Research Article

Identification of Modal Parameters of Bridges Using Ambient Vibration Measurements

Table 6

Measured dominant frequency of upstream bridge.

Measuring points1st freq. (Hz)2nd freq. (Hz)3rd freq. (Hz)

16R, 1, 2, 3, 41.30V, 2.00VTL, 1.98L, 1.30V, 1.981.98VT, 2.88L, —, 1.99VTL, ——, 3.31L, —, 2.86L, —
16R, 5, 6, 7, 81.28V, 2.03VT, 2.03VT, 2.03VT, 2.03VT2.03VT, 2.92V, 2.92L, 2.92L, 2.92L4,27V, —, —, —, —
16R, 9, 10, 11, 121.29V, 1.29V, 1.29V, 1.30V, 1.30V2.05VT, 2.06VT, 2.06VT, 2.05VT, 2.06VT—, —, —, 2.95L, —
16R, 13, 14, 151.28V, 1.28V, 1.28V, 1.28V 2.02VT, 2.02VT, 2.02VT, 2.02VT—, 2.91L, —, 2.91L
16R, 17, 18, 19, 201.29V, 1.29V, 1.29V, 1.29V, 1.28V2.03VT, 2.03T, 2.03VT, 2.03T, 2.03T4,23V, 3.34L, —, 3.35L, 3.35L
16R, 21, 22, 23, 241.28V, 1.28V, 1.28V, 1.28V, 1.28V2.02VT, 2.02VT, 2.02VT, 2.02VT, 2.01VT—, 2.90L, —, 2.91L, 2.91L
16R, 25, 26, 27, 281.28V, 1.28V, 1.28V, 1.28V, 1.28V2.00VT, 2.00VTL, 2.00VT, 2.00VT, 2.00VTL—, 2.88L, 2.88L, 2.88L, 2.88L
16R, 29, 30, 31, 321.27V, 1.80VTL, 1.80VT, 1, 80V, —2.10VT, 2.10VTL, 2.10VT, 2.10VT, 2.10VT—, 2.88L, 2.88L, 2.91L, 2.91L
16R, 33, 34, 35, 361.28V, 1.28V, 1.28V, 1.28L, 2.00L2.02VT, 2.02VTL, 2.02VTL, 2.02TL, 2.84L—, 2.84L, —, 2.84L, —
16R, 37, 381.27V, 4.20VTL, 2.00T2.01VT, —, 2.14V4.23V, —, 8.88L
16R, 39, 401.29V, 2.90L, 2.07V1.97VT, 7.83T, 4.63T—, 13.7V, 11.8L
16R, 41, 421.27V, 2.00T, 3.24L1.95VT, 2.52L, 4.2T4.21V, 35.8V, 26.4V

V: vertical; T: transverse; L: longitudinal.