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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