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Experimentally Comparative Study on Different Strengthening Methods of Reinforced Concrete Deep Beams

Osama Megahed El Battawy, Khaled Farouk El Kashif, Hany Ahmed Abdalla

Abstract


The aim of this study is to investigate the effect of strengthening reinforced concrete deep beams. An experimental study was done using six reinforced concrete deep beams have the same dimensions of 1150×800×150 mm, and subjected to mid-span concentrated load up to failure. Beams were different in the type, Location of strengthening and the ratio of reinforcement. Beams were divided into three groups. The first group included beams strengthened internally by single strut and either vertical or horizontal additional reinforcement. The second group included beams strengthened using double embedded strut or using CFRP as external strengthening. The third group included one beam strengthened using inclined stirrups. One of the specimens was tested without any strengthening and one specimen was strengthened by external CFRP sheets for comparison purposes the results of the experimental study shown remarkable improvement for using each type of strengthening. Results shown that using the mechanism of increasing stirrups by double rate and using single strut reinforcing is the optimum choice. This is due to the fact that this type of strengthening provides significant increase in the beam capacity in additional to the enhanced behavior of the beam. By this study comparison between each type of strengthening was done and the optimum type to be used in accordance with parameters of gained load capacity of tested deep beams.

Keywords


Strut and Tie; Inclined Stirrups; CFRP; Single Embedded Strut; Double Embedded Strut.

References


Khatab, M.A.T., A.F. Ashour, T. Sheehan, and D. Lam. “Experimental Investigation on Continuous Reinforced SCC Deep Beams and Comparisons with Code Provisions and Models.” Engineering Structures 131 (January 2017): 264–274. doi:10.1016/j.engstruct.2016.11.005.

Londhe, Poonam A., and C. M. Deshmukh. "Strengthening of Deep Beam Using FRP Wrapping: A Review." SKN International Journal of Scientific and Multidisciplinary Engineering Research (SKNIJSMER): 26, 2017.

Tetta, Zoi C., Lampros N. Koutas, and Dionysios A. Bournas. “Textile-Reinforced Mortar (TRM) Versus Fiber-Reinforced Polymers (FRP) in Shear Strengthening of Concrete Beams.” Composites Part B: Engineering 77 (August 2015): 338–348. doi:10.1016/j.compositesb.2015.03.055.

Rasheed, M.M. “Retrofit of Reinforced Concrete Deep Beams with Different Shear Reinforcement by Using CFRP.” Civil and Environmental Research Vol.8, No.5, (2016).

El Maaddawy, Tamer, and Sayed Sherif. “FRP Composites for Shear Strengthening of Reinforced Concrete Deep Beams with Openings.” Composite Structures 89, no. 1 (June 2009): 60–69. doi:10.1016/j.compstruct.2008.06.022.

Alsadat Asghari, Azadeh, Zahra Tabrizian, Morteza Hossein Ali Beigy, Gholamreza Ghodrati Amiri, and Bahram Navayineya. "An experimental study on shear strengthening of RC lightweight deep beams using CFRP." Journal of Rehabilitation in Civil Engineering 2, no. 2 (2014): 9-19. doi:10.22075/JRCE.2014.204.

Lee, H.K., S.H. Cheong, S.K. Ha, and C.G. Lee. “Behavior and Performance of RC T-Section Deep Beams Externally Strengthened in Shear with CFRP Sheets.” Composite Structures 93, no. 2 (January 2011): 911–922. doi:10.1016/j.compstruct.2010.07.002.

Burningham, Clayton A., Chris P. Pantelides, and Lawrence D. Reaveley. “Repair of Reinforced Concrete Deep Beams Using Post-Tensioned CFRP Rods.” Composite Structures 125 (July 2015): 256–265. doi:10.1016/j.compstruct.2015.01.054.

Breveglieri, M., A. Aprile, and J.A.O. Barros. “Embedded Through-Section Shear Strengthening Technique Using Steel and CFRP Bars in RC Beams of Different Percentage of Existing Stirrups.” Composite Structures 126 (August 2015): 101–113. doi:10.1016/j.compstruct.2015.02.025.

Mostofinejad, Davood, and Masoud Shameli. “Performance of EBROG Method under Multilayer FRP Sheets for Flexural Strengthening of Concrete Beams.” Procedia Engineering 14 (2011): 3176–3182. doi:10.1016/j.proeng.2011.07.401.

Chen, Hui, Wei-Jian Yi, and Hyeon-Jong Hwang. “Cracking Strut-and-Tie Model for Shear Strength Evaluation of Reinforced Concrete Deep Beams.” Engineering Structures 163 (May 2018): 396–408. doi:10.1016/j.engstruct.2018.02.077.

