New Mechanism of Load Introduction into Concrete-Filled Steel Tubular Columns
Publication: Journal of Structural Engineering
Volume 142, Issue 6
Abstract
This paper presents the results of new load-introduction tests and numerical simulations to investigate the mechanism of load introduction from shear connections to concrete-filled steel tubular (CFST) columns, and the effectiveness of changing different construction details. The results of the tests have confirmed the authors’ recently proposed new load-introduction mechanism, obtained from an extensive numerical study. In the new load-introduction mechanism, the connection load is introduced to the concrete core via the column length above and within the connection or the cap plate on top of the column. There is no limit to the load-introduction length above the connection. Below the connection, there is transfer of forces from the steel tube to the concrete core, but the total force in the column remains unchanged. This load introduction mechanism is different from that assumed in the various current design codes. This study has an important implication for CFST column design: using shear connectors below the connection is ineffective in increasing CFST column strength.
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References
ABAQUS [Computer software]. Dassault Systèmes, Waltham, MA.
AISC (American Institute of Steel Construction). (2010). “Specification for structural steel building.” ANSI-AISC 360-05, Chicago.
CEN (European Comittee for Standardization). (2001). “Metallic materials—Tensile testing. Part 1: Method of test at ambient temperature.”, London.
CEN (European Comittee for Standardization). (2004). “Eurocode 4: Design of composite steel and concrete structures—Part 1-1: General rules and rules for buildings.”, London.
Chan, T. M., and Gardner, L. (2008). “Compressive resistance of hot-rolled elliptical hollow sections.” Eng. Struct., 30(2), 522–532.
Dai, X., and Lam, D. (2010). “Numerical modelling of the axial compressive behaviour of short concrete-filled elliptical steel columns.” J. Constr. Steel Res., 66(7), 931–942.
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.
Dunberry, E., Leblanc, D., and Redwood, R. G. (1985). “Simple beam connections for concrete filled steel tubes.” McGill Univ., Montreal.
Ellobody, E., and Young, B. (2006). “Nonlinear analysis of concrete-filled steel SHS and RHS columns.” Thin-Walled Struct., 44(8), 919–930.
Ellobody, E., Young, B., and Lam, D. (2006). “Behaviour of normal and high strength concrete-filled compact steel tube circular stub columns.” J. Constr. Steel Res., 62(7), 706–715.
Elsawaf, S., Wang, Y. C., and Mandal, P. (2011). “Numerical modelling of restrained structural subassemblies of steel beam and CFT columns connected using reverse channels in fire.” Eng. Struct., 33(4), 1217–1231.
Giakoumelis, G., and Lam, D. (2004). “Axial capacity of circular concrete-filled tube columns.” J. Constr. Steel Res., 60(7), 1049–1068.
Han, L.-H., Liu, W., and Yang, Y.-F. (2008). “Behaviour of concrete-filled steel tubular stub columns subjected to axially local compression.” J. Constr. Steel Res., 64(4), 377–387.
Han, L.-H., and Yao, G.-H. (2003). “Behaviour of concrete-filled hollow structural steel (HSS) columns with pre-load on the steel tubes.” J. Constr. Steel Res., 59(12), 1455–1475.
Hu, H. T., Huang, C. S., Wu, M. H., and Wu, Y. M. (2003). “Nonlinear analysis of axially loaded concrete-filled tube columns with confinement effect.” J. Struct. Eng., 1322–1329.
Hu, H.-T., Huang, C.-S., and Chen, Z.-L. (2005). “Finite element analysis of CFT columns subjected to an axial compressive force and bending moment in combination.” J. Constr. Steel Res., 61(12), 1692–1712.
Huang, C., et al. (2002). “Axial load behavior of stiffened concrete-filled steel columns.” J. Struct. Eng., 1222–1230.
Jacobs, W. P., and Hajjar, J. F. (2010). “Load transfer in composite construction.” Structures Congress 2010, ASCE, Reston, VA, 1229–1240.
Kurobane, Y., Packer, J. A., Wardenier, J., and Yeomens, N. (2004). “Design guide for structural hollow section column connections.” TÜV, Koln, Germany.
Liang, Q. Q., and Fragomeni, S. (2009). “Nonlinear analysis of circular concrete-filled steel tubular short columns under axial loading.” J. Constr. Steel Res., 65(12), 2186–2196.
Macrae, G., Roeder, C., Gunderson, C., and Kimura, Y. (2004). “Brace-beam-column connections for concentrically braced frames with concrete filled tube columns.” J. Struct. Eng., 233–243.
Mollazadeh, M. H., and Wang, Y. C. (2014). “New insights into the mechanism of load introduction into concrete-filled steel tubular column through shear connection.” Eng. Struct., 75, 139–151.
Schneider, S. (1998). “Axially loaded concrete-filled steel tubes.” J. Struct. Eng., 1125–1138.
Varma, A. H., Ricles, J. M., Sause, R., and Lu, L.-W. (2002). “Seismic behavior and modeling of high-strength composite concrete-filled steel tube (CFT) beam-columns.” J. Constr. Steel Res., 58(5–8), 725–758.
Wium, J. A. (1992). “A composite columns: Force transfer from steel section to concrete encasement.” Swiss Federal Institute of Technology, Lausanne, Switzerland.
Yang, H., Lam, D., and Gardner, L. (2008). “Testing and analysis of concrete-filled elliptical hollow sections.” Eng. Struct., 30(12), 3771–3781.
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Published In
Journal of Structural Engineering
Volume 142 • Issue 6 • June 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Jun 29, 2015
Accepted: Nov 3, 2015
Published online: Jan 19, 2016
Published in print: Jun 1, 2016
Discussion open until: Jun 19, 2016
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