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Table 4 Frequencies of the sandwich plate without stiffener and with holes in the core layer

From: Parametric study on dynamic responses of stiffened sandwich composite bridge deck panel

Natural frequency (cycle/time) for the bridge deck panels

Mode

WS-WH

WS-H10

WS-H15

WS-H20

WS-H30

1

128.40

104.32

93.984

86.314

78.368

2

312.45

273.16

263.08

251.39

240.26

3

387.43

332.62

316.78

301.15

289.27

4

767.73

629.8

537.03

464.75

379.53

5

817.42

669.53

642.52

590.77

497.11

6

818.71

713.06

658.59

612.06

572.18

7

849.00

772.43

689.29

657.41

597.29

8

851.04

775.83

719.35

681.30

623.40

9

910.41

777.49

723.66

697.77

626.65

10

985.87

821.08

758.76

743.02

635.58