Transactions on Transport Sciences 2008, 1(3):97-102 | DOI: 10.5507/tots.2008.014

Causes of long-term deflections of large-span pre-stressed concrete box girders and recommendations on how to avoid these

V. Křístek*, L. Vráblík, V. Hrdoušek
Czech Technical University in Prague, Czech Republic

The results of the presented solutions and the developed analytical and design methods will help in creating the sufficient theoretical tools for the reliable and economic structural design of bridges without deflection impairments. The paper reviews the causes of under-estimation of long-term future deflections. Special attention is placed on prestressing - a procedure to find the optimal arrangement of tendon layout - is presented, facilitating the avoidance of tendons contributing to deflection increases. A developed computer program is freely available and a method of repair procedure and a repair example, as well as recommendations for the design practice are also presented.

Keywords: bridge, creep, deflection, pre-stressed concrete, shear

Published: September 1, 2008  Show citation

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Křístek, V., Vráblík, L., & Hrdoušek, V. (2008). Causes of long-term deflections of large-span pre-stressed concrete box girders and recommendations on how to avoid these. Transactions on Transport Sciences, 1(3), 97-102. doi: 10.5507/tots.2008.014
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    References

    1. Křístek, V., Vráblík, L, Bažant, Z.P., Li, G., Yu, Q., 2008. Mis-prediction of Long-Term Deflections of Prestressed Box Girders: Causes, Remedies and Tendon Layout Effect, Proc.of Concreep8.
    2. Bažant, Z.P. 2000. Criteria for rational prediction of creep and shrinkage of concrete. Adam Neville Symposium: Creep and Shrinkage - Structural Design Effects, ACI SP-194, A. Al-Manaseer, ed., Am. Concrete Institute, Farmington Hills, Michigan, 237-260 (updated from Materials and Structures, RILEM, Paris, Vol. 28, pp. 357-365).
    3. Bažant, Z.P., and Baweja, S. 2000. Creep and shrinkage prediction model for analysis and design of concrete structures: Model B3. Adam Neville Symposium: Creep and Shrinkage-Structural Design Effects, ACI SP-194, A. Al-Manaseer, ed., Am. Concrete Institute, Farmington Hills, Michigan, 1-83.
    4. Křístek, V., Bažant, Z.P., Zich, M., and Kohoutková, 2006. Box girder deflections: Why is the initial trend deceptive? ACI Concrete International 28 (1), 55-63.
    5. Křístek, V., Vráblík, L., 2007: Optimization of tendon layout to avoid excessive deflections of long-span pre-stressed concrete bridges, Concrete Engineering International, Vol. 11, No.1. Go to original source...

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