Bond behaviour of substandard splices in RC beams externally confined with CFRP
Source abstract
Abstract
Bond splitting failures of substandard lap-spliced columns have led to collapse of many RC buildings during recent earthquakes in developing countries. The strengthening of lap-spliced regions with CFRP confinement can reduce the seismic vulnerability of such buildings. This paper investigates bond splitting using flexural tests on twelve RC beams with substandard lap splices (25 bar diameters) at midspan. Different confinement configurations (no confinement, internal stirrups or CFRP sheets), concrete covers and bar sizes are examined at the splice region. The results show that light CFRP confinement enhances the splice bond strength by up to 65% compared to unconfined specimens. Predictive equations from the literature are shown to yield a large scatter in results and to overestimate the strain developed in the CFRP confinement. An alternative approach to calculate the confinement strain and the additional bond strength provided by CFRP confinement is proposed and validated.\ud \ud
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Structural Behavior of Reinforced Concrete · Structural Response to Dynamic Loads · Seismic Performance and Analysis
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (46)
Show source-provided references
1. Field investigation on the performance of building structures during the 12 May 2008 Wenchuan earthquake in China10.1016/j.engstruct.2009.02.039 ↗
2. Eberhard MO, Baldridge S, Marshall J, Mooney W, Rix GJ. Mw 7.0 Haiti Earthquake of January 12, 2010: USGS/EERI advance reconnaissance team report. Open-File Report 2010–1048. U.S. Geological Survey, Reston, Virginia; 2010.10.3133/ofr20101048 ↗
3. Performance and damages of reinforced concrete buildings during the October 23 and November 9, 2011 Van, Turkey, earthquakes10.1016/j.soildyn.2013.06.004 ↗
4. 2000
5. Seismic strengthening of circular bridge pier models with fiber composites
6. Seismic retrofitting of rectangular bridge columns with composite straps10.1193/1.1585946 ↗
7. Seismic retrofit of RC columns with continuous carbon fiber jackets10.1061/(ASCE)1090-0268(1997)1:2(52) ↗
8. Seismic retrofit and repair of circular bridge columns with advanced composite materials10.1193/1.1586070 ↗
9. Effect of confinement using fiber-reinforced polymer or fiber-reinforced concrete on seismic performance of gravity load-designed columns
10. Seismic retrofit of lap splices in nonductile square columns using carbon fiber-reinforced jackets
11. Seismic retrofitting of columns with lap spliced smooth bars through FRP or concrete jackets10.1080/13632460601125714 ↗
12. Hysteretic behaviour of bridge columns with FRP-jacketed lap splices designed for moderate ductility enhancement10.1061/(ASCE)1090-0268(2007)11:6(565) ↗
13. Seismic strengthening of bond-critical regions in rectangular reinforced concrete columns using fiber-reinforced polymer wraps
14. Seismic FRP retrofit of bond-critical regions in circular RC columns: validation of proposed design methods
15. Retrofitting of rectangular columns with deficient lap splices10.1061/(ASCE)CC.1943-5614.0000047 ↗
16. Bond strength of lap-spliced bars in concrete confined with composite jackets10.1061/(ASCE)CC.1943-5614.0000078 ↗
17. Seismic repair and strengthening of lap splices in RC columns: carbon fiber-reinforced polymer versus steel confinement10.1061/(ASCE)CC.1943-5614.0000213 ↗
18. Use of carbon fiber-reinforced polymer anchors to repair and strengthen lap splices of reinforced concrete columns
19. CNR-DT 200 R1/2012 Istruzioni per la Progettazione, l’Esecuzione ed il Controllo di Interventi di Consolidamento Statico mediante l’utilizzo di Compositi Fibrorinforzati - Materiali, strutture di c.a. e di c.a.p., strutture murarie. Consiglio Nazionale delle Ricerche, Roma, Italia; 2012.
20. BS EN 1998–3 Eurocode 8 – Design of structures for earthquake resistance Part 3: assessment and retrofitting of buildings. London, UK: British Standards Institution; 2005.
