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介绍了火灾下轴压钢柱的破坏准则。利用数值分析的方法,根据不同的破坏准则计算火灾下轴压钢柱的临界温度。火灾下钢材的力学性能分别参照EC3和CECS选取。通过对临界温度计算结果的对比分析,发现:①2个变形准则给出的结果基本相同,但以变形准则为判断依据往往会高估构件的临界温度;②应用变形准则需具备一定条件,即火灾下构件的破坏形式为整体失稳或截面强度破坏,若构件发生局部屈曲,变形准则不适用;③同一破坏准则下,火灾下钢材性能分别按照EC3和CECS选取,临界温度计算结果相差超过200°C。最后,给出临界温度设计曲线的上、下限,以方便工程应用。
Describes the failure criteria of steel columns under fire. Using numerical analysis method, the critical temperature of steel columns under fire is calculated according to different failure criteria. Mechanical properties of steel under fire were selected with reference to EC3 and CECS respectively. Comparing and analyzing the calculation results of the critical temperature, it is found that: ① The results of the two deformation codes are basically the same, but the critical temperature of the member is often overestimated based on the deformation criterion; ② The application of the deformation criterion requires that the fire Under the same failure criterion, the properties of the steel under fire are respectively selected according to EC3 and CECS, and the calculated results of the critical temperature differ by more than 200 ° C. Finally, the upper and lower limits of the critical temperature design curve are given to facilitate the engineering application.