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Horizontal Force Factors - Ceiling Hung Conveyor System

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Does anyone have any experience with, knowledge of or opinion on what Horizontal Force Factors should be used for a ceiling hung conveyor system?
 
This is as it relates to Zone 2B, Las Vegas for a Section 1632 Lateral Force determination per UBC 1997.  Conveyor is supported fifteen feet below its attachment to the building roof joists.  Supports are comprised of angle 2x2x1/4 attached to header steel.  The header steel is rigidly supported to the joists with bolted connections.  The vertical angle is bolted to header with two bolts.  The conveyor sits on a trapeze that is attached to the angle with either a two bolt connection or one bolt clip angle.
 
Thanks for any insight you can provide.
 
Robert J. Amoruso, P.E.
amoruso.ce(--nospam--at)att.net