Identification of Modal Parameters of Bridges Using Ambient Vibration Measurements

Table 2

Measured dominant frequency.

Measuring points	Trans. freq. (Hz)	Vert. freq. (Hz)	Long. freq. (Hz)
M1: 4R, 5R, 6R, 7R, 8R	5.62, 5.63, 5.47, 5.62, 5.63	5.45, 5.60, 4.98, 3.81, 5.61	5.61, 5.60, 3.81, 3.81, 3.81
M2: 2R, 3R, 6R, 9R, 10R	5.77, 5.97, 16.4, 5.97, 6.00	7.69, 5.50, 4.97, 5.43, 7.58	19.6, 5.43, 3.73, 5.43, 6.16
M3: 1R, 2R, 6R, 10R, 11R	5.76, 5.75, 5.57, 5.75, 5.75	7.85, 7.86, 4.95, 5.73, 5.73	21.7, 5.56, 3.85, 5.56, 5.56
M4: 6R, 4L, 5L, 6L, 7L	5.76, 5.76, 5.76, 5.49, 5.76	5.38, 5.74, 5.76, 5.36, 17.2	5.48, 5.48, 5.48, 5.48, 3.88
M5: 6R, 3L, 4L, 8L, 9L	5.54, 6.48, 5.75, 7.74, 5.02	5.02, 5.54, 5.78, 5.02, 5.54	3.86, 5.54, 5.54, 17.2, 5.54
M6: 6R, 1L, 2L, 10L, 11L	16.3, 6.70, 19.3, 5.67, 8.24	6.85, 20.3, 6.70, 8.17, 20.9	3.92, 7.95, 19.50, 6.29, 6.29
M7: 6R, 12, 13, 16, 17	4.95, 14.1, 4.99, 2.01, 2.00	4.99, 2.27, 4.99, 2.00, 2.01	16.1, 5.50, 5.50, 2.01, 2.02
M8: 6R, 12, 13, 16, 17	6.84, 16.6, 5.84, 2.00, 2.00	6.84, 2.39, 17.1, 2.00, 2.00	3.91, 6.28, 6.37, 2.00, 2.00