This paper presents the results obtained from full-scale tests on 14 reinforced concrete columns strengthened with steel angles and strips subjected to axial loads. All the columns were subjected to loading before strengthening. The influence of various factors on the behaviour of the strengthened column was studied. The results of laboratory tests show that the system of steel angles and strips is highly effective for increasing ultimate load in a column and also increases column stiffness and its ultimate strain. Furthermore, analysis of the results of the experiments allows the load transfer mechanisms which affect the behaviour of the strengthened element to be determined.
AdamJ.M. (2007). Structural Behaviour of RC Columns Strengthened by Steel Jacketing, Research Report, Code 1940/66, Technical University of Valencia, Valencia, Spain.
2.
CalderónP.A.GiménezE.AdamJ.M. and IvorraS. (2006). “Full scale testing of RC columns strengthened with steel angles and battens”, Proceedings of the 11th International Conference on Structural Faults and Repair, Edinburgh, Scotland.
3.
CEB-FIB (2003). Seismic Assessment and Retrofit of Reinforced Concrete Buildings, Bulletin No. 24, Task Group 7.1, Laussane, Switzerland.
4.
CirtekL. (2001a). “RC columns strengthened with bandage – experimental programme and design recommendations”, Construction and Building Materials, Vol. 15, No. 8, pp. 341–349.
5.
CirtekL. (2001b). “Mathematical model of RC banded column behaviour”, Construction and Building Materials, Vol. 15, No. 8, pp. 351–359.
6.
HadiM.N.S. and LiJ. (2004). “External reinforcement of high strength concrete columns”, Composite Structures, Vol. 65, No. 3–4, pp. 279–287.
7.
EH-68 (1968). Instrucción Para el Proyecto y la Ejecución de Obras de Hormigón en Masa o Armado, Madrid, Spain (in Spanish).
8.
EHE (1998). Instrucción Para el Proyecto y la Ejecución de Obras de Hormigón en Masa o Armado. Ministerio de Fomento, Madrid, Spain (in Spanish).
9.
ENV, EC-3 (1996). Proyecto de Estructuras de Acero, AENOR, Madrid, Spain (in Spanish).
10.
FernándezM. (1994). Patología y Terapeutica del Hormigón Armado, Ed. Colegio de Ingenieros de Caminos, Canales y Puertos, Madrid, Spain (in Spanish).
11.
FrangouM.PilakoutasK. and DritsosS. (1995). “Structural repair/strengthening of RC columns”, Construction and Building Materials, Vol. 9, No. 5, pp.259–266.
12.
FukuyamaH. and SuganoS. (2000). “Japanese seismic rehabilitation of concrete buildings after the Hyogoken-Nanbu earthquake”, Cement & Concrete Composites, Vol. 22, No.1, pp. 59–79.
13.
GiménezE. (2007). Experimental and Numerical Study of Axially Loaded RC Columns Strengthened by Steel Jacketing, PhD Thesis, Technical University of Valencia, Valencia, Spain.
14.
GiménezE.AdamJ.M.CalderónP.A. and IvorraS. (2006). “Numerical and experimental study of the strengthening of reinforced concrete columns using steel angles and strips”, Proceedings of the Tenth East Asia-Pacific Conference on Structural Engineering & Construction (EASEC-10), Bangkok, Thailand.
15.
OeyH.S. and AldreteC.J. (1996). “Simple method for upgrading an existing reinforced-concrete structure”, Practice Periodical on Structural Design and Construction, Vol. 1, No.1, pp.47–50.
16.
RamírezJ.L. and BárcenaJ.M. (1975). “Eficacia resistente de pilares de Hormigón armado de baja calidad reforzados por dos procedimientos diferentes”, Informes de la Construcción, No. 272, pp.89–98 (in Spanish).
17.
RamírezJ.L.BárcenaJ.M. and FeijooJ.M. (1977). “Comparación resistente de cuatro métodos de refuerzo de pilares de Hormigón armado”, Informes de la Construcción, No. 290, pp. 57–68 (in Spanish).
18.
RamírezJ.L. (1996). “Ten concrete column repair methods”, Construction and Building Materials, Vol. 10, No. 3, pp.195–202.
19.
RamírezJ.L.BárcenaJ.M.UrretaJ.I. and SanchezJ.A. (1997). “Efficiency of short steel jackets for strengthening square section concrete columns”, Construction and Building Materials, Vol. 11, No. 5, pp. 345–352.
20.
RC-03 (2003). Instrucción Para la Recepción de Cementos, Ministerio de Fomento, Madrid, Spain (in Spanish).
21.
RegaladoF. (1999). Los Pilares, Criterios Para su Proyecto Cálculo y Reparación, CYPE Ingenieros, Alicante, Spain (in Spanish].
22.
SamaanM.MirmirianA. and ShahawyM. (1998). “Model of concrete confined by fibre composite”, Journal of Structural Engineering, ASCE, Vol. 124, No. 9, pp. 1025–1031.
23.
TamaiS.SatoT. and OkamotoM. (2000). “Hysteresis model of steel jacketed RC columns for railway viaducts”, Proceedings of the 16th Congress of IABSE, Lucerne, Switzerland.
24.
UyB. (2002). “Strength of reinforced concrete columns bonded with external steel plates”, Magazine of Concrete Research, Vol. 54, No. 1, pp. 61–76.
25.
ValluvanR.CogerM.E. and JirsaJ.O. (1993). “Strengthening of column splices for seismic retrofit of nonductile reinforced concrete frames”, ACI Structural Journal, Vol. 90, No. 4, pp. 432–440.
26.
WuY.F.LiuT. and OehlersD.J. (2006). “Fundamental principles that govern retrofitting of reinforced concrete columns by steel and FRP jacketing”, Advances in Structural Engineering, Vol. 9, No. 4, pp. 507–533.
