I will be reviewing some exisitng monorails and also designing some new ones in the coming months. I was wondering if anyone has advice or could suggest a reference that addresses impact loads. In particular I am curious about what horizontal loads should be considered. AISC talks about a 20% load for crane runway horizontal forces, but doesn't this just apply to larger bridge cranes, which can move in two directions, and not single beam monorails? ASCE-7, section 4.10, seems to address vertical impact quite well. However, when discussing lateral forces they only refer to crane runway beams with electrically powered trolleys. Does this mean that by code I am not required to apply lateral loads to a monorail beam? I think that it is prudent to include some load to allow for some movement of the lifted load, but the 20% seems large. Any thoughts would be apprecitated. Thank you.
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