Shear Capacity of Cold-Formed Stainless Steel Beam with Elliptical Web Openings: Numerical Analyses

Fareed, Ishqy, Wanniarachchi, Somadasa, Poologanathan, Keerthan, Gunalan, Shanmuganathan, Perampalam, Gatheeshgar and Rajanayagam, Heshachanaa (2021) Shear Capacity of Cold-Formed Stainless Steel Beam with Elliptical Web Openings: Numerical Analyses. In: Proceedings of the 10th International Conference on Structural Engineering and Construction Management 2019 (ICSECM). University of Peradeniya, Kandy, Sri Lanka, pp. 216-225. ISBN 9789555892742

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Abstract

Cold-formed stainless-steel sections are increasingly being used in the construction industry, for both architectural and structural applications. The excellent combination of mechan-ical properties and corrosion resistance makes stainless steel a very good material for structural applications. Due to the lack of design rules for stainless steel, the design rules for carbon steel have been generally adopted in the stainless-steel design. However, the prominent non-linear be-haviour of stainless steel, which is the main difference with carbon steel, makes the standards for carbon steel not always accurate in the stainless-steel design. The provision of web openings at appropriate locations in such sections is also important to avoid cutting holes at an inappropriate location during the implementation stage. The type of section and the shape of opening were primarily chosen based on the application. The scope of this study is however limited to stainless steel Lipped Channel Beams (LCB) with elliptical web openings. The provision of openings in web affects the shear behaviour and shear capacity of LCB sections, but only very limited re-searches have been conducted so far. Hence, a numerical analysis was undertaken to investigate the shear behaviour and strength of cold-formed stainless steel LCB section with elliptical web openings. Finite element models of cold-formed ferritic stainless steel LCB with centered web openings were developed under the simply supported loading condition. They were validated with currently available shear test results and a detailed parametric study was undertaken to develop an extensive shear strength database. Numerical results showed that the currently available reduc-tion factor equations of circular web opening are either conservative or unsafe to use for the non-circular openings. Hence, numerical results were then used to develop a reduction factor to the shear capacities of cold-formed stainless steel LCBs with elliptical web opening.

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