Title:
Tension Stiffening and Cracking Behavior of Glass Fiber- Reinforced Polymer-Reinforced Concrete
Author(s):
Zahra Kharal and Shamim Sheikh
Publication:
Structural Journal
Volume:
114
Issue:
2
Appears on pages(s):
299-310
Keywords:
crack spacing; crack width; glass fiber-reinforced polymer bars; reinforced concrete; tension stiffening
DOI:
10.14359/51689420
Date:
3/1/2017
Abstract:
In this study, 60 large-scale specimens—52 glass fiber-reinforced polymer (GFRP) reinforced concrete and eight steel-reinforced concrete—were tested under uniaxial tension to investigate tension stiffening and cracking behavior of GFRP-reinforced normal- and high-strength concretes. The test parameters included bar type, bar diameter, reinforcement ratio, and concrete strength. Tension stiffening was found to be independent of concrete strength, bar diameter, and reinforcement ratio when shrinkage was included in the analysis of the member response. The final stabilized crack spacing was found to decrease with an increase in reinforcement ratio and concrete strength, and a decrease of bar diameter. The current code provisions and guidelines—namely, ACI 440.1R-06 and CEB-FIP Model Code 2010—were found to significantly overestimate tension stiffening in GFRP-reinforced specimens. A new tension stiffening model was therefore developed that provided better simulation of the test data. The CEB-FIP 1978 model for crack spacing was modified for GFRP-reinforced members.
Related References:
Abrishami, H. H., and Mitchell, D., 1996, “Influence of Splitting Cracks on Tension Stiffening,” ACI Structural Journal, V. 93, No. 6, Nov.-Dec., pp. 703-710.
ACI Committee 318, 2011, “Building Code Requirements for Structural Concrete and Commentary (ACI 318-11),” American Concrete Institute, Farmington Hills, MI, pp. 126-128.
ACI Committee 440, 2006, “Guide for the Design and Construction of Structural Concrete Reinforced with FRP Bars (ACI 440.1R-06),” American Concrete Institute, Farmington Hills, MI, pp. 21-23.
ASTM D7205-06, 2006, “Standard Test Method for Tensile Properties of Fiber Reinforced Polymer Matrix,” ASTM International, West Conshohocken, PA, 13 pp.
Bentz, E. C., 2005, “Explaining the Riddle of Tension Stiffening Models for Shear Panel Experiments,” Journal of Structural Engineering, ASCE, V. 131, No. 9, pp. 1422-1425. doi: 10.1061/(ASCE)0733-9445(2005)131:9(1422)
Bischoff, P. H., 2001, “Effects of Shrinkage on Tension Stiffening and Cracking in Reinforced Concrete,” Canadian Journal of Civil Engineering, V. 28, No. 3, pp. 363-374. doi: 10.1139/l00-117
Bischoff, P. H., and Paixao, R., 2004, “Tension Stiffening and Cracking of Concrete Reinforced with Glass Fibre Reinforced Polymer (GFRP) Bars,” Canadian Journal of Civil Engineering, V. 31, No. 4, pp. 579-588. doi: 10.1139/l04-025
Branson, D. E., 1977, Deformation of Concrete Structures, McGraw-Hill Book Co., New York, 546 pp.
Canadian Standards Association, 2012, “Design and Construction of Building Components with Fibre Reinforced Polymers (CSA S806-12 2012),” CSA, Mississauga, ON, Canada, pp. 16-33.
CEB-FIP, 1978, “CEB-FIP Model Code for Concrete Structures (MC78),” third edition, Comité Euro-International du Béton, Paris, France, 348 pp.
CEB-FIP, 1993, “CEB-FIP Model Code (MC-90),” Comité Euro-International du Béton, Lausanne, Switzerland, 437 pp.
CEB-FIP, 2010, “CEB-FIP Model Code,” Comité Euro-International du Béton, Lausanne, Switzerland, 437 pp.
Collins, M. P., and Mitchell, D., 1997, Prestressed Concrete Structures, Response Publications, Toronto and Montreal, Canada, 766 pp.
Deluce, J. R., 2011, “Cracking Behaviour of Steel Fibre Reinforced Concrete Containing Conventional Steel Reinforcement,” MASc thesis, Department of Civil Engineering, University of Toronto, Toronto, ON, Canada, 506 pp.
Deluce, J. R., and Vecchio, F. J., 2013, “Cracking Behaviour of Steel Fiber-Reinforced Concrete Members Containing Conventional Reinforcement,” ACI Structural Journal, V. 110, No. 3, May-June, pp. 481-490.
Gergely, P., and Lutz, L. A., 1968, “Maximum Crack Width in Reinforced Concrete Flexural Members,” Causes, Mechanisms, and Control of Cracking in Concrete, SP-20, American Concrete Institute, Farmington Hills, MI, pp. 87-117.
Getzlaf, D. D., 2012, “An Investigation into the Flexural Behaviour of GFRP Reinforced Concrete Beams,” MASc thesis, Department of Civil Engineering, University of Toronto, Toronto, ON, Canada, 245 pp.
Johnson, D. T., 2014, “Investigation of GFRP Bars as Internal Reinforcement for Concrete Structures,” PhD thesis, Department of Civil Engineering, University of Toronto, Toronto, ON, Canada, 423 pp.
Kharal, Z., 2014, “Tension Stiffening and Cracking Behavior of GFRP Reinforced Concrete,” MASc thesis, Department of Civil Engineering, University of Toronto, Toronto, ON, Canada, 243 pp.
Masukawa, J., 2012, “Degradation of Shear Performance of Beams Due to Bond Deterioration and Longitudinal Bar Cutoffs,” PhD thesis, Department of Civil Engineering, University of Toronto, Toronto, ON, Canada, pp. 75-77.
Sooriyaarachchi, H.; Pilakoutas, K.; and Byars, E., 2005, “Tension Stiffening Behaviour of GFRP Reinforced Concrete,” 7th International Symposium for Fibre-Reinforced Polymer (FRP) Reinforcement for Concrete Structures – FRPRCS7, SP-230, American Concrete Institute, Farmington Hills, MI, pp. 975-989.
Toutanji, H. A., and Saafi, M., 2000, “Flexural Behavior of Concrete Beams Reinforced with Glass Fiber-Reinforced Polymer (GFRP) Bars,” ACI Structural Journal, V. 97, No. 5, Sept.-Oct., pp. 712-719.
Vecchio, F. J., and Collins, M. P., 1986, “The Modified Compression Field Theory for Reinforced Concrete Elements Subject to Shear,” ACI Journal Proceedings, V. 83, No. 2, Mar.-Apr., pp. 219-231.