Research Article
Response Surface-Based Finite Element Model Updating of Steel Box-Girder Bridges with Concrete Composite Decks
Table 5
Comparison of results before and after modal parameter updating.
| | Modal order | Measured frequency (Hz) | Mode shape | Modal damping ratio (%) | FEM before updating (Hz) | Difference (%) | GA-updated FEM (Hz) | Difference(%) |
| | 1 | 4.00 | First-order asymmetric vertical bend | 1.61 | 3.77 | −5.75 | 3.88 | −3.00 | | 2 | 5.03 | First-order symmetric vertical bend | 4.76 | 4.99 | −0.79 | 5.08 | +0.99 | | 3 | 5.27 | First-order symmetric torsion | 5.18 | 5.30 | +0.57 | 5.26 | −0.18 | | 4 | 7.23 | First-order asymmetric reversal | 2.38 | 7.47 | +3.32 | 7.38 | +2.07 | | 5 | 10.99 | Second-order symmetric torsion | 4.12 | 11.96 | +8.83 | 11.83 | +7.64 | | 6 | 14.01 | Second-order asymmetric reversal | 2.04 | 14.95 | +6.71 | 14.77 | +5.42 |
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