Numerical simulation of the effect of column removal on the plastic rotation of beams in reinforced concrete structures

Document Type : Research Article

Authors

Civil engineering department, faculty of construction engineering, university, Mouloud MAMMERI, Tizi-Ouzou, Algeria.

Abstract

In recent years, the progressive component collapse phenomenon in structures have attracted the attention of agencies around the world, structural systems are subject to progressive collapse when they are exposed to excessive loads that exceed the ultimate capacity of the structural elements. The rapid loss of structural components, such as columns, causes failure mechanisms that can result in the total or partial collapse of the structure. Currently, researchers are adopting different modeling techniques to simulate the effect of structural load-bearing elements loss on the overall behavior of structures during a progressive collapse. The objective of this study is to interpret the effect of the deleted column in the reinforced concrete frame structures on the overall behavior. The modeling procedure was implemented following the finite element method. An experimental model was tested to validate the accuracy of the modeling approach using CAST3M, in which the local modeling approach (fiber model) for the cross-sections and the global modeling approach for the elements (beams and columns) were used. The behavior laws are used with the aim of modeling the behavior of the materials using empirical laws during their deformations. Then, the study focused on the study of the plastic hinges development under vertical loading (imposed displacement) in a reinforced concrete frame composed of three stories and four spans. The results show that the occurrence of plastic hinges (damage level) is located on the near-central column nodes. At the edges, minor damage is noted, remaining practically in the elastic stage.

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