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Re: Cranes and earthquake loads

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>for infrequent maintenance, a "parked position" can be designated and that 
>position used for the seismic design case (assuming that the probability of
>an earthquake during operational use is quite small.)
You'll want to verify this with the user; don't just finesse it. If the 
crane is expected to maintain control of the load during an earthquake, 
it needs to remain operational, so you don't want pieces coming off or 
too much deformation. At the very least you'll probably want to keep it 
in place, so give some thought to hold downs at the main rails and for 
the trolley. These provisions come into play for safety-critical 
situations, notably nuke plants, but you also see them for hazardous 
materials sites.

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