Experimental investigation of steel frames made of hybrid steel welded I‐sections

An experimental investigation into the structural behaviour of steel frames made up of hybrid steel welded I-section members is presented in this paper. The tested hybrid steel welded I-section profile had quenched and tempered S690 steel flanges and an S355 steel web. The experimental programme comprised four two-dimensional, single storey, single bay frames subjected to different combinations of horizontal and vertical loading, thus enabling different beam, sway as well as combined beam and sway plastic collapse mechanisms to be examined. The frames were fully laterally restrained using a bespoke lateral bracing system to ensure that no out-of-plane instability phenomena were experienced during testing. The experimental setup, loading schemes, instrumentation and key experimental results are reported. The experimental results are fundamental to developing an understanding of the behaviour of hybrid steel welded I-sections at the structural system level. Further research is underway to underpin the development of suitable design rules for steel frames made of such hybrid steel welded I-section members.