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在前人对高温下钢筋混凝土材料属性的研究基础上,结合火灾发生、衰减,熄灭的整个过程,用国际标准化组织(ISO834)建议的建筑构件抗火试验曲线来代替火灾的升温过程,结合钢筋混凝土的热工参数在高温下的变化规律,分析钢筋混凝土在火灾作用下的热能传递方式,总结钢筋混凝土在高温下的计算假定。通过结构有限元分析方法,运用ABAQUS热力学有限元分析软件对四面受火的三维混凝土框架柱进行非线性瞬态温度场模拟分析,得出混凝土框架柱在火灾下沿Z轴方向的温度云分布图,对角节点的时间-温度曲线图、等温曲线图,总结温度场规律,确定不同位置的温度值,以便对结构火灾后的安全性能评估与加固提供更科学、更合理的理论依据,对工程实践起到更好的指导作用。
Based on the previous research on the properties of reinforced concrete materials at high temperature, combined with the entire process of fire occurrence, attenuation and extinguishment, the fire resistance curve of building components proposed by the International Organization for Standardization (ISO834) is used instead of the heating process of fire, The variation of thermal parameters of concrete under high temperature is analyzed. The heat transfer mode of reinforced concrete under fire is analyzed. The calculation assumptions of reinforced concrete under high temperature are summarized. Through the finite element analysis method and the ABAQUS thermodynamic finite element analysis software, the nonlinear transient temperature field simulation of three-dimensional fire-affected concrete frame columns was carried out. The temperature distribution of the temperature distribution along the Z-axis of the concrete frame column under fire , Diagonal nodes of the time - temperature curve, isothermal curve, summed up the law of the temperature field to determine the temperature at different locations in order to assess the structural safety and fire safety assessment to provide more scientific and more reasonable theoretical basis for the project Practice plays a better guiding role.