Steel pipe bearing capacity
It has an impact on the strength and stability of the steel pipe (overall stability). When the steel pipe is strained, its failure is strength failure, and the design value of axial tension it can bear is: N=A*f, where: A is the section area of steel pipe, and f is the design value of steel strength. The reduction of steel pipe wall thickness inevitably leads to the reduction of the section area of steel pipe, which leads to the reduction of the axial tension value of steel pipe. When the steel pipe is under pressure, its failure is stability failure, the design value of the pressure it can bear is: N=φ*f*A, where: φ is the overall stability coefficient of the steel pipe, according to its slenderness ratio can be checked by the attached table of the steel structure design code, the calculation formula of the slenderness ratio is: λ=l/i, l is its calculated length, i is the radius of rotation of the section, due to the reduction of steel tube wall thickness, inevitably lead to the reduction, because i=sqrt(I/A), here I is the steel tube section moment of inertia, A is the section area, so due to the reduction of the wall thickness, resulting in the increase of the slenderness ratio, resulting in the reduction of stability coefficient φ, Finally, the design value of stable bearing capacity is reduced. In general, the reduction of wall thickness has a greater effect on the bearing capacity under compression than that under tension.
