Long-Term Behavior of Precast Segmental Cantilever Bridges
Publication: Journal of Bridge Engineering
Volume 11, Issue 3
Abstract
An investigation is conducted to quantify long-term effects on a family of four precast segmental bridges. Segments are prefabricated, transported, and set into place with an appropriate lifting device and a launching gantry. Attention has been paid to the effects of long-term deformations of concrete, to avoid noticeable geometrical variations in its shape but also to account for redistribution of stresses, which creates a difficult analytical problem to solve. An attempt is made to provide a practical treatment of serviceability analyses of this type of concrete structure, having an evolutive process of erection, presenting: (1) an “exact” incremental step-by-step time approach; (2) a simplified approach for the inclusion of time dependent effects of creep and shrinkage; and (3) a comparison of both approaches, in order to treat these kinds of problems by means of a simplified approach.
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Acknowledgments
The writer thanks the editor and the reviewers for their helpful comments on previous versions of the paper. The study was performed during the aforementioned bridges’ final design phase, developed by the office Carlos Fernández Casado, S.L., under the supervision of Dr. Eng. Leonardo Fernández Troyano and in close collaboration with the main contractor, Fomento de Construcciones y Contratas, represented by Dr. Eng. J. I. González Esteban, who was mainly responsible for execution details during bridge construction.
References
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Kang, Y. J. (1977). “Nonlinear geometric, material, and time-dependent analysis of reinforced and prestressed concrete frames.” Ph.D. thesis, Univ. of California at Berkeley, Berkeley, Calif.
Mathivat, J. (1983). The cantilever construction of prestressed concrete bridges, Wiley, New York, 115–125.
Millanes, F. J., and Martínez Calzón, J. (1989). “Automatic evolutive analysis of complex composite bridges and systems.” J. Struct. Eng., 115(10), 2548–2555.
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Information & Authors
Information
Published In
Journal of Bridge Engineering
Volume 11 • Issue 3 • May 2006
Pages: 340 - 349
Copyright
© 2006 ASCE.
History
Received: Jul 28, 2003
Accepted: Jun 1, 2005
Published online: May 1, 2006
Published in print: May 2006
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