21. Behaviour of bond-critical regions wrapped with fiber-reinforced polymer sheets in normal and high-strength concrete10.1061/(ASCE)1090-0268(2004)8:3(248) ↗
22. Effect of confinement on bond strength between steel bars and concrete
23. Garcia R, Helal Y, Pilakoutas K, Guadagnini M. Bond strength of short splices in RC beams confined with steel stirrups or external CFRP. Mater Struc 2013, http://dx.doi.org/10.1617/s11527-013-0183-5.10.1617/s11527-013-0183-5 ↗
24. Seismic behaviour of deficient RC frames strengthened with CFRP composites10.1016/j.engstruct.2010.05.026 ↗
25. Garcia R, Jemaa Y, Helal Y, Pilakoutas K, Guadagnini M. FRP strengthening of seismically deficient full-scale RC beam-column joints. In: Proc 15th World Conf Earthq Eng. Lisbon, Portugal; 2012.
26. Garcia R, Helal Y, Pilakoutas K, Guadagnini M, Jemaa Y, Hajirasouliha I, Mongabure P. Seismic strengthening of deficient RC buildings using post-tensioned metal straps: an experimental investigation. In: Proc 15th World Conf Earthq Eng. Lisbon, Portugal; 2012.10.1007/978-3-319-00458-7_11 ↗
27. Kyriakides N. Vulnerability of RC buildings and risk assessment for Cyprus. PhD Thesis. The University of Sheffield, Sheffield, UK; 2007.
28. Ahmed S. Seismic vulnerability of non-ductile reinforced concrete structures in developing countries. PhD Thesis. The University of Sheffield, Sheffield, UK; 2011.
29. ACI 408R–03 – Bond and development of straight reinforcing bars in tension. ACI Committee 408, American Concrete Institute, Farmington Hills, Mich.; 2003.
30. BS EN 12390–3:2009 – Testing hardened concrete Part 3: compressive strength of test specimens. London, UK: British Standards Institution; 2009a.
31. BS EN 12390–6:2009 – Testing hardened concrete Part 6: tensile splitting strength of test specimens. London, UK: British Standards Institution; 2009c.
32. BS EN 12390–5:2009 – Testing hardened concrete Part 5: flexural strength of test specimens. London, UK: British Standards Institution; 2009b.
33. BS EN 1992–1-1 – Eurocode 2: design of concrete structures part 1–1: general rules and rules for buildings. London, UK: British Standards Institution; 2004.
34. BS 4449:2005 – Steel for the reinforcement of concrete-Weldable reinforcing steel-Bar, coil and decoiled product-Specification. British Standards Institution, London, UK; 2005.
35. Deflection behaviour of FRP reinforced concrete beams and slabs: an experimental investigation10.1016/j.compositesb.2012.03.007 ↗
36. Duranovic N, Pilakoutas K, Waldron P. Tests on concrete beams reinforced with glass fibre reinforced plastic bars. In: Proc 3rd Int Symp Non-Metal (FRP) Reinf Concr Struct. Sapporo, Japan; 1997.
37. Steel-concrete bond after concrete splitting: test results10.1007/BF02472693 ↗
38. Shima H, Chou L-L, Okamura H. Micro and macro models for bonding reinforced concrete. Journal of the Faculty of Engineering, vol. 39, No. 2. The University of Tokyo (B); 1987.10.2208/jscej.1987.378_165 ↗
39. fib Bulletin 10 – Bond of reinforcement in concrete. Laussane, Switzerland: International Federation for Structural Concrete; 2000.
40. Engström B, Magnusson J, Huang Z. Pull-out bond behaviour of ribbed bars in normal and high-strength concrete with various confinements. In: Leon R, ed. Bond and development of reinforcement: a tribute to Dr. Peter Gergely. ACI Special, Publication 180; 1998.
41. Lettow S, Eligehausen R. Formulation of application rules for lap splices in the new Model Code. fib Task Group 4.5 “Bond models”. Stuttgart, Germany; 2006.
42. fib Bulletin 55 – Model Code vol. 1. First complete draft. Laussane, Switzerland: International Federation for Structural Concrete; 2010.
43. Reevaluation of test data on development length and splices
44. Splice strength of conventional and high relative rib area bars in normal and high-strength concrete
45. Tepfers R. A theory of bond applied to overlapped tensile reinforcement splices for deformed bars. Publication No. 73:2. Div Concr Struct. Goteborg, Sweden: Chalmers University of Technology; 1973.
46. ACI 440.2R-08 Guide for the design and construction of externally bonded FRP systems for strengthening concrete structures. ACI Committee 440, American Concrete Institute, Farmington Hills, Mich.; 2008.