The numerical investigation of depth to flange width ratio (h/bf) in the stress distribution on cold-formed steel beam

Abstract

Refer to the thin element of cold-formed steel elements, the phenomenon of local buckling and post-buckling be a serious concern on structures. Thin elements undergo local buckling before melting stress while receiving a bending load, tension/compression, or shear around the support. The instability of local buckling caused the post-buckling on structures. Unlike ordinary hot-rolled, cold-formed steel structures normally buckle before yielding but the compression elements do not collapse despite buckling. The additional load could be supported by the elements after buckle through the stress distribution. Post-buckling strength can be several times greater than the force caused by the local buckling critical stress. On the effectiveness width approach, it is assumed that the total loads are supported by the fictitious width bf experiencing at uniformly maximum stress. In this paper, the flexural buckling behavior of cold-formed steel is investigated by numerical modeling using a finite element analysis of software. A Thin element with a ratio of depth (h) to width (bf) great could cause a local buckling element. Local buckling of elements accumulates causing post-buckling structure, which works simultaneously with torque. The h/bf ratio of 3 has better resistance to buckling elements than it of 2.