Abstract
This paper is concerned with the apex joint of a novel cold-formed steel (CFS) nested tapered box beam (NTBB) portal frame. The NTBB section comprises two G-sections welded together, and its novelty lies in that it can be tapered, leading to material savings. At the apex joint, the NTBB sections are connected through bolted side-plates, whose strength is the focus of this paper. A non-linear elastoplastic finite element model is described herein, and a parametric study undertaken covering 340 finite element models. A sensitivity analysis has been conducted to identify key parameters for the study. In the parametric study, the thickness, the pitch of the frame and the size of the bolted side-plate are varied. Both opening and closing moments have been considered. Using the results of the parametric study, a design recommendation is proposed for the minimum thickness of the bolted side-plates.
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