Abstract
An experimental program was conducted to ascertain the efficiency of Carbon Fiber Reinforced Polymer (CFRP) in enhancing the flexural response of hollow section reinforced concrete (RC) beams. Nine beams were tested under four-point bending in three groups. Beams were categorized to reflect the presence or configuration of the CFRP sheet. Each group consisted of three beams: one with a solid section, one with a square mm × mm opening and 1 with mm × mm opening. Beams in 1st group were tested in as-built conditions. Beams in the 2nd group were strengthened with a single CFRP sheet bonded to their bottom sides. Configuration of CFRP sheet was altered to U-shape applied to the tension side of 3rd group beams. The inclusion of openings, regardless of their size, did not result in degradation of ultimate load and corresponding deflections. However, cracking loads were found to decline as the opening size increased. Regardless of the opening size and CFRP configuration, ultimate loads of beams increased with the application of CFRP. However, this improvement was limited to the debonding and rupture of CFRP in group 2 and 3 beams, respectively. A comparison in the behavior of group 2 and 3 beams revealed that the application of the U-shape CFRP sheet yielded better flexural performance in comparison with the flat-CFRP sheet bonded to the bottom of beams. In the end, In order to further evaluate the economic and performance benefits of these beams, the cost-benefit analysis was also performed. The analysis showed that the feasibility of the hollow section RC beams is more than the solid section RC beams.
Highlights
Introduction distributed under the terms andRehabilitation of existing structures or their individual components has been the hub for the past few decades
This paper further aims at investigating fiber reinforced polymer (FRP)
The final failure mode was accompanied by the yielding of longitudinal reinforcement and concrete crushing at the top of its midspan
Summary
Rehabilitation of existing structures or their individual components has been the hub for the past few decades This can be ascribed to many reasons stretching from environmental influences, change in loading magnitudes, deterioration caused by earthquakes to upgrades in order to meet the modern design provisions. Extensive work has been done on the use of steel jacketing [6,7,8,9,10] As much as these conventional methods work effectively for retrofits, some alarming shortcomings associated with them are still inevitable. The Rapid evolution of composite materials in the field of structural rehabilitation is appreciable Their inherited high tensile strengths, corrosion resistance, lightweight, easy to handle, good fatigue, and less labor cost involved make them an excellent alternative to conventional jacketing techniques [13,14,15,16,17]
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