Order number

Natural frequencies (HZ)

Modes description

1

2.2084

The left side―backward, the right side―forward.

2

2.2084

The left and right―forward, the middle part―backward, accompanied with torsional vibration of Fishbelly steel truss.

3

2.4213

The left, right and middle parts, in their own range, do forward and backward antisymmetric vibration.

4

2.4218

Middle part―backward, the left and right parts―forward, and the external side vibrates forward.

5

2.8850

Middle part of right side―backward and the two sides―forward; middle part of left side―forward and the two sides―backward.