Shear behaviour of thin-walled composite cold-formed steel/PE-ECC beams
Ahmed M. Sheta,Xing Ma,Yan Zhuge,Mohamed A. ElGawady,Julie E. Mills,El-Sayed Abd-Elaal
Abstract
The novel composite cold-formed steel (CFS)/engineered cementitious composites (ECC) beams have been recently presented. The new composite section exhibited superior structural performance as a flexural member, benefiting from the lightweight thin-walled CFS sections with improved buckling and torsional properties due to the restraints provided by thinlayered ECC. This paper investigated the shear performance of the new composite CFS/ECC section. Twenty-eight simply supported beams, with a shear span-to-depth ratio of 1.0, were assembled back-to-back and tested under a 3-point loading scheme. Bare CFS, composite CFS/ECC utilising ECC with Polyethylene fibres (PE-ECC), composite CFS/MOR, and CFS/HSC utilising high-strength mortar (MOR) and high-strength concrete (HSC) as replacements for PE-ECC were compared. Different failure modes were observed in tests: shear buckling modes in bare CFS sections, contact shear buckling modes in composite CFS/MOR and CFS/HSC sections, and shear yielding or block shear rupture in composite CFS/ECC sections. As a result, composite CFS/ECC sections showed up to 96.0% improvement in shear capacities over bare CFS, 28.0% improvement over composite CFS/MOR and 13.0% over composite CFS/HSC sections, although MOR and HSC were with higher compressive strength than PE-ECC. Finally, shear strength prediction formulae are proposed for the new composite sections after considering the contributions from the CFS and ECC components.
Ahmed M. Sheta 1)UniSA STEM, University of South Australia, Adelaide, Australia 2) Structural Engineering Department, Mansoura University, Mansoura, Egypt
Xing Ma — UniSA STEM, University of South Australia, Adelaide, Australia
Yan Zhuge — UniSA STEM, University of South Australia, Adelaide, Australia
Mohamed A. ElGawady — Department of Civil, Architectural & Environmental Engineering Missouri University of Science and Technology, MO, USA
Julie E. Mills — UniSA STEM, University of South Australia, Adelaide, Australia
El-Sayed Abd-Elaal — 1)UniSA STEM, University of South Australia, Adelaide, Australia 2)Structural Engineering Department, Mansoura University, Mansoura, Egypt
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