θ (˚)

Theory

Eigenvalue

Transient

Nonlinear

(Imperfection)

Nonlinear

0

4225.1

4482.4

4221

4130.98

4844.52

5

4288.5

4542.9

3102.72

3087.43

3102.9

10

4490.2

4737.8

2805.12

2801.46

2805.33

15

4865.1

5111.9

2773.92

2772.19

2774.4

20

5489.5

5758.2

2995.92

2994.05

2996.01

25

6526.5

6869.0

3616.08

3606.86

3616.1

30

8366.0

8896.4

5160.6

5132.29

5160.85

35

12183.5

13197.0

9781.2

9681.77

9782.44

40

23814.6

26549.0

12463.2

12208.8

12467.2