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Study Simultaneous Heat and Moisture Transfer in Concrete Slab under Fire Resistance Test.

研究耐火试验下混凝土板的同时热量和水分传递。

基本信息

批准号：
61850107
负责人：
TERAI Toshio
金额：
$ 4.35万
依托单位：
Kyoto University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research
财政年份：
1986
资助国家：
日本
起止时间：
1986 至 1987
项目状态：
已结题

项目摘要

The factors affecting the result of fire resistance test are identified. The experimental data are collected and analyzed, and found the specimen which is strong is highly fire resistant and shows typical temperature creeping and also good correlation to factors identified, but the weaker shows less fire resistance and poor correlation. In ordr to see the effect of factors fire, resistance test for the real scale specimens are carried. Main findings are as follows if the heating are carried under the equal temperature-time integral, the higher sbsolute temperature cause the higher rear surface temperature, the bottom cover plate is vavorable to reduce rear temperature, JIS method which use cedar plate to press thermocouples cause higher temperature than ISO method, the test under lower initial temperature is favorable than under higher temperature, the higher water content brings longer creeping time and also lower temperature, the specimens made of martar, light weight concrete and normal concrete shows lower rear temperature in this order. The numerical calculations by using diffusion model are carried and showed good agreement to the experiments, diagonally implicit Runge-Kutta method is used to get stable and fast computation. The calculation says the correction for the temperature under probable test conditions should be in the following order, thermal conductivity, furnace temperature, water content, method of thermocouple setting, initial air temperature and cooling process.

确定了影响耐火试验结果的因素。通过对试验数据的收集和分析，发现强度高的试件耐火性强，表现出典型的温度蠕变，与所识别的因素相关性好;强度低的试件耐火性差，相关性差。为了解各因素对耐火性能的影响，进行了真实的缩尺试件的耐火性能试验。主要研究结果如下：在等温时积分下进行加热时，物体温度越高，背面温度越高，底部盖板对降低背面温度的作用越大，JIS法采用杉木板压接热电偶的方法比ISO法的温度高，较低初始温度下的试验比较高温度下的试验有利。含水量越高，蠕变时间越长，温度越低，砂浆、轻骨料混凝土和普通混凝土试件的后部温度依次降低。采用扩散模型进行了数值计算，计算结果与实验结果吻合较好，采用对角隐式Runge-Kutta方法进行了稳定快速的计算。计算表明，在可能的试验条件下，温度的校正应按以下顺序进行：热导率、炉温、含水量、热电偶设置方法、初始空气温度和冷却过程。