方钢管混凝土柱在轴压下的局部屈曲

Local buckling of concrete-filled square steel tubular column subject to axial compression

假定方钢管混凝土柱的钢管板件在非加载边受到弹性约束,建立横向位移函数是三角函数条件下钢管壁板的局部屈曲模型.应用能量法推导轴压下钢管混凝土柱的钢管管壁的局部屈曲临界应力的计算公式.以非加载边弹性约束系数分别为2.0和∞为例进行计算.计算结果表明:核心混凝土的存在大大提高钢管管壁抵抗局部屈曲的能力.

Assuming that the steel plate of concrete-filled square steel tubular column was subjected to elastic constrain at the unloaded edge, a local buckling model of steel plates was built up on condition that the function of transverse displacement was trigonometric function. The formulae for calculating local buckling critical stress of the steel plate of concrete filled steel tubular column subjected to axial compression were derived by using energy approach. Taking 2. 0 and infinity as the coefficient of elastic constrain at the unloaded edge, the calculation was performed. It was shown by the result that the steel plates were restrained by the concrete core, improving remarkably the ability of steel plate to resist local buckling.