Buckling analysis of space frames using experimental and numerical techniques

Abstract

In this paper, the study of the buckling modes and the effective length of bars in steel welded space frames has been carried out experimentally and numerically using FEM based software. A 3D model of the under-slung bridge has been used for the experimental and numerical study. The bridge model has been designed in such a way that buckling takes place in the top chords. Effective length for each buckling bar is obtained by experimentation and comparison has been done with simulated results. For the calculation of effective length using simulated results, the distance between the points of contra-flexure has been used. This study provides an insight into the significant variations in the buckling behaviour of the frame members with the change in the buckling modes and with the change in the size of the members connected with the buckling member.