Table 3 Ten modal frequencies of the Golden Gate Bridge from ref. 50: seven vertical and three torsional, all below 0.5 Hz.

From: Crowdsourcing bridge dynamic monitoring with smartphone vehicle trips

m

Type

Shape

Frequency (Hz)

1

V

A

0.106

2

V

S

0.132

3

V

S

0.170

4

V

A

0.216

5

T

A

0.230

6

V

S

0.301

7

T

S

0.339

8

V

A

0.371

9

T

A

0.445

10

V

S

0.461

  1. The vibration mode numbers are indicated by m, where frequencies are sorted in ascending order; mode types V and T refer to vertical and torsional modes; A and S refer to anti-symmetric and symmetric mode shapes with respect to the middle of the main bridge span.
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