Fire Resistance Evaluation of Reinforced Concrete Columns Using Axial Load Ratio and Slenderness Ratio

Abstract

Since the column members in buildings deal with both vertical and horizontal loads, appropriated amount of load should be estimated in order to evaluate the fire resistance performance of the columns under loaded condition. However, according to the ISO 834, the international standard for the evaluation of structural members, the fire resistance performance evaluation of column members is only based on the displacement and displacement rate under loaded condition in a standard fire. The purpose of this study is to suggest appropriate axial load ratios for the evaluation of fire resistance performance. The test conducted in this study produced appropriate axial load ratios for different slenderness ratios. They are expected to contribute to more accurate estimation of fire resistance performance and more efficient and cost-effective structural design.

A Study on Heat Transfer Analysis and Experiment of Reinforced Concrete Columns Using 500°C Isotherm Method

“…Annex B of EN 1992-1-2, in which fire resistance design method is described, suggests a simple method, which can be easily applied, and use of data by experiments are available for. [1] In particular, cross-sectional loss caused by temperature raise of concrete members exposed to fire was evaluated using strength expected by means of effective cross-section at the target time through heat transfer analysis of members considering thermal properties of materials. Namely, fire-resistant performance of members considering strength deterioration rate as per higher temperature compared to room temperature was evaluated using projection method for fire-resistant performance by 500℃ Isotherm Method in Eurocode.…”