Finite Element Modeling of Reinforced Concrete Column after Exposure to Fire

Abstract

Reinforced Concrete is the most essential composition for construction which is a great combination to building structures in any desired form. Previously, the behavior of concrete during and after fire has often been taken for granted considering it as a non-combustible material. Although RC is non-combustible, steel bars and concrete degrade in strength during and after exposure to fire; “high temperatures”. In the present research, non-linear Finite Element Modeling (FEM) was employed to build a 3D model of RC column with 150×150×1000 mm³ dimensions in Abaqus. The column was analyzed after exposure to fire (EuroCode ISO834) under several values of axial loads.The aim of this study is to provide a 3D FE model to measure the vertical displacement and stress distribution across the RC column after exposure to fire considering the influence of load and heat rise. To ensure the accuracy of simulation, the obtained displacement data were validated and compared to experimental and theoretical results (Finite Element Modeling(FEM)) results available in the literature.The simulation indicated that the stress distribution varies after fire emphasizing the higher stress on the surface of the column. Moreover, the vertical displacement was increased after exposure to fire.