢管混凝土柱与复式矩形钢管混凝土柱分别进行了轴压承载力试验,研究二者在破坏特征、受力状态、承载力以及延性的异同。试验结果表明:核心圆钢管改变了普通矩形钢管混凝土柱的内力分布,矩形钢管混凝土柱主要先是角部破坏,接着矩形截面长边发生凸鼓破坏,而复式矩形钢管混凝土在靠近端头的矩形截面短边发生凸鼓破坏。复式矩形钢管混凝土柱承载能力比普通钢管混凝土柱大12.5%,延性大4.9%。这表明复式矩形钢管混凝土柱比普通钢管混凝土柱具有更好的轴压性能。
In order to compare the axial compression properties of rectangular CFST columns and CFRC columns with large aspect ratio (1.7 times). In this study, the axial compressive bearing capacity tests of rectangular CFST columns and CFRC columns were carried out respectively to investigate the similarities and differences between the two in terms of failure characteristics, bearing conditions, bearing capacity and ductility. The experimental results show that the core steel tube changes the internal force distribution of ordinary rectangular concrete-filled steel tube columns. The rectangular CFST columns are mainly mainly damaged at the corners and then bulged in the long side of the rectangular section, whereas in the rectangular concrete filled rectangular tube, Short drum damage occurred. The carrying capacity of the double concrete-filled rectangular CFST column is 12.5% larger than ordinary CFST columns and the ductility is 4.9%. This shows that composite rectangular CFST columns have better axial compression properties than ordinary CFST columns.