Nonlinear Finite-Element Analysis of Posttensioned Concrete Bridge Girders
Publication: Journal of Bridge Engineering
Volume 16, Issue 3
Abstract
Posttensioning is an effective method for the construction of different types of bridge girders such as those used in segmentally erected bridges. Available nonlinear analysis programs for bridge girders under severe loading conditions are computationally expensive though. In addition, they neglect important phenomena such as bond-slip, friction, and anchorage losses. The objective of the proposed work is to develop a new nonlinear finite-element program for analysis of posttensioned bridge girders. The new model overcomes most of the difficulties associated with existing models. The model is based on the computationally efficient mixed formulation and considers bond, friction, and anchorage loss effects. The mixed formulation is characterized by its fast convergence, usually with very few finite elements and its robustness even under severe loading conditions. The posttensioning operation is accurately simulated using a phased-analysis technique, in which each stage of the posttensioning operation is simulated through a complete nonlinear analysis procedure. Correlation studies of the proposed model with experimental results of posttensioned specimens are conducted. These studies confirmed the accuracy and efficiency of the newly developed software program, which represents an advancement over existing commercial software packages for evaluating posttensioned bridge girders, in particular those subjected to severe loading conditions.
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Acknowledgments
The writer would like to express his deepest gratitude to Prof. Filip Filippou at the University of California–Berkeley for his valuable suggestions regarding the development of the proposed work.
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Information
Published In
Journal of Bridge Engineering
Volume 16 • Issue 3 • May 2011
Pages: 479 - 489
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Apr 14, 2009
Accepted: Jul 28, 2010
Published online: Aug 2, 2010
Published in print: May 1, 2011
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