Table 5 Stiffness damage identification results based on verification coefficient of frequency
Frequency order | Formation | Construction completion stage | Pre-demolition stage | Deviation | |
|---|---|---|---|---|---|
Frequency verification coefficient \(\beta_{1}\) | Stiffness reduction | Equivalent coefficient \(\beta_{{2}}\) | |||
1st order (fundamental frequency) | Vertical formation (full bridge anti-symmetry, single-span positive symmetry) | 0.97 | 0% (initial model) | 1.03 | 7% |
-5% | 1.00 | 3% | |||
-10% | 0.96 | -1% | |||
-15% | 0.93 | -3% | |||
-20% | 0.90 | -6% | |||