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前期试验表明,表面设置厚度20 mm的某非膨胀型防火涂料可较好地抑制高强混凝土的高温爆裂。本文通过试验反算给出了该涂料对应不同温度区间的平均导温系数;随后,利用结构抗火分析软件SAFIR对表面设置该涂料的高强混凝土柱的耐火极限进行了计算分析,考察了截面尺寸、轴压比、荷栽偏心率及配筋率等因素的影响,在此基础上提出了相应的高强混凝土柱耐火极限实用计算公式。研究结果表明:①该涂料的平均导温系数随温度升高有所降低;②表面设置厚度20 mm的该涂料可明显提高高强混凝土柱的耐火极限,提高幅度达40%～350%。
The preliminary tests show that a non-intumescent fire retardant coating with a surface thickness of 20 mm can effectively suppress the high temperature burst of high-strength concrete. In this paper, the average temperature transfer coefficient of the coating corresponding to different temperature ranges is given through the test. Then, the fire resistance of the high strength concrete columns with the coating on the surface is calculated and analyzed by SAFIR. , Axial compression ratio, loading eccentricity and reinforcement ratio and other factors, based on which the corresponding practical formulas for calculating the fire resistance of high strength concrete columns are proposed. The results show that: (1) the average thermal conductivity of the coating decreases with increasing temperature; (2) the coating with the thickness of 20 mm on the surface can obviously improve the fire resistance of high strength concrete columns by 40% ~ 350%.