Bond Behavior of Concrete-Filled Steel Tubes at Elevated Temperatures
Publication: Journal of Structural Engineering
Volume 143, Issue 11
Abstract
Extensive studies have been conducted into the bond behavior in concrete-filled steel tubes (CFST) at ambient temperature. However, the bond behavior of CFST columns subjected to fire is still unclear. A total of 24 push-out tests were conducted to investigate the bond strength of CFST columns at elevated temperatures, 12 reference specimens at ambient temperature, and 16 postfire specimens were also tested for comparison. The main test parameters explored in this test program include: steel type (carbon and stainless steels), concrete type (normal and expansive concretes), cross-section type (circular and square sections), interface type (normal interface, interface with shear studs, and interface with an internal ring), temperature level (20, 200, 400, 600, and 800°C), hold time period of heating (45, 90, 135, and 180 min), and applied axial load during heating. The experimental results indicated that the bond of specimens with normal interface could be completely broken in fire. However, welding internal rings or shear studs onto the inner surface of the steel tube can effectively retain a portion of the bond strength in fire.
Get full access to this article
View all available purchase options and get full access to this article.
Acknowledgments
This work is supported by the Australian Research Council (ARC) under its Discovery scheme (Project No. DP120100971). It has also been partially supported by the National Natural Science Foundation of China (Grant No. 51408134). The financial support is gratefully acknowledged. The authors would also like to express special thanks to Mr. Andrew David Lee and Mr. Alec Cutts for their assistance in the experiments.
References
Aly, T., Elchalakani, M., Thayalan, P., and Patnaikuni, I. (2010). “Incremental collapse threshold for pushout resistance of circular concrete filled steel tubular columns.” J. Constr. Steel Res., 66(1), 11–18.
Bhadeshia, H., and Honeycombe, R. (2006). Steels, microstructure and properties, 3rd Ed., Butterworth-Heinemann, Oxford, U.K.
CEN (European Committee for Standardization). (2004). “Design of composite steel and concrete structures. 1–1: General rules and rules for buildings.”, Brussels, Belgium.
CEN (European Committee for Standardization). (2005). “Design of composite steel and concrete structures. 1–2: General rules-structural fire design.”, Brussels, Belgium.
Chang, X., Huang, C. K., Jiang, D. C., and Song, Y. C. (2009). “Push-out test of pre-stressing concrete filled circular steel tube columns by means of expansive cement.” Constr. Build. Mater., 23(1), 491–497.
Culfik, M. S., and Ozturan, T. (2010). “Mechanical properties of normal and high strength concretes subjected to high temperatures and using image analysis to detect bond deteriorations.” Constr. Build. Mater., 24(8), 1486–1493.
Ding, J., and Wang, Y. C. (2008). “Realistic modelling of thermal and structural behaviour of unprotected concrete filled tubular columns in fire.” J. Constr. Steel Res., 64(10), 1086–1102.
Gardner, L. (2005). “The use of stainless steel in structures.” Prog. Struct. Eng. Mater., 7(2), 45–55.
Jaspart, J. P. (1991). “Study of the semi-rigidity of beam-to-column joints and its influence on the resistance and stability of steel buildings.” Ph.D. thesis, Liège Univ., Liège, Belgium.
Petrus, C., Abdul Hamid, H., Ibrahim, A., and Nyuin, J. D. (2011). “Bond strength in concrete filled built-up steel tube columns with tab stiffeners.” Can. J. Civil Eng., 38(6), 627–637.
Qu, X. S., Chen, Z. H., Nethercot, D. A., Gardner, L., and Theofanous, M. (2013). “Load-reversed push-out tests on rectangular CFST columns.” J. Constr. Steel Res., 81(3), 35–43.
Roeder, C. W., Cameron, B., and Brown, C. B. (1999). “Composite action in concrete filled tubes.” J. Struct. Eng., 477–484.
Shakir-Khalil, H. (1993). “Pushout strength of concrete-filled steel hollow sections.” Struct. Eng., 71(13), 230–243.
Song, T. Y., Han, L. H., and Yu, H. X. (2010). “Concrete filled steel tube stub columns under combined temperature and loading.” J. Constr. Steel Res., 66(3), 369–384.
Standards Australia. (2004). “Bridge design. Part 6: Steel and composite construction.” AS5100.6, Sydney, Australia.
Tao, Z., Han, L. H., Uy, B., and Chen, X. (2011). “Post-fire bond between the steel tube and concrete in concrete-filled steel tubular columns.” J. Constr. Steel Res., 67(3), 484–496.
Tao, Z., Song, T. Y., Uy, B., and Han, L. H. (2016). “Bond behavior in concrete-filled steel tubes.” J. Constr. Steel Res., 120(4), 81–93.
Tao, Z., Wang, X. Q., and Uy, B. (2012). “Stress-strain curves of structural and reinforcing steels after exposure to elevated temperatures.” J. Mater. Civil Eng., 1306–1316.
Virdi, K. S., and Dowling, P. J. (1980). “Bond strength in concrete filled steel tubes.” IABSE Proc., P-33/80, International Association for Bridge and Structural Engineering, Zurich, Switzerland, 125–139.
Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 143 • Issue 11 • November 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Nov 9, 2016
Accepted: May 12, 2017
Published online: Aug 25, 2017
Published in print: Nov 1, 2017
Discussion open until: Jan 25, 2018
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.