The Behavior of Reinforced Concrete Frames Exposed to High Temperatures under Cyclic Load Effect


Hüsem M., Çolakoğlu H. E., Akbulut Y. E., Yılmaz Y.

3rd International Civil Engineering & Architecture Conference (ICEARC'23), Trabzon, Turkey, 12 - 14 October 2023, vol.1, pp.1817-1824

  • Publication Type: Conference Paper / Full Text
  • Volume: 1
  • Doi Number: 10.31462/icearc.2023.sme973
  • City: Trabzon
  • Country: Turkey
  • Page Numbers: pp.1817-1824
  • Karadeniz Technical University Affiliated: Yes

Abstract

Purpose: This study aims to examine the behavior of reinforced concrete frames exposed to high temperatures due to fire under the effect of cyclic loads such as earthquakes. Study design/methodology/approach: Within the scope of the study, 13 reinforced concrete frame test elements with the same concrete and steel material properties and dimensions were produced. All of the reinforced concrete frame test elements reached the target temperature within 1 hour and were exposed to high-temperature effects at these target temperatures for 60, 120, and 180 minutes. The test elements, which were exposed to the high-temperature effect, were left to cool on their own, and when they reached room temperature, they were removed from the furnace and a repeated horizontal loading effect was applied. 

Findings: The horizontal load-carrying capacities of the test elements exposed to the high-temperature effect for 60, 120, and 180 minutes, respectively, decreased by 24%, 33.33%, and 36% in thrust, at most 25.76%, 37.6%, and 38.72% in tension. When compared to the reference test element, the energy consumption of the test elements exposed to the high-temperature effect for 60, 120, and 180 minutes decreased by a maximum of 30.98%, 42.41%, and 39.62%, respectively. The initial stiffness of all test elements exposed to the effect of high temperature decreased compared to the initial stiffness of the reference test element. 

Originality/value: This study shows that in the event of an earthquake that may occur, reinforced concrete structures exposed to high temperatures due to fire experience very important losses in vital parameters such as horizontal load, displacement, stiffness, and energy absorption capacity of the structure.