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国内外现行规范有关钢筋混凝土柱抗火设计的相关规定,几乎都是基于单个构件的研究结果而制定的,由于火灾中相邻构件之间的相互约束,使得约束柱与无约束柱的火灾行为存在本质区别。利用有限元软件SAFIR,本文首先分析了无约束钢筋混凝土柱对应ASTME119标准升温曲线的力学性能,并与其他学者的试验结果进行了对比。随后,针对约束柱耐火极限的不同定义,分析了转动/轴向约束程度对柱耐火极限的影响规律。
At present, the relevant regulations of fire resistance design of reinforced concrete columns at home and abroad are almost always based on the research results of individual components. Due to the mutual restraint between adjacent components in the fire, the fire behaviors of the restraint columns and unrestrained columns There are essential differences. Using finite element software SAFIR, this paper first analyzes the mechanical properties of unconstrained reinforced concrete columns corresponding to ASTME119 standard temperature rise curve, and compares with other scholars’ experimental results. Then, according to the different definitions of the fire resistance limit of the restraint column, the influence law of the rotation / axial restraint degree on the column fire resistance was analyzed.