高温下钢管自密实混凝土界面接触热阻试验研究

钢管混凝土结构的火灾性能研究通常要考虑钢管和混凝土的界面接触热阻问题,本文对钢管自密实混凝土柱的界面接触热阻进行了试验研究。制作了8个钢管自密实混凝土柱,依据Fourier定律和Newton冷却定律得到了钢管混凝土界面接触热阻的求解方法。利用有限元和多项式拟合外推得到界面温度,得出钢管混凝土接触热阻随着钢管界面温度的变化规律。试验结果表明,未受载的钢管自密实混凝土界面接触热阻平均值范围在0.002~0.01m2·K/W,与其他文献结果相比有一定可靠性。

Experimental Study of Thermal Contact Resistance on the Interface between Steel Tube and Self-Compacting Concrete at High Temperature

Interface thermal contact resistance between steel and concrete is usually has to be considered when the interface fire behavior of steel tube and concrete structure is studied.Experimental study of thermal contact resistance of self-compacting concrete filled steel tube (SCCFST) was carried out,its results are presented in this paper.Eight self-compacting concrete filled steel tube columns were prepared for experiment.According to Fourier's law and Newton's cooling law,the solution method for thermal contact resistance of steel tube and concrete interface was constructed.By using finite element method and polynomial fitting,the interface temperature was obtained through extrapolation.The variation of steel-concrete thermal contact resistance with the steel tube interface temperature was also obtained.Experimental results show that the average value of thermal contact resistance of unloaded SCCFST is in a range from 0.002 to 0.01m2 · K/W,compared with other literature,which has a certain reliability degree.