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RISS 인기검색어
- 검색키워드
- 저자 : Mohamed A. ElGawady (검색결과 2 건)
- 무료
- 기관 내 무료
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Seismic In-plane Performance of Retrofitted Masonry Walls
S. H. Farooq,A. ElGawady Mohamed,M. Ilyas 대한토목학회 2014 KSCE Journal of Civil Engineering Vol.18 No.1
Retrofitting of masonry to improve its seismic performance is the focus of research community all around the globe. In the present work, a new masonry retrofitting technique using externally anchored steel strips mesh is presented. An extensive experimental programme was carried out to study the effects of proposed technique on masonry lateral strength, ductility, energy dissipation,response and damping factor under lateral cyclic loading. A total of twenty tests were carried out; 1) twelve were lateral cyclic tests,2) four monotonic lateral tests and 3) four pure compression tests. The test results were analysed in five separate groups and this paper presents the analysis of group 3, which deals with the effect of steel retrofitting of un-reinforced masonry wall panels on its seismic performance. Six single leaf panels with aspect ratio of 0.67 were constructed using same type of material and workmanship. It was observed that amount of steel reinforcement and meshing pattern of steel strips had significant effect on seismic performance and failure modes. The simplicity, cost effectiveness and efficacy of this proposed technique could help the local designers and engineers to enhance seismic performance of existing masonry structures.
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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 국제구조공학회 2023 Steel and Composite Structures, An International J Vol.46 No.1
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.
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