Research Article
Evaluation of Seismic Response Trends from Long-Term Monitoring of Two Instrumented RC Buildings Including Soil-Structure Interaction
Table 5
Dependence of modal frequencies on PRA.
| Mode | Direction | Model type | Modal frequency (y)–PRA (x) relationship(*) | |
| Building A |
| 1st | X | P/flexible base(**) | | 0.80 | Flexible base | | 0.59 | Y | P/flexible base | | 0.53 | Flexible base | | 0.40 | 2nd | X | P/flexible base | | 0.59 | Flexible base | | 0.34 | Y | P/flexible base | | 0.47 | Flexible base | | 0.33 | 3rd | X | P/flexible base | | 0.63 | Flexible base | | 0.65 | Y | P/flexible base | | 0.51 | Flexible base | | 0.52 |
| Building B |
| 1st | X | P/flexible base | | 0.57 | Flexible base | | 0.55 | Y | P/flexible base | | 0.60 | Flexible base | | 0.59 | 2nd | X | P/flexible base | | 0.69 | Flexible base | | 0.43 | Y | P/flexible base | | 0.69 | Flexible base | | 0.43 | 3rd | X | P/flexible base | | 0.51 | Flexible base | | 0.58 | Y | P/flexible base | | 0.51 | Flexible base | | 0.56 |
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(*)Modal frequency in units of Hz, PRA in units of g. (**)P/flexible base = pseudoflexible base.
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