Fundamental Frequencies of Vibration of Footbridges in Portugal: From In Situ Measurements to Numerical Modelling

Table 7

Comparison of frequencies (Hz) between measurements in  situ and the analytical model.

Mode direction	Measurements in  situ	Analytical model
Longitudinal	2.77	2.77
Vertical	3.79	3.34
Transversal	3.73	3.73
Torsion about 𝑧 (vertical)	?	5.71
Torsion about 𝑥 (longitudinal)	7.91	8.80