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Official Journal of the Japan Wood Research Society

Table 2 Resonance frequency (Hz) measured without the concentrated mass of the actual size round bar

From: Application of the vibration method with additional mass to timber guardrail beams

Specimen

End condition

Vertical vibration

Horizontal vibration

Cedar3

Hanging with two threads

189.200

185.400

Iron round bar insertion

188.000

–

Loose attachment to the post

191.650

180.250

Tight attachment to the post

209.840

185.680

Fixed ends

247.833

242.855

Cedar4

Hanging with two threads

192.800

186.200

Iron round bar insertion

195.360

–

Loose attachment to the post

195.200

180.820

Tight attachment to the post

228.460

186.220

Fixed ends

252.549

243.903

Cedar5

Hanging with two threads

213.000

207.160

Iron round bar insertion

210.480

–

Loose attachment to the post

213.280

200.580

Tight attachment to the post

230.280

204.660

Fixed ends

279.009

271.359

  1. Resonance frequency under fixed ends condition was estimated based on the measured frequency under free ends condition