Creep-Prediction Models for Concrete-Filled Steel Tube Arch Bridges
Publication: Journal of Bridge Engineering
Volume 22, Issue 7
Abstract
Several concrete-filled steel tube (CFT) arch bridges have been built over the past few years around the world. Current design codes do not address the design of CFT arch bridges, particularly with consideration of concrete creep effects, which can be very important. This paper presents experimental results from tests conducted on 13 specimens to evaluate the creep behavior of CFT members. An experimental database was compiled using results from this paper and 35 additional tests from the literature. The comprehensive database was used to evaluate four commonly used creep models for predicting short-term (up to 730 days) creep strains of the concrete infill in CFT members. The selected models are the Comité Euro International du Béton–Fédération Internationale de la Précontrainte (CEB-FIP) MC90 model, fédération internationale du béton (fib) MC2010 model, American Concrete Institute (ACI) 209 R-92 model, and the B4 model. The evaluations indicate that the prediction quality varies by cases. Therefore, it is not possible to recommend a most-suitable model based on this study. Further investigations are required to evaluate the effects of factors such as the steel ratio. To evaluate the effects of creep on the time-dependent behavior of CFT arch bridges, creep analyses on 11 such bridges were conducted with the implemented ACI 209 R-92 creep model. Analytical results indicate that creep results in increases in the steel tube stresses and bridge deflections and relaxation of concrete stresses.
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Acknowledgments
This research is part of a project (51178118) supported by the Natural Science Foundation of China (NSFC). The support is highly acknowledged.
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Published In
Journal of Bridge Engineering
Volume 22 • Issue 7 • July 2017
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© 2017 American Society of Civil Engineers.
History
Received: Nov 20, 2015
Accepted: Jan 24, 2017
Published online: Apr 18, 2017
Published in print: Jul 1, 2017
Discussion open until: Sep 18, 2017
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