Abstract
The shear capacity of reinforced concrete beams strengthened with web side bonded carbon fiber-reinforced polymer (CFRP) sheets was measured experimentally. Nine reinforced concrete beams without stirrups; three control beams and six beams strengthened with minimal application of web side bonded CFRP sheets, were tested. The test variables were ratio of longitudinal reinforcement (1%, 1.4%, and 2.4%) and angle of application of CFRP sheets (450 and 900). The test results show that reinforced concrete beams strengthened with web side bonded CFRP sheets have higher shear capacity compared to the control beams. Shear capacity of strengthened beams with 450 angle of application of CFRP sheets is similar to that of beams strengthened with 900 angles. Beams with 1% of longitudinal reinforcement ratio failed in flexural mode indicated by concrete crushing in compression zone while beams with higher longitudinal reinforcement ratio (1.4% and 2.4%) failed in brittle mode as indicated by delamination of the concrete cover.
Highlights
In the last decade, Fibre Reinforced Polymer (FRP) sheets have become popular as strengthening materials for damaged reinforced concrete structures
Khalifa et al [3] showed that strengthening using carbon fiber-reinforced polymer (CFRP) sheets increased the shear capacity of reinforced concrete beams
This paper presents the results of an experimental study on shear capacity of reinforced concrete beams without stirrups strengthened using Carbon Fiber Reinforced Polymer (CFRP) sheets
Summary
Fibre Reinforced Polymer (FRP) sheets have become popular as strengthening materials for damaged reinforced concrete structures. Khalifa et al [3] showed that strengthening using CFRP sheets increased the shear capacity of reinforced concrete beams. This phenomenon has been reported by others [4,6,10]. Many research reports related to the application of FRP materials are available, limited information is available regarding behavior associated with shear failure and the minimal application of CFRP sheets needed to strengthen reinforced concrete members against shear forces. This paper presents the results of an experimental study on shear capacity of reinforced concrete beams without stirrups strengthened using Carbon Fiber Reinforced Polymer (CFRP) sheets. The wrapping was bonded to the two opposing web sides of the beam
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