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Flexural strengthening of RC continuous beams with FRP reinforcements according to the NSM and EB techniques : experimental, analytical and numerical (FE) study

Abstract : This thesis is composed of four parts. Each part contains several research items according to the structural topic planned to be studied. Although the logical sequence was preserved in the thesis, each part was structured to discuss and address a specific flexural issue regarding strengthening reinforced concrete (RC) beams with fiber-reinforced polymers (FRPs). In general, the thesis experimentally, analytically, and numerically studies the possibility of using near surface mounted (NSM) and externally bonded (EB) techniques for strengthening and repairing continuous two-span beams. In summary, the experimental scheme of this thesis comprised 21 beams: six beams were simply supported with a 3-m length each, and 15 beams were continuous over two spans with a 6-m total beam length and 2.85-m span length each. The analytical analysis and design approaches as well as the finite element (FE) numerical models were developed or/and utilized in some parts according to their importance and necessity.- The first part studies the possibility of strengthening RC beams on their side surfaces instead of their soffits. Therefore, the side near surface mounted (SNSM or side-NSM) technique was proposed and investigated on six simply supported beams: one control beam and five others initially strengthened with 2∅6 carbon-FRP (CFRP) bars.-The second part presents an experimental and analytical study regarding the assessment of using the NSM technique for flexural strengthening of continuous RC beams. The experimental program of this part consists of six full-scale two-span beams: one control beam and five others strengthened with FRP bars in both hogging and sagging regions.-The third part presents a comparison between the NSM and side-NSM techniques for strengthening continuous two-span RC beams with CFRP rods. The study comprises two main sections: an experimental section and a FE section.-The fourth part presents an experimental study that was primarily conducted to fill in the gaps in the literature regarding strengthening continuous RC beams with EB-CFRP. Generally, this part consists of three main sections. In the first section, seven large-scale two-span beams are statically investigated: one control beam (from part two) and six beams initially strengthened in terms of bending with CFRP sheets or plates. The second section evaluates the effectiveness of the current design codes in determining the flexural strength of continuous beams strengthened externally with CFRP sheets or plates. Finally, the third section assesses and compares the efficiencies of the EB and NSM techniques.
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Submitted on : Wednesday, November 10, 2021 - 8:45:17 AM
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  • HAL Id : tel-03423289, version 1


Mohammad Abdallah. Flexural strengthening of RC continuous beams with FRP reinforcements according to the NSM and EB techniques : experimental, analytical and numerical (FE) study. Engineering Sciences [physics]. Université de Lorraine, 2021. English. ⟨NNT : 2021LORR0156⟩. ⟨tel-03423289⟩



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