NUMERICAL INVESTIGATION OF STEEL BEAMS WITH ASYMMETRIC CROSS-SECTION UNDER STATIC LOADING

Abstract

A steel beam is a structural steel product that is made to support heavy loads. Steel beams come in different sizes and types, hence their different applications in the construction of structures and buildings. The specifications of a structure determine the geometry, size and shape of beams. This research work studies on behavior and use of asymmetric steel section under lateral torsional buckling. Lateral torsional buckling is the deformation of the beam due to the applied loads away from its longitudinal axis. Further, it causes steel beams failures. Experimental results are used for validation analysis using ANSYS nonlinear finite element analysis (FEA) software and further parametric studies on the span to depth ratio, different geometry of web opening, steel grade, and different position of shifted flange is performed to investigate the behavioral response of asymmetric steel beams under static loading. FEA results showed span with depth increase and steel grade variation of asymmetric steel beams has major effect on strength of the asymmetric steel beam whereas different geometry of web opening and different configuration of shifted flange gave moderate impact on the steel strength of the beam. To be specific, increasing span to depth ratio from 3000mm to 9000mm length beam the strength increased by 56.18%. Increasing steel grade from S-275 to S-460 increases strength of steel by 31.5%. While dealing about web opening, rectangular web opening got maximum load resistance than square and circular web opening by 15.68% and 17.83% respectively. Then from different position of shifted flange, the beam got maximum strength when position of shifted flange at compression zone than position of shifted flange at tension zone by 8.42%. Increasing span with depth of asymmetric steel beams under static loading from 3000mm to 9000mm increased the Von Mises stress of the beam by 19.02%. Flexural failure or yielding of steel and local buckling is major causes for the failures of asymmetric steel beam around support and at mid span. Keywords: -