GFRP COMPOSITES: A MATERIAL TO STRENGTHEN REINFORCED CONCRETE BEAMS WITH WEB OPENINGS FOR SHEAR
European Journal of Materials Science and Engineering, Volume 9, Issue 2, 2024
PDF Full Article, DOI: 10.36868/ejmse.2024.09.02.077, pp. 77-92
Online First, Accepted date: March 06, 2024, Publication date: June 20, 2024
Abrham GEBRE1,*, Seare TEKIE1, Yisihak GEBRE1
1 School of Civil and Environmental Engineering, Addis Ababa Institute of Technology,
Addis Ababa University, Addis Ababa, Ethiopia
* Corresponding author: abrham.gebre@aait.edu.et
Abstract
Buildings that require mechanical and electrical services must have utility pipes and ducts. The services include air conditioning, power supply, telephone lines, network cables, sewerage lines, water supply and etc. A reinforced concrete (RC) deep beam with web openings experiences excessive cracking and deflection, as well as a decrease in beam stiffness. Enlargement of these openings near supports would reduce beams’ capacity for shear. Hence, analysis and design of such beams require careful consideration, particularly with regard to their performance. In addition, design compliance to relevant codes and standards, and selection of suitable material properties and construction techniques are needed. When such an enlargement is unavoidable, strengthening of beam for shear and flexure is necessary. In this study, the use of GFRP (Glass-Fiber Reinforced Polymer) composites for strengthening of RC beams with openings is experimentally investigated. As compared to the control beam, test results showed that using GFRP was found to be effective in increasing the shear strength of beams with openings by 40% to 60%. Test results of beams with web openings exhibited higher shear strength than the predicted values whereas for strengthened beams with GFRP, code predictions are found conservative.
Keywords: Deep beams; RC; strengthening; GFRP; web openings
References:
[1] ACI 318-02: American Concrete Institute Committee, Building Code Requirements for Structural Concrete, Reported by ACI Committee 318, 2002.
[2] EN1992-1-1, Design of Concrete Structures, The European Standard, 2002.
[3] Somes, N.F. and Corley, W.G., Circular Openings in Webs of Continuous Beams, Special Publication, 42, 1974, pp. 359-398.
[4] Mansur, M.A., Effect of Openings on the Behavior and Strength of R/C Beams in Shear, Cement and Concrete Composites, 20(6), 1998, pp. 477-486. doi.org/10.1016/S0958-9465(98)00030-4
[5] A23.3-04: Canadian Standards Association, Design of concrete structures, CAS International, 2014.
[6] Krainskyi, P., Blikharskyy, Y., Khmil, R. and Blikharskyy, Z., Experimental Study of the Strengthening Effect of Reinforced Concrete Columns Jacketed Under Service Load Level, Matec Web of Conferences, 183, 2018. doi.org/10.1051/matecconf/201818302008
[7] Dash, N., Strengthening of Reinforced Concrete Beams using Glass Fiber Reinforced Polymer Composites, (Master Thesis), National Institute of Technology, Rourkela, India, 2009.
[8] Islam, M.R., Mansur, M.A. and Maalej, M., Shear Strengthening of RC Deep Beams using Externally Bonded FRP Systems, Cement and Concrete Composites, 27(3), 2005, pp. 413-420. doi:10.1016/j.cemconcomp.2004.04.002
[9] Nie X.F., Zhang S.S., Chen G.M., and Yu T., Strengthening of RC Beams with Rectangular Web Openings using Externally Bonded FRP: Numerical Simulation, Composite Structures, 248, 2020. https://doi.org/10.1016/j.compstruct.2020.112552.
[10] AbdulSahib W.S., Hamood M.J., and Majeed A.M., Shear Strengthening of Composite Concrete Steel Plate Girders with Web Openings Using Steel Strips, IOP Conf Ser: Mater Sci Eng., 2020. https://doi.org/10.1088/1757-899X/737/1/012028.
[11] El-Taly B., Hamdy M., Kandil K., and Bashandy A., Structural Behavior of Strengthened Concrete-Encased Steel Beams with Web Openings, Int J Civ Eng. 19, 2021, pp. 245–63.
[12] Ezzat, M.F., Elsabaawy, M., and Eltaly, B., Structural Performance of Strengthened Steel Girders with Web Openings under Shear Forces, ERJ. Engineering Research Journal, 44(2), 2021. , pp.175-188.
[13] Allawi A. A., Oukaili N. K., Jasim W. A., Strength Compensation of Deep Beams with Large Web Openings using Carbon Fiber–Reinforced Polymer Sheets, Advances in Structural Engineering, 24, 2021, pp. 165–82. https://doi.org/10.1177/1369433220947195.
