Skip to main content
SpringerLink
Log in

RC columns externally strengthened with RC jackets

  • Original Article
  • Published:
Materials and Structures Aims and scope Submit manuscript

Abstract

In this paper the behaviour in compression of RC columns externally strengthened with concrete jacketing is analysed and a cross-section analysis of the jacketed member under axial load and bending moment is developed. The focus was to study the effect of confinement of concrete jacket on concrete core and the behaviour of compressed bars with buckling effects. Some other important aspects such as shrinkage, creep, old to new concrete surfaces and bond split effects were not included in the model because: the use of thick non-shrink grout jacket and a well-roughened surface of old-to-new concrete was supposed; long term effects were included though corrective coefficients for monolithic behaviour proposed in the literature. A preliminary validation of the model adopted was made referring to the short-term experimental data available in the literature on the compressive behaviour of RC columns strengthened with concrete jacketing. Good agreement was obtained with the available data in terms of moment-axial force domains and moment–curvature diagrams. The analysis showed the effectiveness of this reinforcing technique in improving both the strength and the ductility of RC cross-sections of columns, highlighting the importance of an accurate choice of strengthened materials (concrete grade, thickness of jacket, space and diameter of stirrups, etc.).

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Fig. 1
Fig. 2
Fig. 3
Fig. 4
Fig. 5
Fig. 6
Fig. 7
Fig. 8
Fig. 9
Fig. 10
Fig. 11
Fig. 12
Fig. 13

Similar content being viewed by others

Abbreviations

a sc :

Stiffness of the internal stirrup

a sj :

Stiffness of the external stirrup

b :

Side of square cross-section

B :

Side of the external jacket

c c :

Concrete cover in the core

c j :

Concrete cover in the jacket

d :

Thickness of the external jacket

d bc :

Diameter of longitudinal bar in the core

d bj :

Diameter of longitudinal bar in the jacket

e :

Eccentricity of the axial load with respect to the column axis

E c :

Elastic modulus of concrete

E h :

Hardening modulus of steel

E r :

Reduced modulus of steel proposed by Papia and Russo for buckling effects

E s :

Elastic modulus of steel

E sec :

Secant modulus of concrete

f c0 :

Compressive strength of unconfined concrete

f cc :

Compressive strength of confined concrete

f cj :

Compressive strength of concrete in the jacket

f ct :

Tensile strength of concrete

f l :

Maximum equivalent confinement pressure

f lc :

Confinement pressure due to the core reinforcement

f lj :

Confinement pressure due to the external jacket

f y :

Yield stress

f yc :

Yield stress of longitudinal bar in the core

f yj :

Yield stress of longitudinal bar in the jacket

f ysc :

Yield stress of stirrups in the core

f ysj :

Yield stress of stirrups in the jacket

k :

Stirrup stiffness for unit length

k pc :

In-plane effectiveness coefficient of confinement pressure induced by internal stirrups

k vc :

In-elevation effectiveness coefficient of confinement pressure induced by internal stirrups

k ej :

In-plane effectiveness coefficient of confinement pressure induced by external stirrups

k vj :

In-elevation effectiveness coefficient of confinement pressure induced by external stirrups

M :

Bending moment in the column

N :

Axial load in the column

s j :

Pitch of the stirrups in the jacket

s c :

Pitch of stirrups in the core

ε :

Axial strain

ε c0 :

Axial strain corresponding to the peak stress in unconfined concrete

ε cc :

Axial strain corresponding to the peak stress in confined concrete

ε y :

Yield strain

ϕ sc :

Diameter of stirrups in the core

ϕ sj :

Diameter of stirrups in the jacket

σ c :

Compressive stress in the concrete

ω st :

Mechanical ratio of the transverse stirrups

References

  1. Altun F (2004) An experimental study of the jacketed reinforced-concrete beams under bending. Constr Build Mater 18:611–618

    Article  Google Scholar 

  2. Badalamenti V, Campione G, Mangiavillano ML (2010) Simplified model for compressive behavior of concrete columns strengthened by steel angles and strips. ASCE J Eng Mech 136(2):230–238

    Article  Google Scholar 

  3. Branco F, Julio ES, Silva VD (2003) Structural rehabilitation of columns with reinforced concrete jacketing. Prog Struct Eng Mater 5:29–37

    Article  Google Scholar 

  4. Branco F, Julio ES, Silva VD (2004) Concrete-to-concrete bond strength. Influence of the roughness of the substrate surface. Constr Build Mater 18:675–681

    Article  Google Scholar 

  5. Branco F, Julio ES, Silva VD (2008) Reinforced concrete jacketing—interface influence on cyclic loading response. ACI Struct J 105(4):471–477

    Google Scholar 

  6. Campione G (2011) Compressive behaviour of short fibrous reinforced concrete members with square cross-section. Struct Eng Mech 37(6):649–669

