Numerical Model for the Analysis of Unbonded Prestressed Members
Publication: Journal of Structural Engineering
Volume 132, Issue 1
Abstract
A numerical model for the study of prestressed members with bonded and unbonded tendons has been implemented, considering the hybrid type finite element formulation for planar frames. With such an approach, accurate curvature distributions are obtained, allowing a good computational performance and an adequate unbonded tendon stresses evaluation. The computer program also includes geometric nonlinearity, composite construction, and time-dependent effects. Linear Maxwell chain models are used for both concrete and prestressed steel time-dependent behavior. This paper presents a general description of the numerical model proposed, including the structural idealization approach, a hybrid type finite element formulation review, the material constitutive models, and the main numerical procedures. A brief review of the behavior of unbonded prestressed members is also presented. Numerical and experimental results are compared, showing the good performance of the model for the analysis of unbonded prestressed elements. Unbonded tendon stresses and cracking pattern results are included, showing the capability of the numerical model. The model is proposed as an efficient analytical tool for further research on unbonded prestressed members.
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Acknowledgment
The writers would like to thank CNPq (Brazilian Research Council) for providing financial support for this study.
References
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 132 • Issue 1 • January 2006
Pages: 34 - 42
Copyright
© 2006 ASCE.
History
Received: May 14, 2003
Accepted: Feb 14, 2005
Published online: Jan 1, 2006
Published in print: Jan 2006
Notes
Note. Associate Editor: Dat Duthinh
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