Long-Term Deflections of Reinforced Concrete Beams Externally Bonded with FRP System |
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| Authors: | Kiang Hwee Tan Mithun Kumar Saha |
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| Affiliation: | 1Associate Professor, Dept. of Civil Engineering, National Univ. of Singapore, Blk E1A, No. 07-03, 1 Engineering Dr. 2, Singapore 117576. E-mail: cvetankh@nus.edu.sg
2Ph.D. Candidate, Dept. of Civil Engineering, National Univ. of Singapore, Blk E1A, No. 07-03, 1 Engineering Dr. 2, Singapore 117576. E-mail: g0203442@nus.edu.sg
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| Abstract: | External bonding of fiber-reinforced polymer (FRP) composite laminates to the tension soffit of reinforced concrete beams has become a popular method for flexural strengthening. However, the long-term performance of FRP-bonded beams under service loads is still a concern. This study was therefore aimed at investigating, both analytically and experimentally, the long-term deflection characteristics of FRP-bonded beams under sustained loads. Nine reinforced concrete beams, six of which were externally bonded with glass FRP composite laminates, were subjected to sustained loads for 2 years. The test parameters were the FRP ratio and sustained load level. The long-term deflections of the beams were reduced 23 and 33% with a FRP ratio of 0.64 and 1.92%, respectively. The total beam deflections were accurately predicted by the adjusted effective modulus method, and overestimated by about 20% by the effective modulus method. |
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| Keywords: | Beams Deflection Fiber reinforced polymers Glass fibers Stiffness Bonding |
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