EFFECT OF SLENDERNESS ON FIBRE REINFORCED POLYMER WRAPPED REINFORCED CONCRETE COLUMNS

Abstract

The paper presents the results of a study on the performance of Glass Fibre Reinforced Polymer (GFRP) wrapped high strength concrete columns under uni-axial compression. The columns had slenderness ratios of 8, 16, 24 and 32. Three types of wrap materials (Chopped Strand Mat GFRP, Uni-Directional Cloth GFRP and Woven Roving GFRP) were used with 3 mm and 5 mm thicknesses. The columns were tested under monotonic axial compressive loading up to failure. The deflections and axial strain were noted for each load increment. The HSC columns with GFRP wrapping exhibited improved performance in terms of load and deformation capacity. Adaptive Neuro - Fuzzy Inference System (ANFIS) modeling has been proposed for predicting the performance parameters. A better correlation has been observed between the test results and those predicted through the proposed modeling

Keywords

• Deformation, Ductility, GFRP, High Strength Concrete

References

1. [1] Mirmiran, A., Shahawy, M. and Beitleman, T. Slenderness Limit for Hybrid FRP Concrete Columns, ASCE Jl. of Compos. for Constr., 5(1), 26-34.2001.
2. [2] Girard, C. and Bastien, J. Finite Element Bond Slip Model for Concrete Columns under Cyclic Loads, ASCE Jl. of Structural Engg., 128(12), 1502-1510,2002.
3. [3]Aire, C., Gettu, R., Casas, J.R., Marques, S. and Marques, D., (2005), "Compressive Behaviour of Concrete Confined with Fibre Reinforced Polymer Wraps", Proc. Advances in Concrete and Composites, SERC, Chennai, India, pp. 825-832.
4. [4] Challal, O., Shahawy, M. and Hassan, MPerformance of Axially Loaded Short Rectangular Columns Strengthened with Fiber Reinforced Polymer Wrapping, ASCE Jl. of Compos. For Constr., 7(3), 200-208,2003.
5. [5] Hadi, M.N.S. and Li, J. External Reinforcement of High Strength Concrete Columns, Elsevier Jl. of Composite Structures, 65, 279-287,2004.
6. [6] Aire, C., Gettu, R., Casas, J.R., Marques, S. and Marques, D., Compressive Behaviour of Concrete Confined with Fibre Reinforced Polymer Wraps, Proc. Advances in Concrete and Composites, SERC, Chennai, India, pp. 825-832. 2005.
7. [7] Kaminski, M. and Trapko, T, Experimental Behaviour of Reinforced Concrete Column Models Strengthened by CFRP Materials,., Jl. of Civil Engineering and Management, 12(2), 109-115,2006.
8. [8] Saenz, N. and Pantelides, C.P. Strain-Based Confinement Model for FRP-Confined Concrete, ASCE Jl. of Structural Engg., 133(6), 825-833.2007.