International Journal of Engineering Technology and Scientific Innovation
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Title:
ASSESSMENT OF DESIGN GUIDELINES TO EVALUATE THE FRP SHEAR CONTRIBUTION OF STRENGTHENED PRESTRESSED CONCRETE BEAMS

Authors:
Dien Ngoc Vo-Le, Long Nguyen-Minh

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Dien Ngoc Vo-Le: Faculty of Engineering Technology, Tien Giang University, 119 Ap Bac, My Tho city, Tien Giang Province, 860000, Vietnam.
Long Nguyen-Minh: Faculty of Civil Engineering, Ho Chi Minh City University of Technology, 268 Ly Thuong Kiet Street, District 10, Ho Chi Minh City, 700000, Vietnam.

References
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[2] Ary M. I. and Kang T. H. K. Shear-strengthening of reinforced & prestressed concrete beams using FRP: Part II — Experimental investigation. International Journal of Concrete Structures and Materials, Vol 6(1), P49-57, DOI: https://doi.org/10.1007/s40069-012-0005-0.
[3] Kim, Y., Quinn K., Satrom N., Garcia J., Sun W., Ghannoum W.M. Shear strengthening of reinforced and prestressed concrete beams using carbon fiber reinforced polymer (CFRP) sheets and anchors. Center for Transportation Research at The University of Texas at Austi: Austin, TX, 2012.
[4] Murphy M., Belarbi A., and Bae S.-W. Behavior of prestressed concrete I-girders strengthened in shear with externally bonded fiber-reinforced-polymer sheets. PCI Journal, Vol 57(3), P63-82, 2012. DOI: https://doi.org/10.15554/pcij.06012012.63.82.
[5] Nguyen, T.T.D., Matsumoto K., Sato Y., Yamada M., and Niwa J. Shear-resisting mechanisms of pre-tensioned PC beams without shear reinforcement strengthened by CFRP sheets. Journal of JSCE, Vol 4(1), P59-71, 2016 DOI: https://doi.org/10.2208/journalofjsce.4.1_59.
[6] Nguyen-Minh L., Vo-Le D., Tran-Thanh D., Pham T.M., Ho-Huu C., and Rov?ák M. Shear capacity of unbonded post-tensioned concrete T-beams strengthened with CFRP and GFRP U-wraps. Composite Structures,Vol 184, P1011-1029, 2018. DOI: https://doi.org/10.1016/j.compstruct.2017.10.072.
[7] Vo-Le D., Tran D. T., Pham T. M., Ho-Huu C., Nguyen-Minh L. Re-evaluation of shear contribution of CFRP and GFRP sheets in concrete beams post-tensioned with unbonded Tendons. Engineering Structures, 2021 (reviewed).
[8] ACI (American Concrete Institute). Guide for the Design and Construction of Externally Bonded FRP Systems for Strengthening Concrete Structures, in ACI 440.2R-17, Farmington Hills, Michigan, 2017.
[9] CNR (National Research Council). Guide for the Design and Construction of Externally Bonded FRP Systems for Strengthening Existing Structures - Materials, RC and PC structures, masonry structures, in CNR-DT 200 R1/2013, Rome, 2013.
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[12] HB 305. Design handbook for RC structures retrofitted with FRP and metal plates: beams and slabs. Standards Autralia, 2008.
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[15] TR55. Design Guidance for Strengthening Concrete Structures using Fibre Composite Materials. Second Edition. Report of a Concrete Society Committee, London, Great Britain, 2012.

Abstract:
This paper is mainly presented on statistical assessment and analysis of the accuracy of the current design guidelines to evaluate the shear resistance of the fiber-reinforced polymer (FRP) sheets for prestressed concrete (PC) beams strengthened by externally bonded FRP sheets. The evaluation of the current prediction models is based on a database of experimental results from the previous and current author's research. The specifications of the beams are diverse and wide enough such as beam types (prestressed concrete beams using bonded tendons - BPC beams and unbonded tendons - UPC beams), cross-section shape, concrete strength, the effective prestress in strands, tendon profile, and shear span to depth ratio - a/d and so on. This study proved the inaccuracy of the formulas in recent design guidelines to evaluate the shear contribution of FRP sheets for prestressed concrete beams.

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