Finite Element Model for Analysis of Time-Dependent Behaviour of Concrete-Filled Steel Tubular Arches

Abstract:

This paper presents a finite element model for the linear and nonlinear analysis of time-dependent behaviour of concrete-filled steel tubular (CFST) arches. It is known when a CFST arch is subjected to a sustained load, the visco-elastic effects of creep in the concrete core will result in significant increases of the deformations and internal forces in the long-term. In this paper, a finite element model is developed using the age-adjusted effective modulus method to describe the creep behaviour of the concrete core. The finite element results of long-term displacement and stress redistribution agree very well with their analytical counterparts. The finite element model is then used to compare the linear and nonlinear results for the long-term behaviour of shallow CFST arches. It is demonstrated that the linear analysis underestimates the long-term deformations and internal force significantly and that to predict the time-dependent behaviour shallow CFST arches accurately, the nonlinear analysis is essential.

• Periodical: Applied Mechanics and Materials (Volume 553)
• Pages: 606-611
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.553.606
• Online since: May 2014
• Authors: Kai Luo*, Yong Lin Pi, Wei Gao, Mark A. Bradford
• Keywords: Buckling, CFST Arch, Creep, Finite Element, Long Term, Time-Dependent

References

[1] Y. L. Pi, M. A. Bradford and W. L. Qu, Long-term nonlinear behaviour and buckling of shallow concrete-filled steel tubular arches, International Journal of Nonlinear Mechanics, 2011(46)1155–1166.

DOI: 10.1016/j.ijnonlinmec.2011.05.003

[2] K. Luo, Y. L. Pi, M. A. Bradford and W. Gao, Long-term in-plane analysis of concrete-filled steel tubular arches under a central concentrated load, in proceedings of the 22nd Australian Conference on the Mechanics of Structures and Materials, ACMSM22, Sydney, Australia.

DOI: 10.1201/b10564-84

[3] ANSYS, Release 13. 0. ANSYS, Inc. Southpointe, 275 Technology Drive, Canonsburg, PA 15317.

DOI: 10.1016/b978-0-12-811768-2.00022-5

[4] R. I. Gilbert, Time-dependent Behaviour of Concrete Structures, in press, Taylor & Francis, London, (2010).

[5] Z. P. Bazant, L. Cedolin, Stability of Structures, Dover Publications, 2003, p.105–109.

[6] ACI Committee 209, Prediction of Creep, Shrinkage and Temperature Effects in Concrete Structures, American Concrete Institute (ACI), Detroit, (1982).

[7] AS3600, Australian Standard: Concrete Structures, Standard Association of Australia, Sydney, (2001).

[8] Z. P. Bazant, Prediction of concrete creep effects using age-adjusted effective modulus method, ACI Structural Journal. 69 (1972) 212–217.

DOI: 10.14359/11265

[9] S. T. Zhong, Concrete-filled Steel Tubular Structures, Heilongjiang Science and Technology Press, (1994).

[10] P. J. Terrey, M. A. Bradford and R. I. Gilbert, Creep and shrinkage of concrete in concrete-filled circular steel tubes, Proceeding of 6th International Symposium on Tubular Structures, 1994, p.293–298.

DOI: 10.1201/9780203735015-43

[11] B. Uy, Static long-term effects in short concrete-filled steel box columns under sustained loading, ACI Structural Journal, 98 (2001) 96–104.

DOI: 10.14359/10151

[12] L. H. Han, Y. F. Yang, and W. Liu, The behaviour of concrete filled steel tubular columns with rectangular section under long-term loading, Journal of Civil Engineering, 37 (2004) 12–18.