BEHAVIOR OF CONCRETE BEAMS REINFORCED IN SHEAR WITH CARBON FIBER REINFORCED POLYMER
Main Article Content
Abstract
Carbon fiber reinforced polymers (CFRP) were widely used in strengthening reinforced concrete members
in the last few years, these fibers consist mainly of high strength fibers which increase the member capacity in addition to changing the mode of failure of the reinforced concrete beams. Experimental and theoretical investigations were carried to find the behavior of reinforced concrete beams strengthened by CFRP in shear and bending. The experimental work included testing of 12 beams divided into 4 groups; each group contains 3 beams. The following parameters were taken into consideration: - Concrete crushing strength. - CFRP strengthening location (shear strengthening and both shear and flexure strengthening). Reinforced beams were simply supported subjected to two point loads. Each group consists of three beams; the first beam without CFRP, the second one, is strengthened with CFRP in shear and the third is strengthened with CFRP in both flexure and shear. Four groups with different crushing strength of (12, 20, 30 and 39 MPa). The CFRP sheets are attached externally.
It was found that in beam with low crushing strength loads transfer to the CFRP at early stages while in
those of high crushing strength, CFRP contribution only starts when full strength of the beam is fulfilled. A
full bond between CFRP sheets and the concrete is assumed in the theoretical analysis. Comparison between the theoretical and the experimental results revealed the validity of the numerical analysis and the developed methods such that there was a difference of 13% in the ultimate strength for the tested and analyzed beams.
Article Details
How to Cite
Publication Dates
References
• ACI Committee 318, 2002, “PCA Notes on ACI 318-02 Building Code Requirement for Structural Concrete,” American Concrete Institute.
• ACI Committee 318, 2008, “Building Code Requirement for Structural Concrete (ACI 318-08) and Commentary,”
American Concrete Institute, Farmington Hills.
• ACI Committee 440, 2002, “Guide for the design and construction of externally bonded FRP systems for strengthening of concrete structures,” American Concrete Institute, Michigan, USA.
• Al-Mahaidi, R., Lee, K., and Taplin, G., "Behavior and Analysis of RC T-Beams Partially Damaged in Shear and Repaired
with CFRP Laminates", Monash University, Australia; 2001, almahaidi@ eng.monash.edu.au
• ANSYS, 2005, “ANSYS Help,” Release10.
• Kachlakev, D., Miller, T., "Finite Element Modeling of Reinforced Concrete Structures Strengthened With FRP Laminates", Final Report, Oregon Department of Transportation, May, 2001.