34 Multi-Shaker Modal Testing and Modal Identification of Hollow-Core Floor System 339 f1 = 14.25 Hz ; ζ1 = 1.3 % ; m1 = 15,489 kg f2 = 15.08 Hz ; ζ2 = 2.2 % ; m2 = 30,046 kg f3 = 15.48 Hz ; ζ3 = 1.7 % ; m3 = 115,456 kg f4 = 16.41 Hz ; ζ4= 1.2 % ; m4 = 217,545 kg 90° 90° 90° 90° -90° 0° 0° 0° 0° -90° -90° -90° 180° 180° 180° 180° + + + + Fig. 34.11 Predicted vertical mode shapes and modal complexity plots
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