This paper presents validation and evaluation of usefulness of three non-advanced methods in EN 1992-1-2 used to determine the load-bearing capacity of columns under fire conditions: the method A, the isotherm 500 °C method, and the zone method. To verify the usefulness of these methods, experimental results for columns tested in the fire laboratories in Ottawa, Braunschweig, Liege and Ghent were used. The FDM was used to calculate the cross-section temperature distribution being required in the 500 °C isotherm method and the zone method. Temperature dependent material parameters of concrete and steel were adopted according to Eurocode 2. In the case of lack of information in the standards, the authors’ own assumptions were proposed and described. The calculated fire resistance times were compared with the experimental results. The method A has proved to be accurate enough and safe for the cases fulfilling its limitations. The results obtained with the 500 °C isotherm method vary significantly from the experimental results. The zone method is the most complex of these three methods and provides the results more accurate and safer than those obtained with the 500 °C isotherm method. The zone method is recommended for verification of the load-bearing capacity of reinforced concrete columns under fire conditions.

本文介绍了 EN 1992-1-2 中用于确定柱在火灾条件下承载能力的三种非高级方法的有效性的验证和评估：方法 A、等温线 500 °C 方法和区域方法. 为了验证这些方法的有效性，我们使用了在渥太华、布伦瑞克、列日和根特的消防实验室中测试的色谱柱的实验结果。FDM 用于计算 500 °C 等温线法和区域法所需的横截面温度分布。根据欧洲规范 2 采用了混凝土和钢的温度相关材料参数。在标准中缺乏信息的情况下，作者提出并描述了自己的假设。计算出的耐火时间与实验结果进行了比较。对于满足其局限性的案例，方法 A 已被证明足够准确和安全。使用 500 °C 等温线方法获得的结果与实验结果有很大差异。区域法是这三种方法中最复杂的一种，其结果比 500 °C 等温线法获得的结果更准确、更安全。区域法推荐用于验证钢筋混凝土柱在火灾条件下的承载能力。