复式空心钢管混凝土柱抗压刚度

Compressive stiffness of composite concrete-filled steel tube(CCFST)

将复式钢管混凝土空心柱分成混凝土、内钢管和外钢管三部分,将其作为拟平面轴对称问题进行分析,考虑混凝土和内、外钢管的径向位移、纵向应变协调,建立了复式钢管混凝土空心柱抗压刚度计算公式,并得到了复式空心钢管混凝土柱在轴力作用下的应力分配比。同时分析了核心混凝土泊松比、内钢管泊松比、外钢管泊松比、内钢管壁厚、外钢管壁厚对复式空心钢管混凝土柱的抗压钢管和应力分配比的影响,得到了复式空心钢管混凝土柱轴压应力不是按弹性模量比分配、内外层钢管壁厚和泊松比对彼此无显著影响等结论。

Composite concretefilled steel tube is divided into three parts: core concrete, inner steel tube and outer steel tube.As a pseudo planar problem, it was analyzed by elastic axisymmetrical method.Based on the compatibility of radial displacement and longitudinal strain,its compressive stiffness was derived, and the stress distribution ratios of core concrete, inner steel tube and outer steel tube were presented. The influence of core concrete Poisson's ratio、inner steel tubular Poisson's ratio、outer steel tubular Poisson's ratio、inner steel tubular thickness、outer steel tubular thickness on both compressive stiffness and stress distribution ratio was discussed. It is pointed out that the stress distribution ratios are not determined by elastic modulus, the thickness and Poisson's ratio of inner steel tube and outer steel tube do not influence each other greatly.