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Steel and Composite Structures Volume 20, Number 6, April30 2016 , pages 1305-1322 DOI: https://doi.org/10.12989/scs.2016.20.6.1305 |
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Structural behavior of partially encased composite columns under axial loads |
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Margot F. Pereira, Silvana De Nardin and Ana L.H.C. El Debs
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| Abstract | ||
| This paper presents the results of experimental and numerical model analyses on partially encased composite columns under concentric loads. The main objective of this study is to evaluate the influence of replacing the conventional longitudinal and transverse steel bars by welded wire mesh on the structural behavior of these members under concentric loads. To achieve these goals experimental tests on four specimens of partially encased composite columns submitted to axial loading were performed and the results were promising in terms of replacing the traditional reinforcement by steel meshes. In addition, a numerical FE model was developed using the software DIANA® with FX+. The experimental results were used to validate the numerical model. Satisfactory agreement between experimental and numerical results was observed in both capacity and deformability of the composite columns. Despite of the simplifying assumptions of perfect bond between steel and concrete, the numerical model adequately represented the columns behavior. A finite element parametric study was performed and parameters including thickness of the steel profile and the concrete and steel strengths were evaluated. The parametrical study results found no significant changes in the partially encased columns behavior due to variations of the steel profile thickness or yield strength. However, significant changes in the post peak behavior were observed when using high strength concrete and these results suggest a change in the failure mode. | ||
| Key Words | ||
| partially encased composite column; axial loads; experimental analysis; numerical model; concentric load | ||
| Address | ||
| (1) Margot F. Pereira, Ana L.H.C. El Debs: Department of Structural Engineering, University of Sao Paulo, Sao Carlos, Brazil / Avenida Trabalhador Saocarlense 400, Centro, Sao Carlos-SP - CEP: 13.566-590, Brazil; (2) Silvana De Nardin: Department of Civil Engineering, Federal University of Sao Carlos, Sao Carlos, Brazil / Rodovia Washington Luis, km 235 - SP-310 Sao Carlos-SP - CEP 13565-905, Brazil. | ||