Neutral axis depth and moment redistribution in FRP and steel reinforced concrete continuous beams |
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| Affiliation: | 1. CEMUC, Department of Civil Engineering, University of Coimbra, Coimbra 3030-788, Portugal;2. Department of Civil Engineering, University of Coimbra, Coimbra 3030-788, Portugal;1. Department of Frontier Materials Chemistry, Graduate School of Science and Technology, Hirosaki University, Hirosaki 036-8561, Japan;2. Unimatec Co., Ltd., Kitaibaraki-shi, Ibaraki 319-1593, Japan;1. Mechanical Design and Production Dept., Faculty of Engineering, Zagazig University, Egypt;2. Centre of Nanotechnology, Zagazig University, Egypt;3. Mechanical and Mechatronics Engineering Dept., Faculty of Engineering, Waterloo University, Canada;4. Systems Design Engineering Dept., Faculty of Engineering, Waterloo University, Canada;1. Centre for Infrastructure Engineering and Safety, School of Civil and Environmental Engineering, The University of New South Wales, Australia;2. School Civil and Environmental Engineering, The University of New South Wales, Australia;1. Centre for Infrastructure Engineering and Safety, School of Civil and Environmental Engineering, The University of New South Wales, Australia;2. Head of School, Civil and Environmental Engineering, The University of New South Wales, Australia;3. Institute of Structural Engineering, Swiss Federal Institute of Technology (ETH), Switzerland;1. CEMUC, Department of Civil Engineering, University of Coimbra, Coimbra 3030-788, Portugal;2. Department of Civil Engineering, University of Coimbra, Coimbra 3030-788, Portugal |
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| Abstract: | The neutral axis depth is considered the best parameter for quantifying the moment redistribution in continuous concrete beams, as exemplified in various design codes worldwide. It is therefore important to well understand the variation of neutral axis depth against moment redistribution. This paper describes a theoretical investigation into the neutral axis depth and moment redistribution in concrete beams reinforced with fibre reinforced polymer (FRP) and steel bars. A finite element model has been developed. The model predictions are in favourable agreement with experimental results. Three types of reinforcement are considered, namely, glass fibre, carbon fibre and steel. Various levels of reinforcement ratio are used for a parametric evaluation. The results indicate that FRP reinforced concrete continuous beams exhibit significantly different response characteristics regarding the moment redistribution and variation of neutral axis depth from those of steel reinforced ones. In addition, it is found that the code recommendations are generally unsafe for calculating the permissible moment redistribution in FRP reinforced concrete beams, but the neglect of redistribution in such beams may be overconservative. |
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| Keywords: | A. Carbon fibre A. Glass fibre C. Numerical analysis |
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