【摘要】 为研究高强冷弯矩形钢管混凝土(CFHCST)短柱在轴向荷载作用下的承载力,以钢管壁厚、钢材强度和截面尺寸3个不同参数进行实验.实验记录相关破坏现象,并分析试件荷载-位移和荷载-应变曲线在不同参数下的变化.结果表明:CFHCST短柱在承受轴向荷载时,实验过程主要描述弹性、弹塑性和破坏3个阶段,其与普通钢管混凝土短柱的工作机理大致相同;宽厚比的取值越小,构件的延性越低,但核心混凝土受到外部钢管的约束作用增大,且构件的极限承载能力也得到提高;长宽比越小,构件延性越低,但构件承载力增强;随着钢材强度的提高,构件极限承载力提升较为明显,但构件延性却降低.更多还原

【Abstract】 The mechanical properties of Concrete-filled high-strength cold-formed steel tube(CFHCST) short column was studied under axial load for 3 parameters, including the wall thickness of the tube, the strength of the steel and the dimensions of the section. The damage in the experiment, the variation of load-displacement curve and load-strain curve under different parameters were analyzed. The results show that the experimental process of CFHCST short column under axial load is divided into three stages, namely the mainly elastic, elastic-plastic and broken stages, which is similar to the common steel tube short column. As the ratio of width to thickness decreases, the ductility of the specimen decreases, but the confinement of the steel tube to the core concrete increases, and the ultimate bearing capacity also increases. As the aspect ratio decreases, the ductility of the specimen decrease,and the bearing capacity increases.As the strength of steel increases,the ultimate bearing capacity increases obviously,but ductility decreases.更多还原