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Steel and Composite Structures Volume 39, Number 1, April10 2021 , pages 21-33 DOI: https://doi.org/10.12989/scs.2021.39.1.021 |
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Long-term deflection prediction in steel-concrete composite beams |
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Tiejiong Lou, Sishun Wu, Theodore L. Karavasilis and Bo Chen
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| Abstract | ||
| This paper aims to improve the current state-of-the-art in long-term deflection prediction in steel-concrete composite beams. The efficiency of a time-dependent finite element model based on linear creep theory is verified with available experimental data. A parametric numerical study is then carried out, which focuses on the effects of concrete creep and/or shrinkage, ultimate shrinkage strain and reinforcing bars in the slab. The study shows that the long-term deformations in composite beams are dominated by concrete shrinkage and that a higher area of reinforcing bars leads to lower long-term deformations and steel stresses. The AISC model appears to overestimate the shrinkage-induced deflection. A modified ACI equation is proposed to quantify time-dependent deflections in composite beams. In particular, a modified reduction factor reflecting the influence of reinforcing bars and a coefficient reflecting the influence of ultimate shrinkage are introduced in the proposed equation. The long-term deflections predicted by this equation and the results of extensive numerical analyses are found to be in good agreement. | ||
| Key Words | ||
| composite beam; shrinkage; creep; time-dependent deflection; time-dependent design | ||
| Address | ||
| Tiejiong Lou, Sishun Wu and Bo Chen: Hubei Key Laboratory of Roadway Bridge & Structure Engineering, Wuhan University of Technology, 430070 Wuhan, China Theodore L. Karavasilis: Department of Civil Engineering, University of Patras, GR-26500 Patras, Greece | ||