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Revista IBRACON de Estruturas e Materiais

On-line version ISSN 1983-4195

Rev. IBRACON Estrut. Mater. vol.3 no.3 São Paulo Sept. 2010

http://dx.doi.org/10.1590/S1983-41952010000300002 

Experimental analysis of reinforced concrete columns strengthened with Self-Compacting concrete

 

Análise experimental de pilares de concreto armado reforçados usando concreto Auto-Adensávele

 

 

M. Y. M. OmarI; R. B. GomesII; A. P. A. ReisIII

ISchool of Civil Engineering, Federal University of Goias, mohaomar@gmail.com, Goiânia, Brazil
IISchool of Civil Engineering, Federal University of Goias, rbggomes@gmail.com, Praça Universitária, s/nº - Setor Universitário - CEP 74605-220, Goiânia, Brazil
School of Civil Engineering, Federal University of Goias, andrea.liserre@gmail.com, Praça Universitária, s/nº - Setor Universitário - CEP 74605-220, Goiânia, Brazil

 

 


ABSTRACT

This paper presents the results of reinforced concrete columns strengthened by addition of a self-compacting concrete overlay at the compressed and at the tensioned face of the member, with and without addition of longitudinal steel bars. Eight columns were submit- ted to loading with an initial eccentricity of 60 mm. These columns had 120 mm x 250 mm of rectangular cross section, 2000 mm in length and four longitudinal reinforcement steel bars with 10 mm in diameter. Reference columns P1 and P2 were tested to failure without any type of rehabilitation. Columns P3 to P8 were loaded to a predefined load (close to the initial yield point of tension reinforce- ment), then unloaded and strengthened for a subsequent test until failure. Results showed that the method of rehabilitation used was effective, increasing the loading capacity of the strengthened pieces by 2 to 5 times the ultimate load of the reference column.

Keywords: column; reinforced concrete; strengthening; eccentricity; self-compacting concrete.


RESUMO

Este artigo apresenta os resultados de pilares de concreto armado reforçados por meio da adição de camadas de concreto auto- adensável, tanto na face tracionada quanto na face comprimida, com ou sem adição de barras de aço longitudinais. Oito pilares foram submetidos a um carregamento com excentricidade inicial de 60mm. Estes pilares possuíam seção transversal retangular de 120 mm x 250 mm, comprimento de 2000 mm, e armadura longitudinal constituída por quatro barras de 10 mm de diâmetro. Os pilares de refer- ência, P1 e P2, foram ensaiados até a ruptura sem nenhum tipo de reabilitação. Os pilares P3 à P8 foram inicialmente submetidos a um pré-carregamento que provocava na armadura longitudinal, tensões próximas a do escoamento do aço. Em seguida, estas peças foram descarregadas e reforçadas. Após o concreto do reforço atingir resistência adequada, estes pilares foram ensaiados até a ruptura. Os resultados mostraram que o método de reforço estudado foi eficiente, pois dependendo da face do pilar em que se aplicava a camada de reforço, as peças reabilitadas apresentaram uma capacidade de carga de 2 a 5 vezes maior que a dos pilares não reforçados.

Palavras-chave: pilar; concreto armado; reforço; excentricidade; concreto auto-adensável.


 

 

Texto completo disponível apenas em PDF.

Full text avaliable only in PDF.

 

 

6. References

[01]   CLIMACO, J. C. T.. Repair of structural concrete involving the addition of new concrete. Ph.D. Thesis, Polythecnic of Central London, London, UK. 285p, 1990.         [ Links ]

[02]   AÏTCIN, P. C., High-Performance Concrete. London, U. K., Editora E & FN SPON, 1st Edition, 1998, 591 p.         [ Links ]

[03]   EL Debs, M. K. Precast Concret: Fundamentals and Applications. Department of Structural Engineering, São Carlos Engineering School, São Paulo University, EESC-USP. 456p, 2000, São Paulo, Brazil.         [ Links ]

[04]   ABU-TAIR, A. I.; RIGDEN, S. R.; LAVERY, D.; NADJAI, A. e AHMED, T. M. A. A new method for evaluating the surface roughness of concrete cut for repair or strengthening. Construction and Building Materials, 14, p. 171-176, 2000.         [ Links ]

[05]   ADORNO, A. L. C. Theoretical and experimental analysis of concrete columns and reinforced concrete columns under eccentric load. Ph.D. thesis, Department of Civil and Environmental Engineering, University of Brasilia, Brasilia, DF, Brazil, 399p, 2004. (In Portuguese).         [ Links ]

[06]   ARAÚJO, L. M. B. Theoretical and experimental analysis of reinforced concrete columns subjected to axial load and flexure. M.Sc. thesis, Federal University of Goias, Goiânia, Brazil. 196p, 2004. (In Portuguese).         [ Links ]

[07]   OMAR, M. Y. M. Experimental analysis of reinforced concrete columns strengthened with self-compacting concrete. M.Sc. thesis, Federal University of Goias, Goiânia, Brazil. 266p, 2006. (In Portuguese).         [ Links ]

[08]   ACI COMMITTEE 318. Building Code Requirements for Reinforced Concrete and Commentary - ACI 318M/02. Detroit, American Concrete Institute, 2001.         [ Links ]

 

 

Received: 14 Sep 2009
Accepted: 16 Apr 2010
Available Online: 10 Sep 2010

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