| Summary: | 碩士 === 國立暨南國際大學 === 土木工程學系 === 92 === The objective of this research is to apply FEM to study RC structures strengthened with composite laminates. First, the commercial finite element software ANSYS is used to simulate three-dimensional CFRP (carbon fiber reinforced polymers) strengthened RC beams. Influence of fiber orientation, CFRP length, and numbers of layers on the flexural stiffness on CFRP strengthened RC beams are investigated. The results show that CFRP laminates significantly increase the flexural stiffness and ultimate load capacity. The delamination between CFRP laminates and concrete may occur due to the concentration of normal and shear stresses at the end of the CFRP laminates. The magnitude of stress concentration increases with decreasing length of CFRP laminates and increasing numbers of layers. The RC beams strengthened with various fiber orientation of CFRP on both sides of the beam are considered next to investigate. The results indicate the CFRP laminates with 45∘fiber orientation give the best enhancement on the shear strength while CFRP with 90∘fiber orientation has second best performance. Finally, the beam-column structures strengthened with CFRP are investigated. The distributions of normal and shear stresses are studied for strengthened beam-column structures with various bonding types and fiber orientation. The results show that the concentration of normal and shear stresses exist at the corner of the beam-column joint, while greater shear stress is found on the joint section. The magnitude of stress at the joint can be reduced by CFRP, while the shearing strength and stiffness of connections are increased. The research can provide analytical guidance in the practical design of RC structures strengthened with CFRP.
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