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Table 5 Frequency of the sandwich plate with a transverse 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 TS-WH TS-H10 TS-H15 TS-H20 TS-H30
1 136.66 112.48 103.42 95.931 85.199
2 396.24 341.04 327.32 310.66 295.38
3 414.10 363.97 337.73 337.28 306.52
4 721.13 606.52 522.80 458.10 372.90
5 772.52 624.27 565.6 503.34 424.48
6 777.49 699.98 666.61 617.88 550.11
7 825.12 719.34 684.78 624.81 562.95
8 837.88 722.36 697.81 664.91 596.62
9 868.49 744.68 711.15 684.39 628.42
10 898.14 804.58 774.32 702.51 631.67