Abstract
The study presents the results of an experimental investigation conducted on Steel Fiber Reinforced Concrete (SFRC) beams with externally bonded Glass Fiber Reinforced Polymer (GFRP) laminates with a view to study their strength and ductility. A total of ten beams, 150×250 mm in cross-section were tested in the laboratory over an effective span of 2800 mm. Three fiber reinforced concrete beams were used as reference beams. Six fiber reinforced concrete beams were provided with externally bonded GFRP laminates. One concrete beam was left virgin without any fiber reinforcement and external GFRP laminates. All the beams were tested until failure. The variables considered included volume fraction of fiber reinforcement and stiffness of GFRP laminates. The static responses of all the beams were evaluated in terms of strength, stiffness and ductility. The test results show that the beams provided with externally bonded GFRP laminates exhibit improved performance over the beams with internal fiber reinforcement.
Highlights
Ductility is defined as the ratio of ultimate deformation to yield deformation
From the test results on steel fiber reinforced concrete beams strengthened with Glass Fiber Reinforced Polymer (GFRP) laminates, the following conclusions are drawn:
The Steel Fiber Reinforced Concrete (SFRC) beams with external GFRP laminates exhibit a maximum increase of 46% in ultimate load capacity with respect to the SFRC beams
Summary
Ductility is defined as the ratio of ultimate deformation to yield deformation. The most important aspect of ductility. Attari et al (2008) studied the performance of reinforced concrete beams strengthening with hybrid FRP laminates In the study, they have evaluated the contribution of the external reinforcement of concrete beams, reinforced by hybrid FRP laminates, which consist of the combination of one-way glass and carbon fibers as well as a bidirectional hybrid fabric glass carbon on their performance in term of ductility, strength and mode of failure. They have evaluated the contribution of the external reinforcement of concrete beams, reinforced by hybrid FRP laminates, which consist of the combination of one-way glass and carbon fibers as well as a bidirectional hybrid fabric glass carbon on their performance in term of ductility, strength and mode of failure They concluded that the combination of the strengthening laminates GFRP and CFRP noticeably increase the ultimate load capacity and stiffness of the beams and it is an effective method to enhance their ductility. He concluded that use of CFRP laminates increases the load carrying
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