中文摘要：

研究了轴向非均匀温度分布对钢梁火灾性能的影响，包括对失效的极限温度、挠度和潜在的危险进行了理论分析和相关计算．研究结果表明：非均匀温度分布对钢梁火灾性能影响很大，以往的单一极限温度失效判据有一定的局限性，导致钢梁失效的平均温度与单一极限温度不尽相同，最大挠度的大小和位置取决于轴向温度分布以及刚度-温度模型．

英文摘要：

The effects of longitudinally non-uniform temperature distribution on steel beams were studied. Theoretical analyses and related calculations were performed on limiting temperature, displacement and potential hazards. Results indicate that the non-uniform temperature distribution affects the performances of the steel beam significantly. Under non-uniform temperature, the average value of the temperatures along the beam which can cause failure of the beam, may be different from the limiting uniform temperature. The values and positions of the maximum values of displacement and hazard coefficient depend greatly on the specific longitudinal temperature distribution, the elastic-temperature and strength capacit-temperature relationship.