Table 1 Prestressing force and corresponding measured 1\(\mathrm{st}\) and 2\(\mathrm{nd}\) frequencies by Saiidi et al. (1994).
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 | 11.41 | 43.99 |
26.7 | 13.47 | 44.89 |
56.6 | 14.15 | 45.71 |
80.9 | 14.49 | 45.57 |
120.1 | 14.72 | 45.86 |
131.3 | 15.07 | 45.87 |