Thermomechanical analysis of reinforced concrete columns exposed to fire

Ferreira, Matheus Wanglon; Filho, Luiz Carlos Pinto da Silva; Real, Mauro de Vasconcellos

doi:10.1590/s1983-41952020000400004

Rev. IBRACON Estrut. Mater.

2020

DOI: 10.1590/s1983-41952020000400004

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Thermomechanical analysis of reinforced concrete columns exposed to fire

Matheus Wanglon Ferreira

Luiz Carlos Pinto da Silva Filho

Mauro de Vasconcellos Real

Abstract: A three-dimensional (3D) transient numerical model for thermomechanical analysis developed with Finite Element Method (FEM) using the software ANSYS 19.1 is exposed in this paper. The proposed model aims to predict the structural behavior of reinforced concrete columns in a fire situation since it is known that high temperatures significantly reduce their mechanical resistance. For this, the main factors that govern their structural behavior should be considered. Analyses obtained by the proposed model were va… Show more

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Cited by 2 publications

References 9 publications

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The cyclic load effect on the elasticity and plasticity deformation of high-strength reinforced concrete elements

Bayat,

Chalecki,

Lesniewska

et al. 2024

Archiv.Civ.Mech.Eng

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This article investigates the degradation of stiffness in high and standard-strength concrete due to the influence of repeated loading and considers the non-linear behavior arising from localized or natural defects of concrete. The article also refers to the models from existing literature that evaluate the characteristics of concrete by enhancing its physicochemical properties through the application of natural and synthetic fibers. The impact of the service load, which influences the change in concrete stiffness, is illustrated using the elastic–plastic concrete model. The elastic–plastic model of concrete, combined with experimentally determined data such as elastic and residual deformations, simplifies the analysis of concrete beams or surface elements. This model enables static solutions of inelastic materials based on the classical theory of elasticity. The degradation of element stiffness in this model is described by the local increment of the rotation angle. Based on the model we can assume a constant stiffness along the length of the beam before as well as after exceeding the value of the cracking moment. In the case of cyclic loads, it can be assumed that residual deformations have the greatest influence on the displacement values, which in the calculation model are described by the component of the angle of rotation in the crack, describing permanent displacements.

show abstract

The cyclic load effect on the elasticity and plasticity deformation of high-strength reinforced concrete elements

Bayat,

Chalecki,

Lesniewska

et al. 2024

Archiv.Civ.Mech.Eng

View full text Add to dashboard Cite

show abstract

Thermomechanical Analysis of Steel-to-Timber Connections under Fire and the Material Density Effect

2022

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This work presents a thermomechanical numerical analysis of a steel-to-timber connection with dowels in tension when exposed to fire using ANSYS ® software. Three different wood density materials were considered. The connection is built by a three-dimensional model with a thermomechanical boundary condition. A nominal temperature–time curve, ISO 834, was used to simulate the fire effect. Numerical simulation to determine the field of thermal and mechanical stresses was performed using a combined problem. A temperature field was imposed for a given time instant of fire exposure, calculated through a thermal analysis in a transient regime. This temperature profile was coupled to an incremental tensile load, allowing the determination of the maximum mechanical resistance of the connection. According to this methodology, the load-bearing capacity of the connections in each fire rating will be determined. In addition, the numerical results allow verification of the wood density influence on the mechanical resistance of the connection exposed to fire. In conclusion, the load-bearing capacity decreases with fire exposure and with lower material density. With the proposed methodology, the effect of the wood density on the heat transferred through the connection under fire can be verified, and a thermomechanical complex model is proposed to solve and analyze this type of problem, which is the great motivation in this work. The numerical methodology represents well the thermomechanical behavior of the connection under fire. This procedure can be used, considering other different parameters, to improve the design and allow the study of the connection behavior as an alternative to the experimental tests.

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Thermomechanical analysis of reinforced concrete columns exposed to fire

Cited by 2 publications

References 9 publications

The cyclic load effect on the elasticity and plasticity deformation of high-strength reinforced concrete elements

The cyclic load effect on the elasticity and plasticity deformation of high-strength reinforced concrete elements

Thermomechanical Analysis of Steel-to-Timber Connections under Fire and the Material Density Effect

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