Liu, Jian, and Boyan I. Mihaylov. “A Comparative Study of Models for Shear Strength of Reinforced Concrete Deep Beams.” Engineering Structures 112 (April 2016): 81–89. doi:10.1016/j.engstruct.2016.01.012.

Hanoon, Ammar N., M.S. Jaafar, Salah R. Al Zaidee, Farzad Hejazi, and F.N.A. Abd Aziz. “Effectiveness Factor of the Strut-and-Tie Model for Reinforced Concrete Deep Beams Strengthened with CFRP Sheet.” Journal of Building Engineering 12 (July 2017): 8–16. doi:10.1016/j.jobe.2017.05.001.

Hussein, G., Sayed H. Sayed, Nasr E. Nasr, and Ahmed M. Mostafa. “Effect of Loading and Supporting Area on Shear Strength and Size Effect of Concrete Deep Beams.” Ain Shams Engineering Journal 9, no. 4 (December 2018): 2823–2831. doi:10.1016/j.asej.2017.11.002.

Yoo, Doo-Yeol, and Jun-Mo Yang. “Effects of Stirrup, Steel Fiber, and Beam Size on Shear Behavior of High-Strength Concrete Beams.” Cement and Concrete Composites 87 (March 2018): 137–148. doi:10.1016/j.cemconcomp.2017.12.010.

Moradi, M., and M. Reza Esfahani. “Application of the Strut-and-Tie Method for Steel Fiber Reinforced Concrete Deep Beams.” Construction and Building Materials 131 (January 2017): 423–437. doi:10.1016/j.conbuildmat.2016.11.042.

Islam, M.R., M.A. Mansur, and M. Maalej. “Shear Strengthening of RC Deep Beams Using Externally Bonded FRP Systems.” Cement and Concrete Composites 27, no. 3 (March 2005): 413–420. doi:10.1016/j.cemconcomp.2004.04.002.

Hu, Biao, and Yu-Fei Wu. “Effect of Shear Span-to-Depth Ratio on Shear Strength Components of RC Beams.” Engineering Structures 168 (August 2018): 770–783. doi:10.1016/j.engstruct.2018.05.017.

Albidah, Abdulrahman, Aref Abadel, Husain Abbas, Tarek Almusallam, and Yousef Al-Salloum. “Experimental and Analytical Study of Strengthening Schemes for Shear Deficient RC Deep Beams.” Construction and Building Materials 216 (August 2019): 673–686. doi:10.1016/j.conbuildmat.2019.05.024.

Zhang, Fasheng, Yining Ding, Jing Xu, Yulin Zhang, Weiqing Zhu, and Yunxing Shi. “Shear Strength Prediction for Steel Fiber Reinforced Concrete Beams Without Stirrups.” Engineering Structures 127 (November 2016): 101–116. doi:10.1016/j.engstruct.2016.08.012.

Colotti, Vincenzo. “Mechanical Shear Strength Model for Reinforced Concrete Beams Strengthened with FRP Materials.” Construction and Building Materials 124 (October 2016): 855–865. doi:10.1016/j.conbuildmat.2016.07.146.

. Dhahir, Mohammed Kareem. “Shear Strength of FRP Reinforced Deep Beams Without Web Reinforcement.” Composite Structures 165 (April 2017): 223–232. doi:10.1016/j.compstruct.2017.01.039.

Elsanadedy, Hussein M., Yousef A. Al-Salloum, Tarek H. Almusallam, Abdulhafiz O. Alshenawy, and Husain Abbas. “Experimental and Numerical Study on FRP-Upgraded RC Beams with Large Rectangular Web Openings in Shear Zones.” Construction and Building Materials 194 (January 2019): 322–343. doi:10.1016/j.conbuildmat.2018.10.238.

Chen, Cheng-Cheng, Keng-Ta Lin, and Yu-Jen Chen. “Behavior and Shear Strength of Steel Shape Reinforced Concrete Deep Beams.” Engineering Structures 175 (November 2018): 425–435. doi:10.1016/j.engstruct.2018.08.045.

Amin, Ali, and Stephen J. Foster. “Shear Strength of Steel Fibre Reinforced Concrete Beams with Stirrups.” Engineering Structures 111 (March 2016): 323–332. doi:10.1016/j.engstruct.2015.12.026.


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DOI: 10.28991/cej-2019-03091388

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Copyright (c) 2019 Osama Megahed El Battawy, Khaled Farouk El Kashif, Hany Ahmed Abdalla

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