In this paper, performance based a fire resistance design method for evaluating the flexural carrying capacity of reinforced concrete (RC) beams has been proposed. The developed method is associated with a simple heat transfer model for RC beams subjected to the unsteady state heat transfer at transient heating boundary condition with three basic heating mechanism, i.e., conduction, convection and radiation. The validity and verification of the fire resistance design method and heat transfer model have been established with the experimentally measured and compiled database. Parametric studies also conducted to investigate the fire-resistance rating of designed RC beams and comparative appraisal of existing codes practices has been examined. Through the results of the fire resistance design method, it reveals that the developed method is capable to predicts fire-resistance rating of RC beams at fire scenarios, nominal cover, type of aggregate and thermal-induced concrete properties.

在本文中，提出了一种基于性能的耐火设计方法，用于评估钢筋混凝土（RC）梁的挠曲承载力。所开发的方法与简单的传热模型相关，该模型在瞬态加热边界条件下具有非稳态传热的RC梁具有三种基本的加热机制，即传导，对流和辐射。通过实验测量和编译数据库，建立了耐火设计方法和传热模型的有效性和验证性。还进行了参数研究，以研究设计的RC梁的耐火等级，并检查了现有规范做法的比较评估。通过耐火设计方法的结果，