Abstract
Reinforced Concrete (RC) beam elements use bending action to resist the loads imposed on them. In critical situations, ideally, an RC beam must permit ample time to the occupants to evacuate the structure prior to collapse. Structures become weak over time, owing to environmental action, change in occupancy conditions, excessive loading, etc. An effort has been made here, for flexural strengthening of pre-designed beam element, using NSM technique by adopting three types of bars as variables, and by keeping all other parameters constant. The study includes the use of Extruded Glass Fibre Reinforced Polymer (GFRP) bars, Fe-415 bars, and Pultruded Basalt Fibre Rock Polymer (BFRP) bars for strengthening. End de-bonding was observed in all three cases. However, amongst all three, the best one was selected for end confinement using 50 mm wide CFRP wrap, using U-wrap technique in order to ascertain the performance enhancement. Here, since end confinement played its role, no de-bonding was observed. Conclusions are drawn based on observations pertaining to load, deflection, strain in steel, and compressive strain in concrete and de-bonding.
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References
Barros, J.A.O., Fortes, A.S.: Flexural strengthening of concrete beams with CFRP laminates bonded into slits. Cem. Concr. Comp. 27, 471–480 (2005)
Barros, J.A.O., Ferreira, D.R.S.M., Fortes, A.S., Dias, S.J.E.: Assessing the effectiveness of embedding CFRP laminates in the near surface for structural strengthening. Constr. Build. Mater. 20, 478–491 (2006)
Carreira, D.J., Chu, K.H.: Stress-strain relationship for reinforced concrete in tension. ACI J. 83(3), 21–28 (1986)
Chen, S., Kabeyasawa, T.: Average stress-strain relationship of steel bars embedded in concrete. In: Proceedings of 13th World Conference on Earthquake Engineering, Vancouver, B.C., Canada, Paper No. 3290 (2004)
Cruz, J.S., Barros, J.: Modeling of bond between near-surface mounted CFRP laminate strips and concrete. Comp. Struct. 82, 1513–1521 (2004)
De Lorenzis, L., Nanni, A.: Characterization of FRP Rods as near-surface mounted reinforcement. J. Compos. Constr. 114–121 (2001)
Hollaway, L.C., Teng, J.G.: Strengthening and Rehabilitation of Civil Infrastructures Using Fibre-Reinforced Polymer (FRP) Composites. Woodhead Publ, Boca Raton (2008)
Laraba, A., Merdas, A., Chikh, N.E.: Structural performance of RC beams strengthened with NSMCFRP. In: Proceeding of the World Congress on Engineering, vol. II, London, 978–988 (2014)
Lorenzis, L.D., Rizzo, A., Tegola, A.L.: A modified pull-out test for bond of near-surface mounted FRP rods in concrete. Comp.: Part B 33, 589–603 (2002)
Morsy, A.M., El-Tony, M., El-Naggar, M.: Flexural repair/strengthening of pre-damaged R.C. beams using embedded CFRP rods. Alexandria Eng. J. 54, 1175–1179 (2015)
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Patel, J.R., Patel, M.R., Tank, T.G., Vasanwala, S.A., Modhera, C.D. (2019). Flexural Strengthening of RC Beams Using NSM Technique. In: Deb, D., Balas, V., Dey, R. (eds) Innovations in Infrastructure. Advances in Intelligent Systems and Computing, vol 757. Springer, Singapore. https://doi.org/10.1007/978-981-13-1966-2_21
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DOI: https://doi.org/10.1007/978-981-13-1966-2_21
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