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Experimental investigation and numerical simulation of post-peak behavior and size effect of reinforced concrete columns

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Abstract

This paper deals with the effect of structural size of reinforced concrete columns with square cross sections on their nominal strength and post-peak behavior. This topic was studied experimentally on three different sizes of geometrically similar specimens. Our attention was focused on the overall performance of columns, in particular: peak strength, post-peak branch, type of a failure, concrete softening and steel buckling. Computational model based on the microplane model M4 for concrete [1,2] was used to simulate experimental results. As the result of experiments, no significant size effect was found in the nominal strength. However, size effect was found in the post-peak behavior. Results of the computer simulation showed good agreement with experimental data and proved the capabilities of the used material model.

Résumé

L'effet de la taille structurale des colonnes en béton armé avec une section carrée sur leur résistance nominale et le comportement après-pic est étudié dans l'article. Cet effet a été étudié à l'aide d'une expérience sur trois échantillons de tailles différentes mais de géométrie ressemblante. L'attention est concentrée sur le comportement global des colonnes et en particulier sur la résistance en pic, la partie de la courbe après-pic, le type de rupture, le ramollissement du béton et le flambement de l'acier. Le modèle numérique basé sur le modèle microplane M4 pour le béton [1, 2] a été utilisé pour la modélisation de l'expérience. Les résultats expérimentaux ont montré qu'aucun effet significatif de l'échelle de taille sur la résistance nominale n'a été trouvé. Cependant, il existe un effet de l'échelle sur le comportement après-pic. Les résultats numériques sont en bon accord avec les données expérimentales et l'utilisation du modèle a été justifiée.

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Authors and Affiliations

  1. Department of Structural Mechanics, Faculty of Civil Engineering, Czech Technical University in Prague, Czech Republic

    J. Němeček & Z. Bittnar

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  1. J. Němeček
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  2. Z. Bittnar
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Editorial Note Prof. Zdeněk Bittnar is a RILEM Senior Member.

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Němeček, J., Bittnar, Z. Experimental investigation and numerical simulation of post-peak behavior and size effect of reinforced concrete columns. Mat. Struct. 37, 161–169 (2004). https://doi.org/10.1007/BF02481615

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  • DOI: https://doi.org/10.1007/BF02481615

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