Investigation of bond slip effect on the P-M interaction surface of RC columns under biaxial bending

The nonlinear behavior of reinforced concrete columns subject to biaxial bending and consideration of bond-slip at the steel-concrete interface are investigated. Separate degrees of freedom are used for the steel and concrete parts to allow for the difference in displacement between the reinforcing...

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Bibliographic Details
Published inScientia Iranica. Transaction A, Civil engineering Vol. 22; no. 2; p. 388
Main Authors Hashemi, S Sh, Vaghefi, M
Format Journal Article
LanguageEnglish
Published Tehran Sharif University of Technology 01.04.2015
Subjects
Civil engineering
Reinforced concrete
Structural engineering
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Summary:The nonlinear behavior of reinforced concrete columns subject to biaxial bending and consideration of bond-slip at the steel-concrete interface are investigated. Separate degrees of freedom are used for the steel and concrete parts to allow for the difference in displacement between the reinforcing bars and the surrounding concrete. The effect of bond-slip was investigated, on the numerical bearing capacity of a reinforced concrete column subject to axial and biaxial bending forces. The axial force-bending moment interaction surface of the reinforced concrete column under two conditions (with and without bar slip) is calculated, and compared also with ACI criteria. The results show that although ACI criteria is based on perfect bond assumption, the results are conservative anyway, due to the fact that the beneficial effect of stirrup confinement on concrete compressive strength is neglected, and the use of reduction factor does not make any modification necessary for considering the bond-slip effect on the ultimate capacity of the RC section.