Concrete Beams Strengthened with Misaligned CFRP Laminates
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Published:2001
Xinbao Yang, Antonio Nanni, 2001. "Concrete Beams Strengthened with Misaligned CFRP Laminates", FRPRCS-5: Fibre-reinforced plastics for reinforced concrete structures Volume 1: Proceedings of the fifth international conference on fibre-reinforced plastics for reinforced concrete structures, Cambridge, UK, 16–18 July 2001, Chris J. Burgoyne
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A unidirectional carbon fiber reinforced polymer (CFRP) laminate has its maximum strength and stiffness in the fiber direction. However, misalignment of fibers can be introduced intentionally or unintentionally during design or construction of structures. In this paper, the effect of fiber misalignment on the performance of concrete beams strengthened with CFRP laminates is experimentally investigated. Five unreinforced concrete Tee beams were cast and strengthened with CFRP laminates. The laminates had an off-axis angle of 0, 2, 5, 8, and 10°, respectively. The beams were tested under four-point loading to total failure. The objectives of this research were to investigate (1) strength and stiffness of beams, (2) strain distribution of CFRP laminates and, (3) failure modes. It was found that the variation of beam capacity with the severity of misalignment showed a different trend from that of midspan deflection and that failure by rupture of the CFRP laminate was experienced by all beams. A bond length of 127 mm was sufficient to develop the strength of the CFRP laminate.
INTRODUCTION
EXPERIMENTAL PROGRAM
TEST RESULTS
CONCLUSIONS
ACKNOWLEDGEMENT
REFERENCES
