Table 2 Prestressing force and corresponding measured 1\(\mathrm{st}\) and 2\(\mathrm{nd}\) natural frequencies by Kim 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 | 22.73 | 98.42 |
39.2 | 23.08 | 98.73 |
58.8 | 23.23 | 101.39 |
78.4 | 23.39 | 101.65 |
98.0 | 23.60 | 101.70 |
117.6 | 23.72 | 102.54 |