Issues‎ > ‎vol4n5en‎ > ‎

sjes-10062


Strengthening of Reinforced Concrete T-Beam with Web Opening.
Bedar Rauf Hassan, Prof. Dr.Mohamed Raouf Abdul-Kadir, Dr. Kawan Karem Ghafoor

3University of Sulaimani, College of Engineering, Civil Engineering Department

Received : 03/07/2017, Accepted : 06/09/2017
DOI Link: https://doi.org/10.17656/sjes.10062
ABSTRACT 

This study examines shear capacity of strengthened reinforced concrete T-beams with web rectangular opening. Effect of opening orientation, presence of flange, different types of strengthening, and absence of shear reinforcement in strengthened beams are discussed and evaluated. The experimental work consisted of testing 13 beams under single point load. One of them considered as control beam without opening, while others are cast as beams with preplanned 100mm×200mm opening located at the web of the beam horizontally and vertically.

The results of the beams indicated that the beams with horizontal openings show reduction in the ultimate shear capacity by about 17% while for vertical opening the reduction was about 27% compared to the control beam without opening .Moreover, the presence of the flange increased the shear capacity of the beams with horizontal and vertical openings by about 11% and 34.5% respectively. Also, the results indicated that the internal strengthening with inclined stirrups increased ultimate capacity by about 18% and 11% for horizontal and vertical openings compared to control T-beams with web opening respectively. The CFRP strips with spacing between them increased shear capacity by about 13.5% for horizontal opening but was not beneficial for vertical opening, also the CFRP strips for strengthening of opening made after construction were not beneficial for both types of opening and the capacity was decreased by about 11.5% and 10.1% for horizontal and vertical opening respectively. Strengthened beams with CFRP strips without spacing between them strengthened the bottom chord of the opening furthermore and they were best scheme of strengthening beam with vertical opening and increased shear capacity by about 12% for both types of opening.

KEYWORDS:   Reinforced Concrete T-Beam, Web Opening, CFRP Strengthening, and Diagonal Reinforcement



REFERENCES
1- Shit T., “Experimental and numerical study on behavior of externally bonded RC T-beams using GFRP composites”, MSc thesis- National institute of technology-Rourkela, January 2011.
2- Mansur M.A., and Tan K.H., “Concrete beams with opening; Analysis and Design”, CRC press LLC, 1th edition, 1999.
3- Vuggumudi S., “Experimental study on shear strengthening of RC T-beams with web openings using FRP composites”, MSc thesis- National institute of technology-Rourkela, January 2013.
4- Panigrahi A.K., “Strengthening of shear deficient RC T-beams with externally bonded FRP sheets”, MSc thesis- National institute of technology-Rourkela, January 2013.
5- Hammad Y.H., Abdel-Rahman G.T., and Said M., “Behavior of RC beams with strengthened openings in D-region”, 9th Arab Structural Engineering conference, December 2003, pp. 163-174.
6- Oukaili N.K., and Shammari A.H., “Response of reinforced concrete beams with multiple web openings to static load”, 4th Asia-Pacific conference on FRP in structures APFIS, December 2013.
7- Oukaili N.K., and Shammari A.H., “CFRP strengthening of RC beams with multiple openings subjected to static and impact loads”, Journal of advances in structural engineering, Vol. 17, No. 12, November 2014, pp. 1747-1760.
8- Routray S., “Shear behavior of BFRP strengthened RC T-beams”, MSc thesis- National institute of technology-Rourkela, June 2015.
9- ASTM standards, “Standard test method for compressive strength of cylindrical concrete specimens”, C 39/C 39M – 05, West Conshohocken, United States, 2007.
10- ACI committee 318M, “Building code requirements for structural concrete”, ACI 318M - 14 and commentary, American concrete institute, Farmington Hills, United States, 2014.
11- ACI committee 440, “Guide for the design and construction of externally bonded FRP systems for strengthening concrete structures”, ACI 440.2 R - 08, American concrete institute, Farmington Hills, United States, July 2008.
12- Wight J.K., and MacGergor J.G., “Reinforced concrete mechanics and design”, Pearson companies, 6th edition, New Jersey, United Stated, 2012.
13- Mansur M.A., Tan K.H., and Wei W., “Analysis of concrete beams with circular web openings using strut-and-tie models”, Malaysian journal of Civil engineering, Vol. 18, No. 2, February   2006, pp.89-98.