PSI - Issue 59

Mykhailo Hud et al. / Procedia Structural Integrity 59 (2024) 692–696 Mykhailo Hud et al. / Structural Integrity Procedia 00 (2024) 000 – 000

694

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at the level of 1-3 floors, and then the loads were set at the level of 4-6 and 7-9 floors, respectively. At the same time, the load from the previous stage was removed. At the zero stage of the simulation, the behaviour of the frame under operational loads was investigated without applying additional loads. 3. Results and discussion At the zero stage, the natural oscillation frequencies (Table 1) are determined without additional loading. Fig. 2 shows 1 st , 5 th ,10 th and 14 th natural oscillation shapes; it is noticeable that horizontal movements of the floor slabs prevail.

Table 1. Numerical data of natural oscillation frequencies in the zero cycle.

Frequency

Modal mass

Own witnesses

Distribution coefficient

N

Period, s

Rad/S 29.07 64.263

Hz

В% 6.11 0.02 4.17

В% 6.11 6.14

1 2 3 4 5 6 7 8 9

0.03

4.62

0.21

4.13 0.26 -3.41 -0.03 -0.02 0.03 -0.02 -0.04 0.017 -0.06

0.015 0.011 0.011 0.011 0.011 0.011 0.011 0.011 0.011 0.009 0.009 0.009 0.009

10.23 13.30 14.36 14.37 14.37 14.37 14.37 14.37 14.37 15.92 15.92 15.92 15.92

0.097 0.075 0.069 0.069 0.069 0.069 0.069 0.069 0.069 0.062 0.062 0.062 0.062

83.57 90.24 90.24 90.24 90.24 90.24 90.24 90.24

10.31 10.31 10.31 10.31 10.31 10.31 10.31 10.31 10.35 15.42 31.43 36.80

0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 5.0

10 11 12 13 14

100.01 100.01 100.01 100.01

0.35 3.75 6.68 3.87

16.0

5.3

a

b

c

d

Fig. 2. Forms of oscillations at the zero stage of research a) first b) fifth c) tenth d) fourteenth.