[14] El Ame F., Mwero J. N., and Kabubo C., Openings Effect on the Performance of Reinforced Concrete Beams Loaded in Bending and Shear, Eng Technol Appl Sci Res, 10, 2020, pp. 5352–60. https://doi.org/10.48084/etasr.3317.
[15] Lu W.Y., Lin G. Z., Tseng C.C., and Lin S.J., Shear Strength of Reinforced Concrete Deep Beams with Web Openings, Journal of the Chinese Institute of Engineers, 43, 2020, pp. 694–705. https://doi.org/10.1080/02533839.2020.1796816.
[16] Arabzadeh, A., Aghayari, R. and Rahai, A.R., Investigation of Experimental and Analytical Shear Strength of Reinforced Concrete Deep Beams, International Journal of Civil Engineering, 9 (3), 2011, pp. 207-214.
[17] Al-Sheikh, S.A., Flexural Behavior of RC Beams with Opening, Concrete Research Letters, 5(2), 2014, pp. 812-824.
[18] Chin, S.C. and Doh, S.I., Behavior of Reinforced Concrete Deep Beams with Openings in the Shear Zones, Journal of Engineering and Technology (JET), 6(1), 2015, pp. 60-71.
[19] Rahim, N.I., Mohammed, B.S., Al-Fakih, A., Wahab, M.M.A., Liew, M.S., Anwar, A. and Amran, Y.M., Strengthening the Structural Behavior of Web Openings in RC Deep Beam using CFRP, Materials, 13(12), 2020, p.2804.
[20] Pimanmas, A., Strengthening R/C Beams with Opening by Externally Installed FRP Rods: Behavior and Analysis, Composite Structures, 92(8), 2010, pp.1957-1976. doi:10.1016/j.compstruct.2009.11.031
[21] Salih R., Zhou F., Abbas N., and Khan A., Experimental Investigation of Reinforced Concrete Beam with Openings Strengthened Using FRP Sheets under Cyclic Load, Materials, 13, 2020. https://doi.org/10.3390/ma13143127.
[22] Abbas O.H., Numan H.A., A State-of-the Art Review on Transverse Web Opening for Reinforced Concrete Beams with and without Strengthening Method, J Phys: Conf Ser, 2021. https://doi.org/10.1088/1742-6596/1895/1/012059.
[23] Elkafrawy, M., Elsayed, A.N., and Meleka, N.N., A State-of-the-Art-Review on Reinforced Concrete Beams with Web Openings, ERJ, 46(1), 2023, pp.119-132.
[24] Shaaban I.G., Zaher A.H., Said M., Montaser W., Ramadan M., and Abd Elhameed G.N., Effect of Partial Replacement of Coarse Aggregate by Polystyrene Balls on the Shear Behaviour of Deep Beams with Web Openings, Case Studies in Construction Materials, 12, 2020. https://doi.org/10.1016/j.cscm.2019.e00328.
[25] Kachouh N., El-Maaddawy T., El-Hassan H., and El-Ariss B., Shear Response of Recycled Aggregates Concrete Deep Beams Containing Steel Fibers and Web Openings, Sustainability, 14, 2022. https://doi.org/10.3390/su14020945.
[26] Kim H.G., Lee J.Y., and Kim K.H., Shear Performance of Reinforced Concrete Beams with Small Circular Openings Strengthened Using Rectangular and Octagonal-Shaped Reinforcement, Materials, 13, 2020. https://doi.org/10.3390/ma13245804.
[27] Ahmad B., Yousaf M., Irfan-ul-Hassan M., Sharif M.B., Siddiqi Z.A., and Ansari A.H., Effects of Web Openings on Shear Behaviour of Normal and Internally Strengthened Concrete Beams, NEDJR, XIX, 2022, pp. 19–35.
[28] Elkafrawy M., Khalil A., AlHamaydeh M., Hawileh R., and Abuzaid W., Enhancing the Shear Capacity of RC Beams with Web Openings in Shear Zones Using Pre-Stressed Fe-SMA Bars: Numerical Study, Buildings, 13, 2023.
[29] Khalaf M.R., Al-Ahmed A., Shear Strength of Reinforced Concrete Deep Beams with Large Openings Strengthened by External Prestressed Strands, Structures, 28, 2020, pp.1060–76.
[30] Jasim W.A., Tahnat Y.A., and Halahla A.M., Behavior of Reinforced Concrete Deep Beam with Web Openings Strengthened with (CFRP) Sheet, Structures, 26, 2020. pp.785–800.
