Structural Engineering and Mechanics

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Flexural response of steel beams strengthened by fibre-reinforced plastic plate and fire retardant coating at elevated temperatures

  • Ahmed, Alim Al Ayub (Jiujiang University) ;
  • Kharnoob, Majid M. (Civil Engineering Department, University of Baghdad) ;
  • Akhmadeev, Ravil (Plekhanov Russian University of Economics, Russian Federation) ;
  • Sevbitov, Andrei (Department of Propaedeutics of Dental Diseases, Sechenov First Moscow State Medical University) ;
  • Jalil, Abduladheem Turki (Medical Laboratories Techniques Department, Al-Mustaqbal University College) ;
  • Kadhim, Mustafa M. (Medical Laboratory Techniques Department, Al-Farahidi University) ;
  • Hansh, Zahra J. (College of Petroleum Engineering, Al-Ayen University) ;
  • Mustafa, Yasser Fakri (Department of Pharmaceutical Chemistry, College of Pharmacy, University of Mosul) ;
  • Akhmadullina, Irina (Kazan Federal University)
  • Received : 2021.11.06
  • Accepted : 2022.07.04
  • Published : 2022.08.25
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Abstract

In this paper, the effect of fire conditions according to ISO 834 standard on the behavior of carbon fibre-reinforced plastic (CFRP) reinforced steel beams coated with gypsum-based mortar has been investigated numerically. To study the efficiency of these beams, 3D coupled temperature-displacement finite element analyzes have been conducted. Mechanical and thermal characteristics of three different parts of composite beams, i.e., steel, CFRP plate, and fireproof coating, were considered as a function of temperature. The interaction between steel and CFRP plate has been simulated employing the adhesion model. The effect of temperature, CFRP plate reinforcement, and the fireproof coating thickness on the deformation of the beams have been analyzed. The results showed that within the first 120 min of fire exposure, increasing the thickness of the fireproof coating from 1 mm to 10 mm reduced the maximum temperature of the outer surface of the steel beam from 380℃ to 270℃. This increase in the thickness of the fireproof layer decreased the rate of growth in the temperature of the steel beam by approximately 30%. Besides excellent thermal resistance and gypsum-based mortar, the studied fireproof coating method could provide better fire resistance for steel structures and thus can be applied to building materials.

Keywords

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