The necessity of modeling the column beam joint panel zone in reinforced concrete structures with behavioral degradation

Document Type : Research Article

Authors

1 Department of Civil Engineering, Faculty of Engineering, Behbahan Khatam Alanbia University of Technology,

2 Engineering Department, Faculty of Civil Engineering, Behbahan Khatam Alanbia University of Technology, Behbahan, Iran

Abstract

The panel zone is the central part of the beam and column joint in the frame. The purpose of this article is to investigate the effect of panel zone modeling on the behavior of concrete moment resistance frames. For this purpose, two 8- and 12-story concrete moment resistance frames are modeled using OpenSees software and the results of nonlinear cyclic static analysis, nonlinear dynamic analysis and nonlinear incremental dynamic analysis, with and without consideration of panel zones are compared to each other. In all cases, the degradation has been considered based on the Ibarra, Medina and Krawinkler model. The results show that the in the static analyses, the differences in the results of the models are very small. In the dynamic analyses, the effect of the panel zone is significant. The fragility curves of the structures indicate that the models with the panel zones reached the collapse threshold at lower intensity levels. Also, in the non-linear time history analysis of the structural response, it was observed that when the structures have linear behavior, the effects of modeling of the panel zones are insignificant, but when the structure enters the non-linear region, the displacements are greater in the presence of the panel zones.

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Amirkabir Journal of Civil Engineering

Articles in Press, Accepted Manuscript
Available Online from 04 July 2024

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