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整体式梁板结构的耐火性能是钢筋混凝土结构抗火性能评估的重要内容,而常规的分离式钢筋混凝土实体模型通常无法满足结构整体耐火计算的需要.在此采用大型通用有限元软件,建立了基于分层壳理论的钢筋混凝土梁板结构耐火分析的热力耦合计算方法,通过和已有的耐火试验进行对比,证明了该方法的有效性.在此基础上,分析了混凝土热膨胀系数、约束条件等对梁板结构耐火性能的影响,结果表明常规的采用单个构件的耐火评估方法并不能真实地反应结构整体的耐火性能,该工作可以为结构整体的耐火评估提供方法.
The fire resistance of monolithic slab structure is an important part of evaluating the fire resistance of reinforced concrete structures, while the conventional solid model of separated reinforced concrete usually can not meet the requirement of overall refractory calculation of the structure. In this paper, large general finite element software Based on the theory of layered shell theory, the thermal coupling calculation method for the fire resistance analysis of reinforced concrete beam structure is compared with the existing fire resistance test to prove the effectiveness of the method. On this basis, the thermal expansion coefficient of concrete, The results show that the conventional refractory evaluation method using a single component does not truly reflect the fire resistance of the structure as a whole. This work can provide a method for fire resistance evaluation of the whole structure.