Sensitivity Study of Reinforced Concrete Beam Exposed to High Temperature: Finite Element Model
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Date
2021-07
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Addis Ababa University
Abstract
Reinforced concrete structures significantly weakened their strength as a result of the fire. The behavior of concrete and RC-reinforced concrete elements at high temperatures has been extensively studied experimentally and analytically. This research paper, "Sensitivity Study of Reinforced Concrete Beam Exposed to High Temperature: A Finite Element Model", analyzed using the commercial software ABAQUS, refers to a three-dimensional (3D) nonlinear transient thermo-mechanical element (FE) analysis.
The purpose of this research is to find out the effect of fire on concrete cover, the compressive strength of concrete, the intensity of the fire, and the duration of the fire, as well as the load arising from the fracture, to understand the effects of fire.
Methodologically Numerical model simulation was employed with the aid of ABAQUS Software, which operated based on a finite element algorithm. The models were developed to analyze and understand the behavior of concrete and reinforced concrete beams with different intensities of fire, concrete cohesion, and compressive strength under different conditions.
The analysis result showed that when the temperature is from 200 °C to 700 °C (OC is a degree Celsius), the failure load decreases while the temperature increases. On the other hand, the concrete cover increased from 15mm to 25 mm, significantly increasing the failure load.
Generally, the results obtained from the nonlinear analyses of reinforced concrete beams under high-temperature duration and intensity are more sensitive compared to compressive strength and concrete cover. In addition, compared with the numerical and experimental solutions available in the literature, they were highly satisfactory.
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Keywords
Reinforced Concrete Beam, Concrete Cover, Compressive Strength, Fire Intensity Fire Duration, Sensitive Parameter, and Failure Load