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Rooftop Mechanical Equipment Loads

Rooftop Mechanical Equipment Loads

Rooftop Mechanical Equipment Loads

(OP)
I recently received comments from a building official regarding the vibration from the mechanical equipment that sits on top of a building.  In the truss design software, is there anywhere that specifies vibration load?  Is this account for anywhere in the design documents?  Looking for help to respond to this inquirey.

Any assistance is greatly appreciated.

RE: Rooftop Mechanical Equipment Loads

Robbins software has the capability of applying moving loads.  They are moving distributed loads or moving point loads.  It is still treated as a static load though. I think that mechanical equipment would produce a dynamic  oscillating load, which the program does not have that capability.  You would need a finite element program that could handle modal analysis for that situation.  I seriously doubt that any of the other wood roof truss programs have that capability.      
      

RE: Rooftop Mechanical Equipment Loads

I spoke with Don Scott P.E. from Truswal Systems. He recommended to double the loads of the unit to account for vibration. This load would be considered dead.

RE: Rooftop Mechanical Equipment Loads

How about a method of isolating the mechanical platform or distributing it's load over more trussed area?

I know Mitek has seismic loading, but I'm not familiar with it.

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