External strengthening of reinforced concrete beam with opening by bamboo fiber reinforced composites
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ORIGINAL ARTICLE
External strengthening of reinforced concrete beam with opening by bamboo fiber reinforced composites Siew Choo Chin . Kong Fah Tee Jolius Gimbun
. Foo Sheng Tong . Shu Ing Doh .
Received: 5 March 2020 / Accepted: 28 October 2020 Ó The Author(s) 2020
Abstract This paper presents the structural behaviour of reinforced concrete (RC) beams with and without openings strengthened externally with bamboo fiber reinforced composite (BFRC) plates in shear and flexure, respectively. Mechanical properties include tensile and flexural strength of epoxy, polyester and vinyl-ester based BFRC plates with 0%, 10%, 20%, 30% and 40% fiber volume fractions were evaluated. A total of fourteen beams were cast to evaluate the structural behaviour of RC beams strengthened with BFRC plates. All the beams were tested to failure under four-point bending. The results presented were in terms of load–deflection behaviour,
Electronic supplementary material The online version of this article (https://doi.org/10.1617/s11527-020-01572-y) contains supplementary material, which is available to authorised users. S. C. Chin F. S. Tong S. I. Doh Department of Civil Engineering, College of Engineering, Universiti Malaysia Pahang, Lebuhraya Tun Razak, 26300 Gambang, Kuantan, Pahang, Malaysia S. C. Chin K. F. Tee (&) Faculty of Engineering & Science, University of Greenwich, Central Avenue, Chatham Maritime ME4 4TB, Kent, UK e-mail: [email protected]
failure mode and crack pattern. A comparison was also made between the performance of epoxy, polyester and vinyl-ester based BFRC plates in shear strengthening of RC beams with openings. Results revealed that the presence of openings in the shear zone reduced the original beam capacity of the control beam to about 52–55%. Shear strengthening of RC beams with openings using epoxy based BFRC plates showed significant improvement in regaining the beam structural capacity to approximately 32–36% higher than the un-strengthened beams. Meanwhile, strengthening of RC beams in flexure with epoxy based BFRC plates managed to regain the beam original capacity up to 98% of the control beam. Bamboo fiber composite reinforced with epoxy, polyester and vinyl-ester resins of 40% fiber volume fraction managed to regain the beam original capacity up to 82%. It was found that BFRC plates could divert and mitigate the formation of cracks away from the strengthened region as well as improved the beam ductility. Keywords Bamboo fiber reinforced composite (BFRC) Beam Experimental Flexural Reinforced Strengthening Shear
1 Introduction J. Gimbun Center of Advanced Research in Fluid Flow, Universiti Malaysia Pahang, Lebuhraya Tun Razak, 26300 Gambang, Kuantan, Pahang, Malaysia
Natural fiber has advantages as a sustainable, environmentally friendly and low-cost construction
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material. In the past, most of the investigations on natural fiber composites such as kenaf [29], bamboo [18, 24, 35], jute [16], sisal Ramesh et al. [26]
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