Strengthening of cold-formed steel channels using different reinforcing options and innovative connections
Cold-formed steel (CFS) has become an essential material in modern construction due to its lightweight, cost-effectiveness, and versatility. This study primarily investigated the web crippling capacity of channels with elongated edge-stiffened web holes. Compared to traditional circular edge-stiffened web holes, these elongated holes accommodate larger electrical conduits and water supply systems. The new Direct Strength Method (DSM) was developed to accurately predict their web crippling strength. In addition, this research explored key advancements in CFS systems, including built-up box sections and trusses equipped with advanced Howick Rivet Connectors (HRCs). These high-performance connectors have demonstrated superior performance, providing greater connection strength than traditional self-drilling screws and better ductility than bolted connections. In this study, HRCs were utilized in truss systems and built-up box sections, offering critical data to support their practical application in engineering projects. Furthermore, axial tests on telescopic studs and swaged sections were conducted to address installation challenges commonly encountered in real-world scenarios. Through experimental studies, numerical simulations, and parametric analyses, this research enhances the understanding of these systems, paving the way for more reliable and efficient applications in structural engineering. The findings are synthesized to highlight their implications and provide recommendations for integrating these insights into international design standards. By bridging critical knowledge gaps, this thesis contributes to the broader adoption of advanced CFS systems in construction, fostering innovation, sustainability, and efficiency in structural design.
cold-formed steel, elongated web holes, Howick Rivet Connectors, telescopic studs, swaged sections
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