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Structural Engineering and Mechanics Volume 35, Number 5, July30 2010 , pages 631-643 DOI: https://doi.org/10.12989/sem.2010.35.5.631 |
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Numerical analysis of second-order effects of externally prestressed concrete beams |
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Tiejiong Lou and Yiqiang Xiang
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| Abstract | ||
| A numerical procedure for the geometrical and material nonlinear analysis of concrete beams prestressed with external tendons is described, where the effects of external prestressing are treated as the equivalent loads applied on the concrete beams. The geometrical nonlinearity is considered not only the eccentricity variations of external tendons (second-order effects) but also the large displacement effects of the structure. The numerical method can predict the nonlinear response of externally prestressed concrete beams throughout the entire loading history with considerable accuracy. An evaluation of second-order effects of externally prestressed concrete beams is carried out using the proposed analysis. The analysis shows that the second-order effects have significant influence on the response characteristics of externally prestressed concrete beams. They lead to inferior ultimate load and strength capacities and a lower ultimate stress increase in tendons. Based on the current analysis, it is recommended that, for simplysupported externally prestressed beams with straight horizontal tendons, one deviator at midspan instead of two deviators at one-third span be furnished to minimize these effects. | ||
| Key Words | ||
| external tendons; prestressed concrete beams; second-order effects; response; numerical analysis. | ||
| Address | ||
| Tiejiong Lou: Department of Structural and Geotechnical Engineering, Politecnico di Torino, Torino 10129, Italy Yiqiang Xiang: Department of Civil Engineering, Zhejiang University, Hangzhou 310058, P.R. China | ||