22–24 Mar 2021
University of Zagreb Faculty of Civil Engineering, Zagreb, Croatia
Europe/Zagreb timezone

CYCLIC AND MONOTONIC MOMENT-ROTATION BEHAVIOUR OF CFS WEB-CONNECTED BEAM-TO-COLUMN JOINTS

Not scheduled
20m
VP (University of Zagreb Faculty of Civil Engineering, Zagreb, Croatia)

VP

University of Zagreb Faculty of Civil Engineering, Zagreb, Croatia

Kačićeva 26 10 000 Zagreb
Extended abstract Seismic Performance of Structures

Speaker

Mr Ioannis Papargyriou (PhD student, Department of Civil and Structural Engineering, The University of Sheffield)

Description

Over the past decade, the market for cold-formed steel (CFS) systems has significantly expanded, especially for the construction of low to mid-rise buildings. CFS moment-resisting frame systems have become popular even in seismic-prone regions, mainly for single-storey portal-framed buildings of industrial use. However, their application in multi-storey structures is still limited by the behaviour of the beam-to-column joints, which are prone to premature local buckling failure of the connected elements. This study aimed to develop a more practical type of moment-resisting CFS joint, which is fast and easy to assemble, while providing satisfactory seismic performance. In the proposed connection system, the beam and column elements are built-up from CFS channels and their webs are bolted to a web through-plate. In a first step, the seismic moment-rotation behaviour of CFS beam-column joints with various configurations was investigated. Detailed FE models were developed in ABAQUS, taking into account material nonlinearity and geometric imperfections, which were validated against available experimental data. The validated FE models were subsequently used to perform monotonic and cyclic analyses of CFS bolted joints with different beam slenderness values, and various web through-plate shapes and slenderness values. The moment-rotation behaviour of the studied joints was then evaluated in terms of its seismic characteristics, including bending moment capacity, rotational stiffness, ductility, energy dissipation capacity and damping coefficient. Finally, following comparison of the results, more structurally efficient CFS bolted joints suitable for multi-storey moment-resisting frame systems in earthquake regions were proposed.

DOI https://doi.org/10.5592/CO/1CroCEE.2021.122
Keywords Cold-formed steel (CFS), Bolted moment-resisting connections, FE analysis, Stiffness, Ductility

Primary authors

Mr Ioannis Papargyriou (PhD student, Department of Civil and Structural Engineering, The University of Sheffield) Dr Seyed Mohammad Mojtabaei (Department of Civil and Structural Engineering, The University of Sheffield) Dr Iman Hajirasouliha (Department of Civil and Structural Engineering, The University of Sheffield) Dr Jurgen Becque (Department of Engineering, University of Cambridge)

Presentation materials