Pullout Tests on Near-Surface-Mounted CFRP Rods with and Without Lateral Grooves
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2018-11-28 https://doi.org/10.14419/ijet.v7i4.20.25855 -
Bond, concrete, NSM-CFRP, pullout, strengthening -
Abstract
An assortment of retrofitting strategies are utilized to redesign existing structures. Fiber Fortified Polymer (FRP) materials have been utilized to reinforce numerous basic segments. One of the promising strategies for reinforcing solid individuals in flexure is the close surface-mounted (NSM) FRP strategy. The greater part of the occasions, holding is the basic factor that controls the structure of this method. In this examination, pullout tests were performed to explore the holding conduct of NSM-CFRP poles. The parameters were the span of the CFRP bars and the notch geometry. The goal of this investigation was to acquire a pullout limit that is in any event half of the CFRP rigidity. Three diverse pole sizes were utilized, and an aggregate of six pullout examples were tried. The outcomes demonstrated that utilizing parallel scores essentially expanded the pullout quality. Without horizontal depressions, the most extreme pullout quality for the littlest bar estimate was under half of the CFRP rigidity. The outcomes additionally demonstrated that the security quality is exceedingly influenced by the distance across of the CFRP bars.
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References
[1] Wahab N, Topper T, Soudki KA (2015), Modelling experimental bond fatigue failures of concrete beams strengthened with NSM CFRP rods. Composites Part B: Engineering, 70, 113–21, doi:10.1016/J.COMPOSITESB.2014.10.040.
[2] Capozucca R, Blasi MG, Corina V (2015), NSM technique: Bond of CFRP rods and static/dynamic response of strengthened RC beams, Composite Structures, 127, 466–79. doi:10.1016/j.compstruct.2015.03.013.
[3] Lee H, Jung W, Chung W (2017), Bond behavior of near surface mounted CFRP rods under temperature cycling. Engineering Structures, 137, 67–75. doi:10.1016/J.ENGSTRUCT.2017.01.057.
[4] Torres L, Sharaky IA, Barris C, Baena M (2016), Experimental study of the influence of adhesive properties and bond length on the bond behaviour of NSM FRP bars in concrete, Journal of Civil Engineering and Management, 22, 808–17. doi:10.3846/13923730.2014.914097.
[5] De Lorenzis L, Modena C, Nanni A (2002), Bond between near-surface mounted fiber-reinforced polymer rods and concrete in structural strengthening, ACI Structural Journal, 99, 123–32.
[6] De Lorenzis L, Rizzo A, La Tegola A (2002), A modified pull-out test for bond of near-surface mounted FRP rods in concrete, Composites Part B: Engineering, 33, 589–603. doi:10.1016/S1359-8368(02)00052-5.
[7] Novidis DG, Pantazopoulou SJ (2008), Bond tests of short NSM-FRP and steel bar anchorages, Journal of Composites for Construction, 12, 323–33. doi:10.1061/ASCE1090-0268200812:3323.
[8] Bilotta A, Ceroni ; F, Ludovico ; M Di, Nigro ; E, Pecce ; M, Manfredi G (2011), Bond efficiency of EBR and NSM FRP systems for strengthening concrete members, Journal of Composites for Construction, 15, 757–72. doi:10.1061/(ASCE)CC.1943-5614.0000204.
[9] Soliman SM, El-Salakawy E, Benmokrane B (2011), Bond performance of near-surface-mounted FRP bars, Journal of Composites for Construction, 15, 103–11. doi:10.1061/ASCECC.1943-5614.0000150.
[10] Sharaky IA, Torres L, Baena M, Vilanova I (2013), Effect of different material and construction details on the bond behaviour of NSM FRP bars in concrete, Construction and Building Materials, 38, 890–902. doi:10.1016/J.CONBUILDMAT.2012.09.015.
[11] Jawdhari A, Harik I (2018), Finite element analysis of RC beams strengthened in flexure with CFRP rod panels, Construction and Building Materials, 163, 751–66. doi:10.1016/j.conbuildmat.2017.12.139.
[12] ACI Committee 440 (2017), Guide for the Design and Construction of Externally Bonded FRP Systems for Strengthening Concrete Structures, American Concrete Institute, Farmington Hills, MI.
[13] ASTM D7205 / D7205M – 06 (2016), Standard Test Method for Tensile Properties of Fiber Reinforced Polymer Matrix Composite Bars, West Conshohocken, PA.
[14] ASTM C39 / C39M – 18 (2018), Standard Test Method for Compressive Strength of Cylindrical Concrete Specimens, West Conshohocken, PA.
[15] ASTM C496 / C496M – 17 (2017), Standard Test Method for Splitting Tensile Strength of Cylindrical Concrete Specimens, West Conshohocken, PA.
[16] ASTM C78 / C78M – 18 (2018), Standard Test Method for Flexural Strength of Concrete (Using Simple Beam with Third-Point Loading), West Conshohocken, PA.
[17] Al-Obaidi S (2015), Behavior of reinforced concrete beams retrofitted in flexure using CFRP-NSM technique, MS Thesis, Portland State University.
[18] Saeed Y, Rad F (in-press), Experimental investigation of CFRP prestressed concrete beams, ACI Special Publications.
[19] Hassan T, Rizkalla S (2003), Investigation of bond in concrete structures strengthened with near surface mounted carbon fiber reinforced polymer strips, Journal of Composites for Construction, 7, 248–57. doi:10.1061/(ASCE)1090-0268(2003)7:3(248).
[20] De Lorenzis L, Lundgren K, Rizzo A (2004), Anchorage length of near-surface mounted fiber-reinforced polymer bars for concrete strengthening—experimental investigation and numerical modelling, ACI Structural Journal, 101, 269–78. doi:10.14359/13025.
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How to Cite
M. Al-Obaidi, S., M. Saeed, Y., & N. Rad, F. (2018). Pullout Tests on Near-Surface-Mounted CFRP Rods with and Without Lateral Grooves. International Journal of Engineering & Technology, 7(4.20), 72-78. https://doi.org/10.14419/ijet.v7i4.20.25855Received date: 2019-01-13
Accepted date: 2019-01-13
Published date: 2018-11-28