Annotation

The formulation of the problem about the temperature field of reinforced concrete structure, which is under the influence of high temperature caused by fire, is described. Problem solving was obtained through the Elcut Student software package. The change in the thermo-physical parameters of concrete from the temperature is taken into account. The temperature fields for unilateral heating according to the standard temperature regime of concrete slab thickness 100 mm, made of concrete with a density of 2350 kg / m3 on a silicate filler were obtained and analyzed. The temperature fields obtained from the calculations have been compared with allowance for and without taking into account the radiation component of the heat flux.

The account of heat exchange due to radiation between the structure and the heated medium significantly influences the results of the calculation. The temperature field in a concrete column of square section measuring 300 x 300 mm with high-strength concrete, which is heated from all sides, is studied. A flat problem of thermal conductivity is considered, neglecting the change in temperature along the column. The temperature distribution with the use of the dependences of the heat capacity and the thermal conductivity of the concrete on the temperature given in [4] and in [5] is obtained. A comparison was made with the results of experiments [2]. The difference between the results obtained using dependencies [4] and [5] does not exceed 12%. The temperature field in a column, obtained as a result of calculations using ratios [4], is more accurate than that obtained with application [5]. The difference with the results of experiments in the hottest zone does not exceed 6%.