Research Article
Construction Stage Seismic Vulnerability Evaluation of a Continuous Girder Bridge with the Cast-in-Place Cantilever Construction Method
Table 2
The modal information of the FEM.
| Construction stage | Modal no. | Frequency (Hz) | Mode shape | Mode shape description |
| Substructure | 1 | 21.236 | | Middle pier longitudinal bends | 2 | 34.176 | | Middle pier transversal bends | 3 | 81.022 | | Middle pier longitudinal bends |
| Middle cantilever | 1 | 2.378 | | Middle pier longitudinal bends; main girder rotates around the supporter transversal direction | 2 | 3.539 | | Main girder rotates around the supporter vertical direction | 3 | 5.932 | | Middle pier transversal bends; main girder transversal bends |
| Long cantilever | 1 | 1.161 | | Pier longitudinal bends; main girder rotates around the supporter transversal direction | 2 | 1.458 | | Main girder rotates around the supporter vertical direction | 3 | 2.570 | | Main girder vertical bends |
| Middle span closure/bridge completion | 1 | 1.359 | | Main girder vertical bends | 2 | 2.421 | | One middle pier transversal bends; main girder vertical bends | 3 | 3.128 | | Middle piers transversal bends; main girder transversal bends |
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