3D beam modal analysis using D3_BEAM element .


   3D beam input file

  Dimensions:          length = 1.0 m, width = 0.1 m, height = 0.1 m.
  Material properties: E = 2e11 Pa, ρ = 7890 kg/m3, ν = 0.3.

  

  Theoretical frequency for the first mode: 81 Hz
  

  Computed 1st modal frequency:  80.83 Hz