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通过分析火灾发生时RC梁截面内温度场的分布,得出了火灾后RC梁的抗力折减系数,建立了火灾后RC梁的抗力计算模型,同时引入了火灾前抗力和荷载效应随时间而变化的动态可靠性,对长期使用后又遭受火灾作用的RC梁可靠性进行了分析,分析过程中考虑了火灾前后两个过程可靠性的相关性。算例分析表明,使用时间和高温作用及两个过程的相关性对梁的可靠性都有一定的影响,在有条件的情况下应给予考虑。
By analyzing the distribution of temperature field in RC beams during fire, the resistance reduction coefficient of RC beams after fire is obtained. The resistance calculation model of RC beams after fire is established. At the same time, the resistance and load effect before fire are introduced, The reliability of the changes, the reliability of RC beams exposed to fire after long-term use is analyzed, and the correlation between the reliability of the two processes before and after the fire is considered in the analysis. The case study shows that the use of time and high temperature and the correlation between the two processes have a certain impact on the reliability of the beam, and should be considered under the condition.