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  1. DKDMA

    Building/runway impacts for overhead cranes.

    Thanks so much for your response dauwerda, I do know some states do require 25% for underhung cranes.
  2. DKDMA

    Building/runway impacts for overhead cranes.

    dauwerda, Your are right, I should have been more clear. I have been designing (powered) underhung cranes using 25% impact. Hand geared cranes require no impact adjustment. Be that they may be a double girder underhung crane or single girder underhung crane, but controlled with pendants still...
  3. DKDMA

    Building/runway impacts for overhead cranes.

    Reviewing section 4.9.3 in ASCE 7-16 states the following: The maximum wheel loads shall be increased by the following percentages. Vertical Impact Force: Monorail Cranes (powered) - 25% Cab-operated cranes - 25% Pendant operated cranes - 10% Hand-geared - 0% I have been using 25% impact for...
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