Indexing
All Issues
Submission
Author Guidelines
Reviewers
Editorial Members
Publication Fee
Vol.4 , No. 5, Publication Date: Oct. 13, 2017, Page: 56-64
 columns, strengthened with external carbon fiber reinforced polymer (CFRP) sheets. In this work, we are interested in the effect of the volumetric ratio of the fiber-reinforced polymer (<i>ρ<sub>FRP</sub></i>) on the effectiveness of the CFRP external confinement. A total of 36 specimens were subjected to axial compression. All test specimens were loaded to failure in axial compression. Compressive stress, axial and hoop strains have been recorded to evaluate the stress-strain relationship, ultimate strength and ductility of the specimens. Results clearly demonstrate that for a given confinement level, the increase in cross-sectional dimensions of the columns would result in a decrease in the volumetric ratio of the fiber-reinforced polymer (<i>ρ<sub>FRP</sub></i>), which will result in a decrease in the strength of the externally-confined-concrete columns. On the other hand, composite wrapping can enhance the structural performance of RC columns in terms of both maximum strength and ductility.&picture=http://www.aascit.org/aascit/decorators/img/journal/896.jpg)
| [1] | Habib-Abdelhak Mesbah, Laboratory of Civil Engineering and Mechanical Engineering, National Institute of Applied Sciences of Rennes, University of Rennes 1, France. |
| [2] | Riad Benzaid, Laboratory of Geological Engineering, University of Mohammed Seddik Benyahia, Jijel, Algeria. |
The present study deals with the analysis of experimental results, in terms of load carrying capacity and strains, obtained from tests on reinforced concrete (RC) columns, strengthened with external carbon fiber reinforced polymer (CFRP) sheets. In this work, we are interested in the effect of the volumetric ratio of the fiber-reinforced polymer (ρFRP) on the effectiveness of the CFRP external confinement. A total of 36 specimens were subjected to axial compression. All test specimens were loaded to failure in axial compression. Compressive stress, axial and hoop strains have been recorded to evaluate the stress-strain relationship, ultimate strength and ductility of the specimens. Results clearly demonstrate that for a given confinement level, the increase in cross-sectional dimensions of the columns would result in a decrease in the volumetric ratio of the fiber-reinforced polymer (ρFRP), which will result in a decrease in the strength of the externally-confined-concrete columns. On the other hand, composite wrapping can enhance the structural performance of RC columns in terms of both maximum strength and ductility.
Keywords
CFRP Composites, External Confinement, FRP Volumetric Ratio, RC Column
Reference
| [01] | Saadatmanesh H, Ehsani M. R, Li MW. (1994), “Strength and ductility of concrete columns externally reinforced with composites straps” ACI Structural journal 9 (4): 434-447. |
| [02] | Nanni A, Bradford N. M. (1995), “FRP jacketed concrete under uniaxial compression” Construction and Building Materials 9 (2): 115-124. |
| [03] | Karbhari V. M, Gao Y. (1997), “Composite jacketed concrete under uniaxial compression-verification of simple design equations” ASCE Journal of Materials in Civil Engineering 9 (4): 185-193. |
| [04] | Mirmiran A, Shahawy A, Samaan M, El Echary M, Mastrapa H. J. C, Pico O. (1998), “Effect of column parameters on FRP-confined concrete” ASCE Journal of Composites for Construction 2 (4): 175-185. |
| [05] | Campione G, Miraglia N. (2003), “Strength and strains capacities of concrete compression members reinforced with FRP” Cement and Concrete Composites 25: 31-41. |
| [06] | Berthet J, Ferrier E, Hamelin P. (2005), “Compressive behavior of concrete externally confined by composite jackets- Part A: experimental study” Construction and Building Materials 19 (3): 223-232. |
| [07] | Rochette P, Labossière P. (2000), “Axial testing of rectangular column models confined with Composites” ASCE Journal of Composites for Construction 4 (3): 129-136. |
| [08] | Chaallal O, Hassen M, Shahawy M. (2003), “Confinement model for axially loaded short rectangular columns strengthened with FRP polymer wrapping” ACI Structural Journal 100 (2): 215-221. |
| [09] | Al-Salloum Y. A. (2007), “Influence of edge sharpness on the strength of square concrete columns confined with FRP Composite laminates” Composite Part B 38: 640-650. |
| [10] | Benzaid R, Mesbah H, Chikh N. E. (2010), “FRP-confined concrete cylinders: axial compression experiments and strength model” Journal of Reinforced Plastics and Composites 29 (16): 2469-2488. |
| [11] | Benzaid R, Mesbah H. A. (2013), “Strength model for square concrete columns confined by external CFRP sheets” Structural Engineering and Mechanics 46 (1): 111-135. |
| [12] | Benzaid R, Mesbah H. A. (2014), “The confinement of concrete in compression using CFRP composites- effective design equations” Journal of Civil Engineering and Management 20 (5): 632-648. |
| [13] | Yongchang G, Jianhe X, Zhihong X, Jian Z. (2016) “Experimental study on compressive behavior of damaged normal- and high-strength concrete confined with CFRP laminates, Construction and Building Materials 107: 411-425. |
| [14] | Ouyang L-J, Gao W-Y, Zhen B, Lu Z-D. (2017), “Seismic retrofit of square reinforced concrete columns using basalt and carbon fiber-reinforced polymer sheets: A comparative study” Construction and Building Materials 162: 294-307. |
| [15] | Thériault M, Neale K. W, Claude S. (2004), “Fiber-reinforced polymer-confined circular concrete columns: investigation of size and slenderness effects” ASCE Journal of Composites for Construction 8 (4): 323-331. |
| [16] | Pan J. L, Xu T, Hu Z. J. (2007), “Experimental investigation of load carrying capacity of the slender reinforced concrete columns wrapped with FRP” Construction and Building Materials 21: 1991-1996. |
| [17] | Rahai A, Akbarpour H. (2014), “Experimental investigation on rectangular RC columns strengthened with CFRP composites under axial load and biaxial bending” Composite Structures 108: 538-546. |
| [18] | De Lorenzis L, Tepfers R. (2003), “A comparative study of models on confinement of concrete cylinders with fiber-reinforced polymer composites” ASCE Journal of Composites for Construction 7 (3): 219-237. |
| [19] | Shahawy M, Mirmiran A, Beitelman T. (2000), “Tests and modeling of carbon-wrapped concrete columns” Composites Part B 31 (6): 471-480. |
