Advanced Steel Construction

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

                                                 DOI:10.18057/IJASC.2012.8.4.2

 

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

 

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