Vol. 8, No. 4, pp. 331-358 (2012)
COMPRESSIVE PERFORMANCES OF THE CONCRETE FILLED
CIRCULAR CFRP-STEEL TUBE (C-CFRP-CFST)
Y. Che 1, Q.L. Wang 2, * and Y.B. Shao 3
1 Ph. D. Student, School of Civil Engineering, Shenyang Jianzhu University, Shenyang, P. R. China; School of Civil Engineering, Dalian University of Technology, Dalian, P. R. China
2 Professor, School of Civil Engineering, Shenyang Jianzhu University, Shenyang, P. R. China
3 Associate Professor, School of Civil Engineering, Yantai University, Yantai, P. R. China
*(Corresponding author: E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.)
Received: 25 July 2011; Revised: 7 December 2011; Accepted: 14 December 2011
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ABSTRACT
This paper presents the results of axial compressive tests of the concrete filled circular CFRP-steel tubular (C-CFRP-CFST) stub columns. The test results showed that the CFRP jackets enhanced the load bearing capacity of the stub columns effectively. Enhancement of the columns’ stiffness due to the CFRP jackets was also observed. Also, the steel tube and the CFRP tube work concurrently before failure. A constitutive relationship suitable for concrete confined by circular CFRP-steel composite tube was proposed, and a finite element model was established by using ABAQUS for analyzing load-deformation relationship of the composite stub columns and it shows that the results predicted check well with that of the test and were on the safe side. Analysis based on ABAQUS indicates that, outer tube of the C-CFRP-CFST stub columns can provide confinement force for concrete core even during initial loading period. Additionally, the initial stress in the steel tube can postpone the mutual reaction between the steel tube and the concrete, while it has a little influence on the peak value of the confinement force; adhesive strength has little effect on compressive performances of the stub columns. Finally, the index and parametric expression of load bearing capacity of the C-CFRP-CFST stub columns were proposed, and the proposed equations can be used to calculate the load bearing capacity reasonably.
KEYWORDS
Circular CFRP-steel tube, In-filled concrete, Stub columns, Compressive performances, Confinement force, Load bearing capacity
REFERENCES
[1] Han, L. H., “Tests on Concrete Filled Steel Tubular Columns with High Slenderness Ratio”, Advances in Structural Engineering, 2000, Vol. 3, No. 4, pp. 337-344.
[2] Tao, Z., Uy, B., Han, L.H. and Wang, Z.B., “Analysis and Design of Concrete-filled Stiffened Thin-walled Steel Tubular Columns under Axial Compression”, Thin-Walled Structures, 2009, Vol. 47, No. 12, pp. 1544-1556.
[3] Georgios, G. and Lam, D., “Axial Capacity of Circular Concrete-filled Tube Columns”, Journal of Constructional Steel Research, 2004, Vol. 60, No. 7, pp. 1049-1068.
[4] Uy, B., “Strength of Short Concrete Filled High Strength Steel Box Columns”, Journal of Constructional Steel Research, 2001, Vol. 57, No. 2, pp. 113-34.
[5] Wang, Y.C. and Restrepo, J.I., “Investigation of Concentrically Loaded Reinforced Columns Confined with Glass Fiber-reinforced Polymer Jackets”, Structure Journal, 2001, Vol. 98, No. 3, pp. 377-385.
[6] Teng, J.G., Chen, J.F., Smith, S.T. and Lam, L., “FRP Strengthened RC Structures”, John Wiley & Sons Ltd., 2002.
[7] Wang, Q.L., Guan, C.W. and Zhao, Y.H., “Theoretical Analysis about Concentrically Compressed Concrete Filled Hollow CFRP-Steel Stub Columns with Circular Cross-section”, Proceeding of the 2nd International Conference on Steel and Composite Structures, Seoul, Korea, 2004, pp. 684-695.
[8] Tao, Z., Han, L. H. and Zhuang, J.P., “Using CFRP to Strengthen Concrete-filled Steel Tubular Columns: Stub Column Tests”, Proceeding of the 4th International Conference on Advances in Steel Structures, Shanghai, China, 2005, Vol. 1, pp. 701-706.
[9] Han, L.H., “Advanced Composite and Mixed Structures-Testing, Theory and Design Approach”, China Science Press, 2009. (in Chinese)
[10] Tao, Z., Han, L.H. and Wang, L.L., “Compressive and Flexural Behaviour of CFRP Repaired Concrete-filled Steel Tubes after Exposure to Fire”, Journal of Constructional Steel Research, 2007, Vol. 63, No. 8, pp. 1116-1126.
[11] Xiao, Y., He, W.H. and Choi, K.K., “Confined Concrete-filled Tubular Columns.” Journal of Structural Engineering, 2005, Vol. 131, No. 3, pp. 488-497.
[12] Choi, K.K. and Xiao, Y., “Analytical Model of Circular CFRP Confined Concrete-filled Steel Tubular Columns under Axial Compression”, Journal of Composites for Construction, 2010, Vol. 14, No. 1, pp. 125-133.
[13] Tao, Z., Han, L.H. and Wang, Z.B., “Experimental Behaviour of Stiffened Concrete-filled Thin-walled Hollow Steel Structural (HSS) Stub Columns”, Journal of Constructional Steel Research, 2005, Vol. 61, No. 7, pp. 962-983.
[14] Yu, T., Wong, Y.L., Teng, J.G., Dong, S.L. and Lam, E.S.S., “Flexural Behavior of Hybrid FRP-concrete-steel Double-skin Tubular Members”, Journal of Composites for Construction, 2006, Vol. 10, No. 5, pp. 443-452.
[15] Han, L.H., Yao, G.H. and Tao, Z., “Performance of Concrete-filled Thin-walled Steel Tubes under Pure Torsion”, Thin Walled Structures, 2007, Vol. 45, No. 1, pp. 24-36.
[16] Wang, Q.L., Zhu, H.F. and Gao, Y.F., “Constitutive Relationship of Concrete Confined by Circular CFRP-steel Composite Tube under Concentrical Load”, Journal of Shenyang Jianzhu University (Natural Science), 2007, Vol. 23, No. 2, pp. 199-203. (in Chinese)
[17] Han, L.H., Liu, W. and Yang, Y.F., “Behaviour of Concrete-filled Steel Tubular Stub Columns Subjected to Axially Local Compression”, Journal of Constructional Steel Research, 2008, Vol. 64, No. 4, pp. 377-387.
[18] Han, L.H., Yao, G.H. and Zhao, X.L., “Tests and Calculations for Hollow Structural Steel (HSS) Stub Columns Filled with Self-consolidating Concrete (SCC)”, Journal of Constructional Steel Research, 2005, Vol. 61, No. 9, pp. 1241-1269.