外圆内方中空夹层钢管混凝土柱轴压性能分析

文中以外钢管的径厚比及内钢管的宽度与外钢管的直径之比(简称宽径比)作为设计变量,分析外圆内方中空夹层钢管混凝土柱在轴向荷载作用下的力学性能。试验结果表明,构件的破坏形态可分为两种,即与核心区混凝土剪切破坏有关的局部屈曲和双钢管的局部屈曲。构件的轴向承载能力取决于上述两种破坏形态。与其他因素相比,宽径比对破坏形态的影响程度较大。此外,本文还分析了内外钢管在平面应力状态下的双轴弹塑性受力性能,并提出计算外圆内方中空夹层钢管混凝土柱的轴向承载力的方法。

PERFORMANCE ANALYSIS OF CONCRETE FILLED DOUBLE SKIN STEEL TUBULAR COLUMNS WITH OUTER CIRCULAR AND INNER SQUARE SECTIONS UNDER AXIAL COMPRESSION

In this paper, the mechanical properties of concrete filled double skin steel tubular (CFDST) columns with outer circular and inner square sections under axial load are analyzed. The diameter-to-thickness ratio of outer tube and inner width to outer diameter ratio are chosen as the design variable. The experimental result shows that the destructive patterns of the components can be divided into two types, local buckling related to the shear failure of concrete in the core area and local buckling of outer and inner steel pipes. As the result shows, the axial bearing capacity of CFDST columns depends on the above two types of damage patterns. Compared with other factors, the inner width to outer diameter ratio has a greater influence on the damage pattern. In addition, the biaxial elastoplastic behavior of inner and outer steel tubes under plane stress state is also analyzed, and the method for calculating the axial bearing capacity of hollow-walled concrete-filled steel tubular columns inside the outer circle is proposed.