P-M interaction curve for reinforced concrete columns exposed to elevated temperature

Abstract

Structural performance of a reinforced concrete (RC) column is greatly influenced by its slenderness ratio. Especially, under the elevated temperature, secondary moment can be additionally induced by the loss of cross-section. In this study, therefore, the axial force-flexural moment (P-M) interaction model of a RC column exposed to fire was proposed, which considers the slenderness effect due to fire damage. The 500 °C isotherm method presented in Eurocode2 was adopted to consider the fire damage, and the nonlinearity of materials was also reflected. In addition, in order to consider initial imperfection, the maximum axial strength was limited by Rankine load. The proposed P-M interaction model was verified with test results collected from existing studies. The results showed that the proposed model evaluated the fire-resisting performance of the specimens very accurately.

Interaction diagrams and failure criteria for RC columns subjected to high temperature

“…In the literature, a few number of studies have been involved in creating M – N interaction diagrams for RC columns subjected to elevated temperatures (Meda et al , 2002; Bamonte et al , 2008; Law and Gillie, 2010; El-Fitiany and Youssef, 2014; Kang et al , 2016; Lee et al , 2016).…”

“…Kang et al (2016) proposed a model to conduct the axial force–bending moment N u – M u interaction diagrams of RC columns exposed to elevated temperatures. Their model, which account for the slenderness effect because of fire damage, adopted the 500°C isotherm method presented in Eurocode 2 (2004).…”

“…Based on the same lines and assumptions of Kang et al (2016) model, Lee et al (2016) developed a simplified model to construct the N u – M u interaction curves for reinforced concrete columns exposed to fire to be used for practical design. They represented the interaction curves by only three points and two straight lines.…”

Estimation of Heating Temperature for Fire-Damaged Concrete Structures Using Adaptive Neuro-Fuzzy Inference System

“…Concrete is a composite material made from a mixture of cement, aggregate, and water. When exposed to high temperatures, concrete expands in ways that depend on the thermal properties of each component, which may result in concrete cracks and spalling [4,5,6,7]. This phenomenon, in turn, drastically decreases the compressive and tensile strengths and durability of concrete.…”

Analysis of the Effect of Fire on Plant Facilities Through Real Fire Test

“…강재 및 콘크리트와 같은 구조재료는 고온에 노출될 경우 상온상태의 재료강도가 감소되는 경향을 나타내며 (9)(10)(11)(12) 다양한 , 연구자 및 코드에서 노출온도에 따른 재료의 강도저감률을 제 안하고 있다 이 연구에서는 강재의 경우 . Poh (13) 의 모델을 사용 하였으며 콘크리트의 경우 , EC2 (14) 모델을 사용하였다.…”