Prediction of Compressive Behavior of FRP-Confined Concrete Based on the Three-Dimensional Constitutive Laws

- Journal title : Journal of the Korea Concrete Institute
- Volume 16, Issue 4, 2004, pp.501-509
- Publisher : Korea Concrete Institute
- DOI : 10.4334/JKCI.2004.16.4.501

Title & Authors

Prediction of Compressive Behavior of FRP-Confined Concrete Based on the Three-Dimensional Constitutive Laws

Cho Chang-Geun; Kwon Min-ho;

Cho Chang-Geun; Kwon Min-ho;

Abstract

The proposed model can predict the compressive behaviors of concrete confined with fiber reinforced polymer (FRP) jacket. To model confining concrete by FRP jackets, the hypoelasticity-based constitutive law of concrete In tri-axial stress states has been presented. The increment of strength of concrete has been determined by the failure surface of concrete in tri-axial states, and its corresponding peak strain is computed by the strain enhancement factor that is proposed in the present study, Therefore, the newly proposed model is a load-dependent confinement model of concrete wrapped by FRP jackets to compare the previous models which are load-independent confinement models. The behavior of FRP jackets has been modeled using the mechanics of orthotropic laminated composite materials in two-dimension. The developed model is implemented into the incremental analysis of compressive tests. The verification study with several different experiments shows that the model is able to adequately capture the behavior of the compression test by including better estimations of the axial responses as well as the lateral response of FRP-confined concrete cylinders.

Keywords

FRP-confined concrete;compressive behavior;multi-axial constitutive law;laminated composite;

Language

Korean

Cited by

References

1.

Cho, C.G. and Park, M.H, 'Finite Element Prediction of the Influence of Confmement on RC Beamcolumns under Single or IXmble Curvature Bending,' Engineering Structures, Vol.25, 2003, pp.1525~1536

2.

Cho, C.G. and Hotta, H, 'A Study on Compressive Strength of Concrete in F1exural Regions of Reinforced Concrete Beams Using Finite Element Analysis,' Structural Engineering and. Mechanics, An International Journal, Vo1.13, No.3, 2002, pp.313~328

3.

Pantazopoulou, S. J. and Mills, R. H., 'Microstructural aspects of the mechanical response of plain concrete, ACI Material Journal, Vol.92, 1995, pp.605-616

4.

Spoelstra, M. R. and Monti, G., 'FRP-confined concrete model,' Journal of Composites for Construdion, ASCE, 1999, No.3, pp.143~150

5.

Saadatmanesh, H., Ehsani, M. R. and Li, M. W., 'Strength and Ductility of Concrete Columns Externally Reinforced with Fiber Composite Straps,' ACI Strudural. Journal, Vo1.91, No.4, 1994, pp.434~447

6.

Hosotani, M., Kawashima, K., and Hoshikuma, J., 'A Stress-Strain Model for Concrete Cylinders Confined by Carbon Fiber Sheets,' Journal of Materials, Concrete Structures, and. Pavement, JSCE, Vo1.39, No. 592, 1993, pp.37~52

7.

Mander, J.B., Priestley, M.J.N, and Park, R, 'Theoretical stress-strain model for confined concrete,' J. Structural Engineering, ASCE, Vol. 114, No.8, 1988, pp.1804~1826

8.

조창근 외 3인, '다축응력상태의 구성관계에 기초한 FRP 콘크리트 부재의 층분할 단면해석모델', 한국콘크리트학회 논문집, 14권, 6호, 2002, pp.892~899

9.

Darwin, D. and Pecknold, D.A., 'Nonlinear biaxial law for concrete,' J. Eng. Mech Div., ASCE, Vol. 103(EM2), 1977, pp.229~241

10.

Saenz, L. P., 'Discussion of equation for the stressstrain curve of concrete by Desayi and Krishman,' Journal of ACI, Vol.61, No.9, 1964, pp.1229~1235

11.

Hsieh, S. S., Ting, E. C., and Chen, W. F., 'An elastic-fracture model for concrete,' ASCE Proc 3d Eng. Mech Div. Spec Conf, 1979, pp.437~440

12.

Selby, R. G., 'Three-climensional constitutive relations for reinforced concrete,' PhD Thesis, University of Toronto, Canada, Toronto, 1993

13.

Minniran, A., and Shahawy, M., 'Behavior of Concrete Columns Confined by Fiber Composites, J. Structural Engineering, ASCE, Vol.123, No.5, 1997, pp.583~590

14.

Picher, F., Rochette, P., and Labossiere, P., 'Confmement of concrete cylinders with CFRP,' Proc, 1st Int. Conf. on Composites in Infrastructure, H. Saadatmanesh and M. R. Ehsani, eds., University of Arizona, Tucsan, Arizona, 1996, pp.829~841

15.

Kawashima, K., Hosotani, M., and Hoshikuma, J., 'A model for confinement effect for concrete cylinders confined by carbon fiber sheets,' NCEER-NlCEDE Workshop on Earthquake Engineering Frontiers in Transportation Facilities, NCEER State University of New York, Buffalo, N. Y., 1997

16.

Elwi, A. A. and Murray, D. W., 'A 3D hypoelastic concrete constitutive relationship,' Eng. Mech Div, ASCE, Vol.105(EM4), 1979, 623~641

17.

Fam, A. Z. and Rizkalla, S. H., 'Confinement model for axially loaded concrete confined by circular fiber-reinforced polymer tubes,' ACI Structural Journal, Vol.98, No.4, 2001, pp.451~461

18.

Nanni, A. and Bradford, N. M., 'FRP jacketed concrete under uniaxial compression,' Construction and Building Materials, 1995, No.2, pp.115~124