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Computers and Concrete Volume 12, Number 6, December 2013 , pages 739-754 DOI: https://doi.org/10.12989/cac.2013.12.6.739 |
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Effects of cyclic loading on the long-term deflection of prestressed concrete beams |
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Lihai Zhang, Priyan Mendis, Wong Chon Hon, Sam Fragomeni, Nelson Lam and Yilun Song
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| Abstract | ||
| Creep and shrinkage have pronounced effects on the long-term deflection of prestressed concrete members. Under repeated loading, the rate of creep in prestressed concrete members is often accelerated. In this paper, an iterative computational procedure based on the well known Model B3 for creep and shrinkage was developed to predict the time-dependent deflection of partially prestressed concrete members. The developed model was validated using the experimental observed deflection behavior of a simply supported partially prestressed concrete beam under repeated loading. The validated model was then employed to make predictions of the long-term deflection of the prestressed beams under a variety of conditions (e.g., water cement ratio, relatively humidity and time at drying). The simulation results demonstrate that ignoring creep and shrinkage could lead to significant underestimation of the long-term deflection of a prestressed concrete member. The model will prove useful in reducing the long-term deflection of the prestressed concrete members via the optimal selection of a concrete mix and prestressing forces. | ||
| Key Words | ||
| shrinkage; creep; prestressed concrete beams; cyclic loading | ||
| Address | ||
| Lihai Zhang, Priyan Mendis, Wong Chon Hon, Nelson Lam and Yilun Song: Department of Infrastructure Engineering, The University of Melbourne, VIC 3010, Australia Sam Fragomeni: Department of Civil Engineering, Victoria University, VIC 3010, Australia | ||