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从材料性能的角度分析 ,不同材料对钢筋混凝土结构构件的影响机理与影响程度是不同的 .钢材的影响主要与力学性能有关 ;混凝土的影响既与力学性能有关 ,也与热工性能有关 ;不可燃的面层主要与热工性能有关 ,而可燃面层可以加大火灾的危险性 .不可燃面层是一层阻隔层 ,火灾时可以阻止热量向混凝土内部传播 ,因此混凝土构件火灾时的安全可靠性可以得到改善和提高 .对于可以燃烧的装饰层而言 ,则会产生热荷载 ,结构构件在火灾时的损伤或破坏会加重 .本文利用欧洲规范采用的火灾时室内的温度 时间曲线、高温作用下混凝土和钢筋的本构关系 ,以及钢筋混凝土结构非线性分析方法 ,研究和分析了火灾时钢筋混凝土构件截面的温度分布和承载能力 ,并根据分析计算结果讨论了影响混凝土结构火灾安全性的因素
From the point of view of material properties, the influence mechanism and influence degree of different materials on reinforced concrete structural members are different.The influence of steel is mainly related to mechanical properties; the influence of concrete is not only related to the mechanical properties but also to the thermal performance; Combustible surface is mainly related to thermal performance, and combustible surface layer can increase the risk of fire.Non-combustible surface layer is a barrier layer, the fire can prevent the heat spread to the interior of concrete, so the safety of concrete components in case of fire Reliability can be improved and improved.For the burning decorative layer, it will have a heat load, the structural components in the fire damage or damage will be aggravated.In this paper, the use of the European norms of the indoor fire temperature time curve, high temperature The constitutive relation between concrete and steel bar and the nonlinear analysis method of the reinforced concrete structure are researched and analyzed. The temperature distribution and carrying capacity of the section of the reinforced concrete member in fire are studied and analyzed. The fire safety of the concrete structure is discussed based on the analysis and calculation results factor