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  1. JSJ

    Bridge damping

    Structural damping is useful in all dynamic analysis (seismic or traffic induced vibrations). The damping ratio (fraction of the critical damping, value of no vibration) depends on the energy dissipation due to elastic viscosity of materials, friction, etc. The traditionally considered value...
  2. JSJ

    EUROPEAN UPN SECTION CHANNELS

    The internal slope of the flanges of the UPN is 8%, as shown in my catalogue. FYI, the flanges of the IPN is 14%. Hope this helps.

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