CAJ | 학술논문

火灾条件下钢管与混凝土间界面热阻对结构温度场有很大影响。利用INSTRON 8874型高温材料试验机的高温接触热阻试验装置对钢‐混凝土界面接触热阻进行了试验研究，根据各测点的温度时间历程曲线，利用多项式拟和方法外推得到钢、混凝土界面处温度值，通过热传导方程和接触热阻定义得到了界面接触热阻。试验结果表明，不同界面压力下钢管混凝土界面的接触热阻数值比较稳定，与文献结果相比有一定可靠性；无界面压力下钢管混凝土界面的接触热阻数值离散性大，随温度变化明显。
화재조건하강관여혼응토간계면열조대결구온도장유흔대영향。이용INSTRON 8874형고온재료시험궤적고온접촉열조시험장치대강‐혼응토계면접촉열조진행료시험연구，근거각측점적온도시간역정곡선，이용다항식의화방법외추득도강、혼응토계면처온도치，통과열전도방정화접촉열조정의득도료계면접촉열조。시험결과표명，불동계면압력하강관혼응토계면적접촉열조수치비교은정，여문헌결과상비유일정가고성；무계면압력하강관혼응토계면적접촉열조수치리산성대，수온도변화명현。
Under Fire conditions ,the interface thermal resistance between steel and concrete has important influence on structure temperature field .TheINSTRON 8874 material testing machine for high temperature thermal contact resistance testing device was used to conduct the thermal contact resistance experiments of steel and concrete interface .According to the time history curve of each measuring point's temperature ,the interface temperature near steel and near concrete was obtained using the polynomial fitting and extrapolation method .The interface thermal contact resistance was calculated by heat conduction equation and definition of thermal contact resistance . The test results showed that under different interface pressure ,the thermal contact resistance value was constant and comparatively consistent with the literature ;Without interface pressure ,the thermal contact resistance value was unstable and varied obviously with temperature .