Influence of Slenderness on Behavior of High-Strength Concrete-Filled FRP Tubes under Axial Compression

Abstract:

This paper presents an experimental investigation on the influence of specimen slenderness on axial compressive behavior of concrete-filled fiber reinforced polymer (FRP) tubes (CFFTs). A total of 18 aramid FRP- (AFRP) confined high-strength concrete (HSC) specimens with circular cross-sections were tested. Specimens with height-to-diameter ratios of 1, 2, 3 and 5 were manufactured and tested, with all specimens maintaining a nominal diameter of 150 mm. The results indicate that specimens with an H/D of 1 exhibit significantly higher strength and strain enhancements compared to specimens with H/D ratios of 2 to 5. The influence of slenderness on specimens with H/D ratios between 2 and 5 was found to be significant in regards to axial strain enhancement, with a decrease observed as specimen slenderness increased. On the other hand, the influence of slenderness on axial strength enhancement of specimens with H/D ratios between 2 and 5 was found to be negligible.

• Periodical: Applied Mechanics and Materials (Volumes 501-504)
• Pages: 963-968
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.501-504.963
• Online since: January 2014
• Authors: Thomas Vincent, Togay Ozbakkaloglu*
• Keywords: Columns, Concrete, Concrete-Filled FRP Tube (CFFT), Confinement, Fiber Reinforced Polymer (FRP), High-Strength Concrete (HSC), Slenderness, Stress-Strain Relationship

References

[1] Ozbakkaloglu, T., Lim, J. C., and Vincent, T. (2013). FRP-confined concrete in circular sections: Review and assessment of the stress-strain models,. Eng. Struct., 49: 1068-1088.

DOI: 10.1016/j.engstruct.2012.06.010

[2] Ozbakkaloglu, T. (2013). Compressive behavior of concrete-filled FRP tube columns: Assessment of critical column parameters,. Eng. Struct., 51: 151-161.

DOI: 10.1016/j.engstruct.2013.01.017

[3] Ozbakkaloglu, T. (2013). Concrete-filled FRP Tubes: Manufacture and Testing of New Forms Designed for Improved Performance., J. Compos. for Constr., ASCE, 17(2): 280 -291.

DOI: 10.1061/(asce)cc.1943-5614.0000334

[4] Ozbakkaloglu, T. (2013). Axial Compressive Behavior of Square and Rectangular High-Strength Concrete-Filled FRP Tubes., J. Compos. for Constr., ASCE, 17(1), 151-161.

DOI: 10.1061/(asce)cc.1943-5614.0000321

[5] Ozbakkaloglu, T. (2013). Behavior of Square and Rectangular Ultra High-Strength Concrete-Filled FRP Tubes under Axial Compression., Composites Part B. 54: 97-111.

DOI: 10.1016/j.compositesb.2013.05.007

[6] Ozbakkaloglu, T., and Vincent, T. (2013). Axial compressive behavior of circular high-strength concrete-filled FRP tubes,. ASCE, J. Compos. Constr., 10. 1061/(ASCE)CC. 1943-5614. 0000410.

DOI: 10.1061/(asce)cc.1943-5614.0000410

[7] Vincent, T., and Ozbakkaloglu, T. (2013). Influence of fiber orientation and specimen end condition on axial compressive behavior of FRP-confined concrete., Construction and Building Materials. 47: 814-826.

DOI: 10.1016/j.conbuildmat.2013.05.085

[8] Ozbakkaloglu, T., and Oehlers, D. J. (2008). Concrete-filled Square and Rectangular FRP Tubes under Axial Compression., J. Compos. for Constr., ASCE, Vol. 12, No. 4, pp.469-477.

DOI: 10.1061/(asce)1090-0268(2008)12:4(469)

[9] Ozbakkaloglu, T., and Oehlers, D. J. (2008). Manufacture and Testing of a Novel FRP Tube Confinement System., Engineering Structures, Vol. 30, No. 9, pp.2448-2459.

DOI: 10.1016/j.engstruct.2008.01.014

[10] Idris, Y., and Ozbakkaloglu, T. (2013). Seismic behavior of high-strength concrete-filled FRP tube columns., J. Compos. for Constr., ASCE. 10. 1061/(ASCE)CC. 1943-5614. 0000388.

DOI: 10.1061/(asce)cc.1943-5614.0000388

[11] Ozbakkaloglu, T., and Akin, E. (2012). Behavior of FRP-Confined Normal- and High-Strength Concrete under Cyclic Axial Compression., J. Compos. for Constr., ASCE, 16(4), 451-463.

DOI: 10.1061/(asce)cc.1943-5614.0000273

[12] Vincent, T., and Ozbakkaloglu, T. (2013). Influence of concrete strength and confinement method on axial compressive behavior of FRP-confined high- and ultra high-strength concrete,. Composites Part B, 50: 413-428.

DOI: 10.1016/j.compositesb.2013.02.017

[13] Ozbakkaloglu, T., and Saatcioglu, M. (2007). Seismic Performance of Square High-Strength Concrete Columns in FRP Stay-in-Place Formwork., Journal of Structural Engineering, ASCE, Vol. 133, No. 1, pp.44-56.

DOI: 10.1061/(asce)0733-9445(2007)133:1(44)

[14] Ozbakkaloglu, T., and Saatcioglu, M. (2006). Seismic Behavior of High-Strength Concrete Columns Confined by Fiber Reinforced Polymer Tubes., J. Compos. for Constr., ASCE, Vol. 10, No. 6, pp.538-549.

DOI: 10.1061/(asce)1090-0268(2006)10:6(538)

[15] Lim, J. C., and Ozbakkaloglu, T. (2013). Confinement model for FRP-confined high-strength concrete., J. Compos. for Constr., ASCE. 10. 1061/(ASCE)CC. 1943-5614. 0000376.

DOI: 10.1061/(asce)cc.1943-5614.0000376

[16] Ozbakkaloglu, T., and Lim, J. C. (2013). Axial Compressive Behavior of FRP-Confined Concrete: Experimental Test Database and a New Design-Oriented Model., Composites Part B. 55: 607-634.

DOI: 10.1016/j.compositesb.2013.07.025

[17] Hadi, M.N.S., and Li, J. (2004). External reinforcement of high strength concrete columns,. J. Compos. Struct., 65: 279 - 287.

DOI: 10.1016/j.compstruct.2003.11.003

[18] Yazici, V., and Hadi, M. (2009). Behaviour of FRP Wrapped Circular Concrete Columns,. in Proc. 9th Int. Symp. On Fiber Reinforced Polymer Reinforcement for Concrete Structures. Sydney, Australia: Univ. of Adelaide.

DOI: 10.1201/9780203859926.ch33

[19] Rousakis, T., and Tepfers, R. (2001).