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Re: Cranes and earthquake loads

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CMAA 70 for top running bridge cranes states: "Seismic forces are not 
considered in this design specification.  However, if required,
accelerations 
shall be specified at the crane rail elevation by the owner or specifier. 
The 
allowable stress levels under this condition of loading shall be agreed upon 
with the crane manufacturer."  
 
I have designed crane runways for the lateral force due to the inertia of
the 
crane mass/weight not including the lifted weight.  If the crane is only
used 
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.)