Time-Dependent Behavior of Concrete-Filled Steel Tubular Arch Bridge
Publication: Journal of Bridge Engineering
Volume 15, Issue 1
Abstract
This paper develops a simplified method using a summation procedure and a related computer program to calculate the time-dependent behavior of a concrete filled steel tubular (CFST) arch bridge based on the geometric compatibility principle, a step-by-step time incremental process, and self-equilibrium equations. An experimental test on a scaled (1:5) segmental model of the main arch ribs of the Maocaojie Bridge was used to confirm the effectiveness of the proposed calculation method for evaluating the long-term behavior of CFST arch bridge under sustained load. It is concluded that: (1) the numerical results were in good agreement with the experimental results, demonstrating that the proposed analytical model is capable of predicting long-term effects for CFST arch bridges; (2) the stresses in the steel tubes increased, and the compressive stresses in the concrete decreased due to the effects of concrete creep and shrinkage. The maximum relaxation of the compressive stress in concrete due to concrete creep was 52.7% of the initial concrete stress, and the maximum increase of stress in the steel tubes was 27.3%; and (3) more than 90% of the total creep of the concrete took place in the first year. Subsequent creep of the concrete was limited because of the lack of water exchange between the structure and atmosphere and the reduction of compressive stress in the concrete.
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Acknowledgments
The writers gratefully acknowledge for the support of this research work by the UNSPECIFIEDMinistry of Communications of China on “Key Technology Research on Design, Construction and Maintenance of Concrete Filled Steel Tubular Arch Bridges (200 331 879 82 01).” The help of English revision from Emeritus Professor Adrian Page, who is a Professor of Civil Engineering in The University of Newcastle, Australia, is much appreciated.
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Information & Authors
Information
Published In
Journal of Bridge Engineering
Volume 15 • Issue 1 • January 2010
Pages: 98 - 107
Copyright
© 2010 ASCE.
History
Received: Nov 17, 2006
Accepted: Jul 27, 2009
Published online: Dec 15, 2009
Published in print: Jan 2010
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