Effects of Core Concrete Initial Imperfection on Performance of Eccentrically Loaded CFST Columns
Publication: Journal of Structural Engineering
Volume 142, Issue 12
Abstract
Gap between the outer steel tube and core concrete is a type of initial imperfection that may exist in concrete-filled steel tubular (CFST) columns. This paper is devoted to investigate the influence of the gap on the performance of eccentrically loaded CFST columns. Twelve CFST column specimens and two reference hollow steel tubes were tested under eccentric compression. The main test parameters included the gap type (circumferential and circular-segment) and gap ratio. A finite element model was established to simulate the behavior of the CFST columns with gaps, and the model was validated against the experimental results in terms of failure mode, load versus deformation response, and ultimate strength. Based on the experimental and numerical investigations, the performance of eccentrically loaded CFST columns with gaps was analyzed. Parametric studies were then conducted to reveal the influence of different parameters on the ultimate strength of the CFST columns with gaps. Finally, the maximum allowable gap ratio in practice was proposed for the eccentrically loaded CFST columns with circumferential gaps, and a simplified model was proposed to predict the ultimate strength of the composite columns.
Get full access to this article
View all available purchase options and get full access to this article.
Acknowledgments
The research presented in this paper is financially supported by the National Natural Science Foundation of China (Grant No. 51108084) and Project Funded by China Postdoctoral Science Foundation (Grant No. 2015M571044). The support is greatly appreciated.
References
ABAQUS [Computer software]. Simulia, Providence, RI.
AISC. (2010). “Specification for structural steel buildings.” ANSI/AISC 360-10, Chicago.
Attard, M. M., and Setunge, S. (1996). “Stress-strain relationship of confined and unconfined concrete.” ACI Mater. J., 93(5), 432–442.
CEN (European Committee for Standardization). (2005). “Design of composite steel and concrete structures.” Eurocode 4, Brussels, Belgium.
Han, L. H., Li, W., and Bjorhovde, R. (2014). “Developments and advanced applications of concrete-filled steel tubular (CFST) structures: Members.” J. Constr. Steel Res., 100, 211–228.
Han, L. H., and Yao, G. H. (2003). “Influence of concrete compaction on the strength of concrete-filled steel RHS columns.” J. Constr. Steel Res., 59(6), 751–767.
Han, L. H., Yao, G. H., and Tao, Z. (2007). “Performance of concrete-filled thin-walled steel tubes under pure torsion.” Thin Walled Struct., 45(1), 24–36.
Han, L. H., Zhao, X. L., and Tao, Z. (2001). “Tests and mechanics model for concrete filled SHS stub columns, columns and beam-columns.” Steel Compos. Struct., 1(1), 51–74.
Housing and Urban-Rural Development Department of Fujian Province, China. (2010). “Technical specifications for concrete-filled steel tubular structures (revised version).”, Fuzhou, China (in Chinese).
Lam, D., and Gardner, L. (2008). “Structural design of stainless steel concrete filled columns.” J. Constr. Steel Res., 64(11), 1275–1282.
Lee, S. H., Uy, B., Kim, S. H., Choi, Y. H., and Choi, S. M. (2011). “Behavior of high-strength circular concrete-filled steel tubular (CFST) column under eccentric loading.” J. Constr. Steel Res., 67(1), 1–13.
Liao, F. Y., Han, L. H., and He, S. H. (2011). “Behavior of CFST short column and beam with initial concrete imperfection: Experiments.” J. Constr. Steel Res., 67(12), 1922–1935.
Liao, F. Y., Han, L. H., and Tao, Z. (2013). “Behavior of CFST stub columns with initial concrete imperfection: Analysis and calculations.” Thin Walled Struct., 70, 57–69.
Liew, J. Y. R., and Xiong, D. X. (2009). “Effect of preload on the axial capacity of concrete-filled composite columns.” J. Constr. Steel Res., 65(3), 709–722.
McCann, F., Gardner, L., and Qiu, W. (2015). “Experimental study of slender concrete-filled elliptical hollow section beam-columns.” J. Constr. Steel Res., 113, 185–194.
Muciaccia, G., Giussani, F., Rosati, G., and Mola, F. (2011). “Response of self-compacting concrete filled tubes under eccentric compression.” J. Constr. Steel Res., 67(5), 904–916.
Patel, V. I., Liang, Q. Q., and Hadi, M. N. S. (2012a). “High strength thin-walled rectangular concrete-filled steel tubular slender beam-columns. Part I: Modeling.” J. Constr. Steel Res., 70, 377–384.
Patel, V. I., Liang, Q. Q., and Hadi, M. N. S. (2012b). “High strength thin-walled rectangular concrete-filled steel tubular slender beam-columns. Part II: Behavior.” J. Constr. Steel Res., 70, 368–376.
Perea, T., Leon, R., Hajjar, J., and Denavit, M. (2014). “Full-scale tests of slender concrete-filled tubes: Interaction behavior.” J. Struct. Eng., 04014054.
Roeder, C. W., Cameron, B., and Brown, C. B. (1999). “Composite action in concrete filled tubes.” J. Struct. Eng., 477–484.
Sheehan, T., Dai, X. H., Chan, T. M., and Lam, D. (2012). “Structural response of concrete-filled elliptical steel hollow sections under eccentric compression.” Eng. Struct., 45, 314–323.
Young, B., and Ellobody, E. (2006). “Experimental investigation of concrete-filled cold-formed high strength stainless steel tube columns.” J. Constr. Steel Res., 62(5), 484–492.
Zubydan, A. H., and ElSabbagh, A. I. (2011). “Monotonic and cyclic behavior of concrete-filled steel-tube beam-columns considering local buckling effect.” Thin Walled Struct., 49(4), 465–481.
Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 142 • Issue 12 • December 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Dec 30, 2015
Accepted: May 3, 2016
Published online: Jul 15, 2016
Published in print: Dec 1, 2016
Discussion open until: Dec 15, 2016
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.