JOURNAL BROWSE
Search
Advanced SearchSearch Tips
Slender RC columns strengthened with combined CFRP and steel jacket under axial load
facebook(new window)  Pirnt(new window) E-mail(new window) Excel Download
 Title & Authors
Slender RC columns strengthened with combined CFRP and steel jacket under axial load
Lu, Yi-yan; Li, Na; Li, Shan; Ou, Tian-yan;
 Abstract
This paper presents an experimental study on the effectiveness of simultaneous application of carbon fiber-reinforced polymer (CFRP) and steel jacket in strengthening slender reinforced concrete (RC) column. The columns were 200 mm square cross section with lengths ranging from 1600 to 3000 mm. Ten columns were tested under axial load. The effects of the strengthening technique, slenderness ratio, cross-section area of steel angle and CFRP layer number were examined in terms of axial load-axial strain curve, CFRP strain, steel strip strain and steel angle strain. The experiments indicate that strengthening RC columns with combined CFRP and steel jacket is effective in enhancing the load capacity, ductility and energy dissipation capacity of RC column. Based on the existing models for RC columns strengthened with CFRP and with steel jacket, a design formula considering a slenderness reduction factor is proposed to predict the load capacity of the RC columns strengthened with combined CFRP and steel jacket. The predictions agree well with the experimental results.
 Keywords
reinforced concrete column;strengthening;steel jacket;CFRP;axial load;load capacity;
 Language
English
 Cited by
 References
1.
ACI 440.2R-02 (2002), Guide for the design and construction of externally bonded FRP systems for strengthening concrete structures, Farmington Hills, MI, USA.

2.
Badalament, V., Campione, G. and Mangiavillano, M.L. (2010), "Simplified model for compressive behavior of concrete columns strengthened by steel angles and strips", J. Eng. Mech., 136(2), 230-238. crossref(new window)

3.
Bai, Y.L., Dai, J.G. and Teng, J.G. (2014), "Cyclic compressive behavior of concrete confined with large rupture strain FRP composites", J. Compos. Constr., 18(1), 04013025. DOI: 10.1061/(ASCE)CC.1943-5614.0000386 crossref(new window)

4.
Campione, G. (2012a), "Load carrying capacity of RC compressed columns strengthened with steel angles and strips", Eng. Struct., 40, 457-465. crossref(new window)

5.
Campione, G. (2012b), "Strength and ductility of R.C. columns strengthened with steel angles and battens", Constr. Build. Mater., 35, 800-807. crossref(new window)

6.
Campione, G., Colajanni, P. and La, M.L. (2007), "Ductility of reinforced concrete members externally wrapped with fiber-reinforced polymer sheets", J. Compos. Constr., 11(3), 279-290. crossref(new window)

7.
Cirtek, L. (2001), "RC columns strengthened with bandage - experimental programme and design recommendations", Constr. Build. Mater., 15(8), 341-349. crossref(new window)

8.
Dai, J.G., Bai, Y.L. and Teng, J.G. (2011), "Behavior and Modeling of Concrete Confined with FRP Composites of Large Deformability", J. Compos. Constr., 15(6), 963-973. crossref(new window)

9.
El-Hacha, R. and Mashrik, M.A. (2012), "Effect of SFRP confinement on circular and square concrete columns" Eng. Struct., 36, 379-393. crossref(new window)

10.
El-Hacha, R. and Abdelrahman, K. (2013), "Slenderness effect of circular concrete specimens confined with SFRP sheets", Compos. Part B- Eng., 44(1), 152-166. crossref(new window)

11.
Eurocode 3 (1993), Design of steel structures. Part 1-1: General rules and rules for buildings, Brussels, Belgium.

12.
Eurocode 4 (2004), Design of composite steel and concrete structures. Part 1-1: General rules and rules for buildings, Brussels, Belgium.

13.
Eurocode 8 (2003), Design of structures for earthquake resistance. Part 3: Strengthening and repair of buildings, Brussels, Belgium.

14.
Gajdosova, K. and Bilcik, J. (2013), "Full-Scale Testing of CFRP-Strengthened Slender Reinforced Concrete Columns", J. Compos. Constr., 17(2), 239-248. crossref(new window)

15.
Gimenez, E., Adam, J.M., Ivorra, S. and Calderon, P.A. (2009), "Influence of strips configuration on the behaviour of axially loaded RC columns strengthened by steel angles and strips", Mater. Design, 30(10), 4103-4111. crossref(new window)

16.
Harrie, K.A. and Carey, S.A. (2003), "Shape and "gap" effects on the behavior of variably confined concrete", Cement Concrete Res., 33(6), 881-890. crossref(new window)

17.
Ilki, A., Peker, O. and Karamuk, E. (2008), "FRP retrofit of low and medium strength circular and rectangular reinforced concrete columns", J. Mater. Civil Eng., 20(2), 169-188. crossref(new window)

18.
Li, J.B., Gong, J.X. and Wang, L.C. (2009), "Seismic behavior of corrosion-damaged reinforced concrete columns strengthened using combined carbon fiber-reinforced polymer and steel jacket", Constr. Build. Mater., 23(7), 2653-2663. crossref(new window)

19.
Lu, Y.Y., Shi, J.Y. and Zhao, G.F. (2003), "Experimental research on concrete columns strengthened with the combination of CFRP and angle steel", J. Build. Struct., 24(5), 18-23.

20.
Lu, Y.Y., Chen, S.X. and Zhao, G.F. (2005), "An experimental study on the seismic behavior of reinforced concrete columns strengthened with bonded steel hoops and carbon fiber reinforced polymer sheet", China Civ. Eng. J., 38(8), 10-17.

21.
Lu, Y.Y., Tong, G.B. and Zhang, H.J. (2006), "Experimental research on RC eccentric compression column strengthened with the combination of CFRP and angle steel", J. Build. Struct., 27(1), 106-111.

22.
Lu, Y.Y., Zhang, H. and Zhang, H.J. (2007), "Experimental study on the shear behavior of reinforced concrete columns strengthened with bonded steel angles combining with carbon fiber reinforced polymer sheets", China Civ. Eng. J., 40(10), 1-7.

23.
Maaddawy, T.E., Sayed, M.E. and Abdel-Magid, B. (2010), "The effects of cross-sectional shape and loading condition on performance of reinforced concrete members confined with Carbon Fiber-Reinforced Polymers", Mater. Design, 31(5), 2330-2341. crossref(new window)

24.
Montuori, R. and Piluso, V. (2009), "Reinforced concrete columns strengthened with angles and battens subjected to eccentric load", Eng. Struct., 31(2), 539-550. crossref(new window)