Simultaneous Measurements of the Vehicle, Track, and Soil Vibrations at a Surface, Bridge, and Tunnel Railway Line

Figure 8

Natural modes of the bridge, (a) first bending at 3.7 Hz, (b) first torsion at 7 Hz, (c) second bending at 11 Hz, and (d) second torsion at 12.7 Hz. (Note that the almost zero amplitudes at the support points at the end of the bridge have not been measured and are not included in the figures.)

(a)

(b)

(c)

(d)