薄壁矩形钢管混凝土受压柱临界宽厚比

对薄壁矩形钢管混凝土柱在轴压作用下的局部屈曲性能进行了研究。使用能量法分析了钢板的局部屈曲系数。假设钢管壁在非加载边受到弹性约束,在内侧受到混凝土的径向压力,通过计算弹性约束系数,得到了矩形钢管混凝土柱轴压下的临界宽厚比。从公式中得知径向力降低了钢管的屈曲应力。钢管屈曲系数随着约束系数的增大而增大,且与钢管截面高宽比和邻边厚度比有关。

Critical Width-to-Thickness Ratio of Concrete-Filled Rectangular Thin-Walled Steel Tube Columns Under Force Loading

The local buckling behavior of concrete-filled rectangular thin-walled steel tube columns under axial loading is presented, energy approach is used to calculate the local buckling coefficient of rectangular steel plate. Assumed that steel tube is subjected to elastic constraint at unloading edge and radial force provided by concrete inside, an elastically restraining factor is given and critical width-to-thickness ratio is got in the end. It is known that radial force reduces buckling stress of steel tube, buckling coefficient increases with the increase of restraining factor, and also is influenced by height-to-width ratio and thickness ratio.