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Behavior of one-way RC slabs flexurally strengthened with prestressed NSM CFRP laminates: assessment of influencing parameters
The efficacy of the NSM technique using prestressed CFRP laminates for the flexural strengthening of RC slabs was assessed experimentally. The results obtained indicated that the application of NSM CFRP laminates with a certain level of prestress is a suitable strategy to increase the load-carrying capacity of slabs in terms of service limit state (SLS) conditions. The higher is the CFRP prestressed level the larger is the performance of the NSM technique in the improvement of the behavior of the slabs at SLS conditions, but the deflection at the maximum load of the slabs decreased with the increase of the prestress level. The prestressed NSM CFRP laminates were more effective in the slabs with the lower concrete strength class, mainly at SLS conditions. The increase of the percentage of the flexural reinforcement had a detrimental effect on the performance of prestressed NSM CFRP laminates. An analytical formulation was developed for predicting the cracking, yielding and maximum loads of RC slabs flexurally strengthened with prestressed NSM CFRP laminates and a very good predictive performance was obtained. An upper limit is proposed for the prestress level for ensuring a compromise of ductility and strengthening effectiveness of this type of structural elements. ; The authors wish to acknowledge the support provided by the “Empreiteiros Casais” and S&P. This work was 6 supported by FEDER funds through the Operational Competitiveness and Internationalization Programme (POCI)7 and National Funds through FCT - Portuguese Foundation for Science and Technology under the project POCI-01-8 0145-FEDER-030956.
Behavior of one-way RC slabs flexurally strengthened with prestressed NSM CFRP laminates: assessment of influencing parameters
The efficacy of the NSM technique using prestressed CFRP laminates for the flexural strengthening of RC slabs was assessed experimentally. The results obtained indicated that the application of NSM CFRP laminates with a certain level of prestress is a suitable strategy to increase the load-carrying capacity of slabs in terms of service limit state (SLS) conditions. The higher is the CFRP prestressed level the larger is the performance of the NSM technique in the improvement of the behavior of the slabs at SLS conditions, but the deflection at the maximum load of the slabs decreased with the increase of the prestress level. The prestressed NSM CFRP laminates were more effective in the slabs with the lower concrete strength class, mainly at SLS conditions. The increase of the percentage of the flexural reinforcement had a detrimental effect on the performance of prestressed NSM CFRP laminates. An analytical formulation was developed for predicting the cracking, yielding and maximum loads of RC slabs flexurally strengthened with prestressed NSM CFRP laminates and a very good predictive performance was obtained. An upper limit is proposed for the prestress level for ensuring a compromise of ductility and strengthening effectiveness of this type of structural elements. ; The authors wish to acknowledge the support provided by the “Empreiteiros Casais” and S&P. This work was 6 supported by FEDER funds through the Operational Competitiveness and Internationalization Programme (POCI)7 and National Funds through FCT - Portuguese Foundation for Science and Technology under the project POCI-01-8 0145-FEDER-030956.
Behavior of one-way RC slabs flexurally strengthened with prestressed NSM CFRP laminates: assessment of influencing parameters
Hosseini, Mhoammadreza Mostakhdemin (author) / Dias, Salvador J. E. (author) / Barros, Joaquim A. O. (author)
2020-08-01
doi:10.1016/j.compstruct.2020.112259
Article (Journal)
Electronic Resource
English
DDC:
690
Behavior of RC beams flexurally strengthened with NSM CFRP laminates
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Flexural Behavior of Preloaded RC Slabs Strengthened with Prestressed CFRP Laminates
| British Library Online Contents | 2014