Civil Engineering Reference
In-Depth Information
Table 4.6
Sorted natural frequencies in the X direction
No.
Mode
Frequency (Hz)
Effective mass
Effective mass
percentage (%)
1
1
33
127.423
63.711
2
8
104.7
9.613
4.807
3
9
119.8
8.178
4.089
4
3
62.6
6.859
3.429
5
40
471.7
4.787
2.394
6
6
96
4.311
2.156
7
28
311.3
3.019
1.510
8
5
73.6
2.492
1.246
9
39
446.7
2.357
1.178
10
25
279.7
2.137
1.069
11
29
332.4
1.550
0.775
12
17
187.9
1.265
0.632
13
65
887.4
1.157
0.578
14
66
906.1
1.091
0.545
15
52
627
0.921
0.461
16
57
726
0.774
0.387
17
33
367.4
0.747
0.373
18
68
929.4
0.729
0.365
19
72
985.7
0.724
0.362
Total effective mass percentage
90.067
Table 4.7
Sorted natural frequencies in the Y direction
No.
Mode
Frequency (Hz)
Effective mass
Effective mass
percentage (%)
1
2
35
137.014
68.507
2
5
73.6
14.175
7.088
3
9
119.8
7.691
3.846
4
22
247.58
2.954
1.477
5
16
173.46
2.471
1.236
6
27
304.852
2.156
1.078
7
30
341.853
1.974
0.987
8
17
187.9
1.692
0.846
9
65
887.4
1.624
0.812
10
33
367.4
1.519
0.759
11
57
726.1
1.457
0.729
12
52
627
1.143
0.571
13
66
906.1
1.081
0.540
14
13
153.8
0.989
0.494
15
73
1017.9
0.916
0.458
16
24
261.2
0.796
0.398
17
54
675.7
0.712
0.356
Total effective mass percentage
90.182
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