    Article  Google Scholar 

  7. Computers and Structures (2010) SAP2000: integrated software for structural analysis and design CSI, version 14, Berkeley

  8. Dhakal RP, Maekawa K (2002) Modelling of post-yield buckling of reinforcement. ASCE J Struct Eng 128(9):1139–1147

    Article  Google Scholar 

  9. Ersoy R, Tugrul TA, Suleiman U (1993) Behavior of jacketed columns. ACI Struct J 90:3

    Google Scholar 

  10. Eurocode 2 (2004) Design of concrete structures: part 1-1: general rules and rules for Buildings, EN 1992-1-1

  11. Julio ES, Branco E, De Silva V (2001) Structural rehabilitation of columns with reinforced concrete jacketing. Repair Rehabil 5:29–37

    Google Scholar 

  12. Julio ENBS, Branco FAB, Silva VD (2004) Influence of the roughness of the substrate surface. Constr Build Mater 18:675–681

    Article  Google Scholar 

  13. Julio ENBS, Branco FAB, Silva VD (2005) Reinforcing concrete jacketing-interface influence on monotonic loading response. ACI Struct J 102(2):252–257

    Google Scholar 

  14. Lampropoulos A, Dritos S (2010) Concrete shrinkage effect on columns strengthened with concrete jackets. Struct Eng Int 3:234–239

    Google Scholar 

  15. Lampropoulos A, Dritos S (2011) Modelling of RC columns strengthened with RC jackets. Earthq Eng Struct Dyn 40:1689–1705

    Article  Google Scholar 

  16. Mander JB, Priestley MJN, Park R (1988) Theoretical stress-strain model for confined concrete. ASCE J Struct Eng 114(8):1804–1826

    Article  Google Scholar 

  17. Papia M, Russo G (1989) Compressive strain at buckling of longitudinal reinforcement. ASCE J Struct Eng 115(2):382–397

    Article  Google Scholar 

  18. Penelis GG, Kappos AJ (1997) Earthquake resistant concrete structures. E&FN Spon, London, p 572

    Google Scholar 

  19. Russo G, Terenzani L (2006) Non linear buckling model for the longitudinal reinforcement in RC columns. In: studies and research, graduate school in concrete structures, vol. 22. Fratelli Pesenti, Politecnico di Milano, Milan, pp 227–303

  20. Sfakianakis MG (2002) Biaxial bending with axial force of reinforced composites, repaired concrete sections of arbitrary shape by fiber model and computer graphics. Adv Eng Softw 33:227–242

    Article  MATH  Google Scholar 

  21. Takeuti AR, Bento de Hanai JB, Mirmiran A (2008) Preloaded RC columns strengthened with high-strength concrete jackets under uniaxial compression. Mater Struct 41:1251–1262

    Article  Google Scholar 

  22. Thermon GE, Pantazopoulon SJ, Elnashai AS (2007) Flexural behavior of brittle RC members rehabilitated with concrete jacketing. ASCE Struct J 133(1):1373–1384

    Article  Google Scholar 

  23. Vandoros KG, Dritos SE (2006) Axial preloading effects when reinforced concrete columns are strengthened by concrete jackets. Repair Rehabil 8:79–92

    Google Scholar 

  24. Vandoros KG, Dritos SE (2008) Concrete jackets construction details effectiveness when strengthening RC columns. Constr Build Mater 22:264–276

    Article  Google Scholar 

Download references

Acknowledgments

This work has benefited from material deriving from the 2010–2013 Research Project ReLUIS (Rete dei Laboratori di Ingegneria Sismica), AT 1, Task 1.1.2: Strutture in Cemento Armato ordinarie e prefabbricate.

Author information

Authors and Affiliations

  1. DICAM, University of Palermo, Viale delle Scienze, 90128, Palermo, Italy

    G. Campione

  2. Facoltà di Ingegneria e Architettura, University of Enna “Kore”, Cittadella Universitaria, 94100, Enna, Italy

    M. Fossetti, C. Giacchino & G. Minafò

Authors
  1. G. Campione
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. M. Fossetti
    View author publications

    You can also search for this author in PubMed Google Scholar

  3. C. Giacchino
    View author publications

    You can also search for this author in PubMed Google Scholar

  4. G. Minafò
    View author publications

    You can also search for this author in PubMed Google Scholar

Corresponding author

Correspondence to G. Campione.

Rights and permissions

Reprints and permissions

About this article

Cite this article

Campione, G., Fossetti, M., Giacchino, C. et al. RC columns externally strengthened with RC jackets. Mater Struct 47, 1715–1728 (2014). https://doi.org/10.1617/s11527-013-0146-x

Download citation

  • Received:

  • Accepted:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1617/s11527-013-0146-x

Keywords

Search

Navigation