Investigations on structural performance of hybrid stainless steel I-beams based on slenderness

摘要

A numerical investigation on the flexural behaviour of Lean Duplex Stainless Steel (LDSS), Hybrid Stainless Steel (HSS) and Duplex Stainless Steel (DSS) I-beams using the commercial finite element software, ABAQUS are presented in this paper based on cross-section slenderness i.e. flange and web critical sections. 3-point bending (3PB) and 4-point bending (4PB) specimens were chosen for the current numerical investigations. Based on the study, it has been observed that for both Class 1 flange-critical and web-critical sections, LDSS I-beams has a higher R (rotation capacity) as compared to HSS and DSS I-beams. Significant increase in M-u (ultimate bending strength) can be seen in case of HSS I-beams, as compared to DSS and LDSS I-beams. In general, EN 1993-1-4 is found to be reliable and applicable for LDSS, HSS and DSS I-beams. New DSM formulation for HSS I-beams has been proposed based on the full-range modified Direct Strength Method (DSM) formulation for carbon steel.