PSI - Issue 20

Ivanov V.N. et al. / Procedia Structural Integrity 20 (2019) 222–229 Ivanov V.N. et al. / Structural Integrity Procedia 00 (2019) 000–000

226

5

Table 2. The change in air temperature in the room after turning off the heating. t out , (  С ) t int , (  С ) z=2 z=4 z=6

Air temperature after switching off the heating in z hours, (  С )

z=8

z=10

z=12

Brick

22 20 18 16 22 20 18 16 22 20 18 16 22 20 18 16 22 20 18 16 22 20 18 16 22 20 18 16 22 20 18 16 22 20 18 16 22 20 18 16 22 20 18 16 22 20 18 16

14.5 12.7 10.9 15.0 13.2 11.4 16.0 14.2 12.3 10.5 16.9 15.1 13.3 11.5 12.9 11.2 9.1 9.6 13.5 11.8 10.0 14.7 12.9 11.2 15.8 14.1 12.3 10.6 12.1 10.3 8.2 9.4 9.4 7.6

13.2 11.4

11.9 10.1

10.6 8.9 7.2 5.5 9.6 7.9 6.2 11.3 12.8 11.1

9.4 7.7 6.1 4.4 8.5 6.9 5.2

8.1 6.5 4.8 3.2 9.0 7.4 5.7 4.1 9.2 7.5 5.9

- 55

9.6 7.8

8.4 6.7

13.7 12.0 10.2 14.9 13.1 11.3 16.0 14.3 12.5 10.7 8.4 9.6 8.5 6.8 5.1 9.2 7.6 5.9 10.9 12.5 10.8 10.2

12.5 10.8

10.2

- 50

9.1 7.3

13.8 12.1 10.4 15.2 13.4 11.7 10.0 8.6

11.8 10.2

10.8

- 40

9.4 7.7

8.5 6.8

14.3 12.6 10.9

13.5 11.8 10.1

12.6 11.0

-30

9.3 7.7

9.2

8.5

Wooden

8.4 5.9 4.2 2.6 8.4 6.8 5.2 3.6 8.7 7.1 5.4 5.2 3.7 2.1 0.5 6.3 4.7 3.2 1.6 8.5 6.9 5.4 3.8 9.1 7.5 6.0 8.9 7.3

4.9 3.4 1.8 0.3 6.0 4.5 2.9 1.4 8.3 6.7 5.1 3.6 8.9 7.4 5.8 2.0 0.5

2.5 1.0

0.1 -1.3 -2.7 -4.2 1.5 0.1 -1.3 -2.8 4.4 2.9 1.5 0.1 7.2 5.8 4.4 2.9 -3.9 -5.2 -6.5 -7.8 -2.2 -3.5 -4.8 -6.2 1.2 -0.1 -1.5 -2.8 4.5 3.2 1.9 0.6

- 55

-0.5 -2.0 3.7 2.2 0.7 -0.8 6.3 4.8 3.3 1.8 8.8 7.3 5.8 4.3 -0.9 -2.4 3.8 -5.2 0.5 -0.9 -2.3 -3.7 3.5 2.1 0.7 -0.7 6.5 5.1 3.7 2.3

- 50

10.3

- 40

9.1 7.4

14.0 12.3 10.6

12.2 10.6

10.5

- 30

8.9

Effective three-layer panel

8.5 6.9 5.2 3.6 9.4 7.8 6.1 4.5 9.5 7.9 6.2

- 55

8.6 6.9

-0.9 -2.4 3.3 1.8 0.4 -1.1 5.9 4.4 3.0 1.5 8.5 7.0 5.5 4.1

12.7 11.0

- 50

9.2 7.5

14.0 12.3 10.5 15.3 13.6 11.8 10.1 8.8

11.2

-40

12.9 11.3

10.7

-30

9.6 8.0

Accidents can occur at any random point in time. Analysis of the emergency of the building shows the dependence of the decrease in room temperature on the initial temperature of the room (Table 2). The (fig. 4) graphically shows the temperature change at different temperatures of the indoor air. For example, under the conditions of Yakutsk in stone buildings that have an internal air temperature before the accident 22°C, the critical temperature 10°C occurs after 9 hours, and at 18°C - after 4 hours. In wooden buildings, the rate of decrease in temperature is even faster, respectively, at 22°C in 5 hours, at 18°C in only about 2 hours.