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Re: Crane impact factors in AISC / Building Codes / ASCE 7/ CMA

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>Impact applies only to the runway beam as the deflection of the beam 
>creates a magnifying effect.  
>Consequently, impact does not apply to columns and foundations.  
If I were going to quibble about this, I'd say that any impact forces 
transmitted into the runway girders are necessarily carried by the 
attached columns. The load increase to the supporting structure is only 
the impact factor times the weght of the crane, not the impact factor 
times the total of the supporting structure live and dead loads. The 
impact allowance only reflects the inertia of the crane itself. 

Christopher Wright P.E.    |"They couldn't hit an elephant at
chrisw(--nospam--at)        | this distance"   (last words of Gen.
___________________________| John Sedgwick, Spotsylvania 1864)

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