Research Article
Nonlinear Resonance Analysis of Slender Portal Frames under Base Excitation
Table 2
Natural vibration frequencies of the arched-roof frame.
| (m) | Natural vibration frequency (rad/s) | 1st mode | 2nd mode | 3rd mode | 4th mode |
| 1.0 | 21.02 | 51.73 | 122.60 | 167.05 | 3.0 | 17.81 | 48.51 | 97.77 | 151.60 | 5.0 | 13.20 | 40.79 | 74.02 | 113.41 |
|
|