A reappraisal of the method based on nominal curvature for designing reinforced concrete columns in fire is proposed, with the focus on the validation of an alternative and widely accepted way of applying the method, which differs from the current provisions of EN 1992-1-2. To this end, a systematic comparison between experimental and numerical results is carried out on a database consisting of 74 columns tested in different laboratories. The comparison shows that the method based on nominal curvature yields conservative estimates of the time to failure. Moreover, the numerical results obtained are reasonably close to those obtained by means of finite element analysis. By contrast, if the method is applied in combination with the simplified methods introduced in EN 1992-1-2, the numerical results are not conservative, with a significant overestimation of the bearing capacity of the columns, and of the time to failure, mainly because of the overestimation of the stiffness by the simplified methods.

中文翻译：

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钢筋混凝土柱防火设计中名义曲率法的再评价

建议重新评估基于名义曲率的火灾钢筋混凝土柱设计方法，重点是验证替代且广泛接受的应用该方法的方法，该方法不同于 EN 1992-1-2 的当前规定. 为此，在由不同实验室测试的 74 列组成的数据库上进行了实验和数值结果之间的系统比较。比较表明，基于名义曲率的方法产生了对失效时间的保守估计。此外，获得的数值结果与通过有限元分析获得的结果相当接近。相比之下，如果将该方法与 EN 1992-1-2 中引入的简化方法结合应用，则数值结果并不保守，