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Structural Engineering and Mechanics Volume 92, Number 2, October25 2024 , pages 133-147 DOI: https://doi.org/10.12989/sem.2024.92.2.133 |
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Connection rotation requirements on FRP-strengthened steel-concrete composite beam systems |
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Panagiotis M. Stylianidis and Michael F. Petrou
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| Abstract | ||
| Composite beams of steel and concrete strengthened with fiber-reinforced polymers (FRP) may exhibit considerably enhanced flexural behaviour, but the combination of three materials with different characteristics and the various possible failure mechanisms that may govern performance make their analysis quite demanding. Previous studies provided significant insights into this problem and several methods were proposed for calculating flexural stiffness and strength, but these studies are restricted to the single member level of a simply supported composite beam section. However, the problem considerably changes when the beam is part of a frame system due to the degree of continuity provided by the surrounding structure, which represents the most common situation in practice. This paper explores the behaviour of semi-continuous FRP-strengthened composite beams, by considering the response characteristics of their end connections and their effects on overall performance. A novel analytical model is derived, which enables a step-by-step representation of the nonlinear relationship between an incremental mid-span design bending moment and corresponding connection rotations. After verification against finite element analyses, a parametric study is conducted which shows that the substantially increased bending moment resistance of FRPstrengthened composite beams can hardly be fully utilized due to a deficiency of corresponding large deformation capacity available in the connections. The extent to which the presence FRP strengthening can be exploited to enhance the beam flexural response depends on the interplay between various structural parameters, including the connection rotation capacity, the beam span, and the FRP modulus of elasticity and ultimate strength. | ||
| Key Words | ||
| analytical modelling; composite action; connection rotation capacity; design bending moment; FRP; plastic analysis; semi-rigid connections; steel frame structures | ||
| Address | ||
| Panagiotis M. Stylianidis: Department of Civil Engineering, Neapolis University Pafos, Paphos 8042, Cyprus Michael F. Petrou: Department of Civil and Environmental Engineering, University of Cyprus, Nicosia 2109, Cyprus | ||