[31] Kedge, S.A., Momin, U.H. and Nagendra, M.V., A Review on Experimental Analysis of Deep Beam Strengthened by Glass Fiber Reinforced Polymer Plate, International Research Journal of Engineering and Technology (IRJET), 5 (6), 2018, pp. 1150-1153.
[32] Abdel-Kareem, A.H., Shear Strengthening of Reinforced Concrete Beams with Rectangular Web Openings by FRP Composites, Advances in Concrete Construction, 2(4), 2014, pp. 281. doi: http://dx.doi.org/10.12989/acc.2014.2.4.281
[33] Khalifa, A., Gold, W.J., Nanni, A. and MI, A.A., Contribution of Externally Bonded FRP to Shear Capacity of RC Flexural Members, ASCE-Journal of Composites for Construction, 2(4), 1998, pp. 195-203.
[34] Almusallam, T.H. and Al-Salloum, Y.A., Use of Glass FRP Sheets as External Flexure Reinforcement in RC Beams, Department of Civil Engineering, King Saud University, 2005, pp. 1-15.
[35] Agag F., Ahmad S., Sallam H., Experimental Assessment of Different Strengthening Techniques for Opening in Reinforced Concrete Beams, Frattura Ed Integrità Strutturale, 16, 2021, pp.549–65. https://doi.org/10.3221/IGF-ESIS.59.36.
[36] Elansary A., Abdel A., Abdalla H.A., and Zawam M., Shear Behavior of Reinforced Concrete Beams with Web Opening Near Supports, Structures, 37, 2022, pp.1033–41.
[37] Mansur, M.A. and Tan, K.H., Concrete Beams with Openings: Analysis and Design, Vol. 20, CRC Press, 1999.
[38] ACI-ASCE Committee 426, The Shear Strength of RC Members (ACI 426R-74), Journal of the Structural Division, 1973.
[39] Megalooikonomou, K.G., Modelling of FRP-Confinement of Rectangular RC Sections, (MSc Thesis), European School for Advanced Studies in Reduction of Seismic Risk (ROSE School), University of Pavia, Pavia, Italy), 2007.
[40] Rashwan, M.M., Elsayed, A.A.Z., Abdallah, A.M. and Hassanean, M.A.M., Behavior of High-Performance Continuous RC Deep Beams with Openings and its Strengthening, Journal of Engineering Sciences, 42(5), 2014, pp. 1138-1160.
[41] Nishitha, N. and Kavitha, P., Effect of Openings in Deep Beams with Varying Span to Depth Ratios Using Strut and Tie Model Method, IOSR Journal of Mechanical and Civil Engineering (IOSR-JMCE), 20(201), 2016, pp. 78-81.
[42] Siow, S.Y., Effect of Opening with Various Size and Location on RC Deep Beam, (Doctoral Dissertation, UMP). Faculty of Civil Engineering and Earth Resources, University Malaysia Pahang, 2015.
[43] Alsaeq, H.M., Effects of Opening Shape and Location on The Structural Strength of RC Deep Beams with Openings, International Journal of Civil and Environmental Engineering, 7(6), 2013, pp. 494-499. doi.org/10.5281/zenodo.1329204
[44] ACI 440 2R-08: American Concrete Institute, Guide for the Design and Construction of Externally Bonded FRP Systems for Strengthening Concrete Structures, ACI Committee 440, 2008.
[45] CSA S6-06: Canadian Standards Association, Canadian Highway Bridge Design, CAS International: Toronto, Canada, 2006.
[46] ACI Education Bulletin. E1-07, Aggregates for Concrete: Materials for Concrete Construction, Developed by ACI Committee E-701, 2007.
[47] Tekie, S., Shear Strengthening of Reinforced Concrete Deep Beams with Openings using Glass Fiber Reinforced Polymer (GFRP) Composites, (MSc Thesis), School of Civil and Environmental Engineering, Addis Ababa Institute of Technology, Addis Ababa, Ethiopia, 2020.
[48] Retrieved from https://www.vitrulan.com/en/company.
[49] ACI Standard 211, Standard Practice for Selecting Proportions for Normal, Heavyweight, and Mass Concrete, ACI 211.1-91, 1991 (Reapproved 2002).
[50] Sikafloor®-161, Product Data Sheet, 2019.
[51] Kumalr, M., Mangalagi, S. and Harsoor, R., Behavior of RCC Beam with Circular Opening Strengthened by CFRP And GFRP Sheets, International Journal of Research in Engineering and Technology, 2013, pp. 92-96.
[52] Safan, M., Sakr, M., Strengthening RC Beams with Web Openings using GFRP Composites as External Reinforcement, Al-Azhar University Engineering Journal, AUEJ, 8(1), 2005, pp.706-719.
