A parametric study on the effectiveness of the NSM technique for the flexural strengthening of continuous RC slabs |
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| Authors: | Matteo Breveglieri Joaquim A.O. Barros Gláucia M. Dalfré Alessandra Aprile |
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| Affiliation: | 1. Dep. of Eng., University of Ferrara, Via Saragat, 1-44121 Ferrara, Italy;2. ISISE, Dep. of Civil Eng., University of Minho, Guimarães, Portugal;1. Department of Construction Engineering, Universitat Politècnica de Catalunya, UPC, Jordi Girona 1-3, 08034 Barcelona, Spain;2. Department of Structural and Building Engineering, Concrete Structures Group, Technische Universiteit Delft, TU Delft, Stevinweg 1, 2628 CN Delft, Netherlands;1. Department of Materials Science and Engineering, Indian Institute of Technology Hyderabad, Yeddumailaram 502205, India;2. Institut für Strukturphysik, Technische Universität Dresden, 01062 Dresden, Germany;3. Laboratoire d’Etude des Microstructures et de Mécanique des Matériaux (LEM3), Université Paul-Verlaine de Metz, 57012 Metz, France;4. Institut für Angewandte Physik, Technische Universität Dresden, 01062 Dresden, Germany;1. Department of Structures for Engineering and Architecture, University of Naples Federico II, via Claudio 21, 80125 Napoli, Italy;2. Engineering Department, University of Sannio, Piazza Roma 21, 82100 Benevento, Italy;1. Department of Civil Engineering, Isfahan University of Technology (IUT), Isfahan, Iran;2. Department of Civil Engineering, Faculty of Science and Technology, Universidade NOVA de Lisboa, Caparica, Portugal;3. CERIS, Lisbon, Portugal;1. ISISE, University of Minho, Department of Civil Engineering, Guimarães, Portugal;2. INEGI, University of Porto, Faculty of Engineering, Porto, Portugal;3. CITAB, University of Trás-os-Montes and Alto Douro, Vila Real, Portugal;1. AMADE, Polytechnic School, University of Girona, Campus Montilivi s/n, 17071 Girona, Spain;2. Materials Engineering Department, Faculty of Engineering, Zagazig University, P.O. Box 44519, Zagazig, Sharkia, Egypt;3. Civil Engineering Department, Jazan University, Jazan 706, Saudi Arabia |
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| Abstract: | Recent experimental research has shown that the Near Surface Mounted (NSM) technique has significant potential for increasing the load-carrying capacity of continuous reinforced concrete (RC) slabs. This flexural strengthening technique is based on the installation of rectangular cross sectional carbon fibre reinforced polymer (CFRP) laminates into thin slits that have been opened into the top concrete cover on intermediate supports as well as into the bottom concrete cover in the tensile zones.However, there are several drawbacks to the NSM technique. The linear-elastic behaviour of the CFRP laminates, combined with the possibility of premature detachment of the concrete cover that includes these laminates, can compromise the effectiveness of the flexural strengthening, the moment redistribution and the ductility performance of this type of structure.In order to evaluate the influence of concrete strength, the strengthening configuration, the percentage of CFRP on the load-carrying capacity, the moment redistribution ability and ductility performance of this type of structure, a parametric study was carried out by executing material nonlinear analysis with an FEM-based computer program, whose predictive performance was calibrated based on the results of a previous experimental program. |
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