Table 4 Prestressing force and corresponding measured 1\(\mathrm{st}\) and 2\(\mathrm{nd}\) frequencies by Jang et al. (2010).
From: On the Evaluation of Prestress Loss in PRC Beams by Means of Dynamic Techniques
Prestressing force | 1\(\mathrm{st}\) frequency | 2\(\mathrm{nd}\) frequency |
|---|---|---|
(kN) | (Hz) | (Hz) |
0 | 7.51 | 28.18 |
146 | 8.22 | 29.40 |
264 | 8.54 | 30.98 |
356 | 8.72 | 30.00 |
465 | 8.70 | 30.13 |
523 | 8.79 | 29.85 |