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Re[3]: Crane Design

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My two cents worth; I would have to disagree with the methodology proposed by 
Rick.  There exists explicit criteria (mentioned in ASME NOG-1) which dictates 
when a bridge crane can be decoupled from its runway (based on the masses 
involved and the fundamental frequencies of the structure and crane).  Just 
assuming that it is a non-structural component is not valid.  The bridge crane 
can impact the seismic response of the runway and supporting structure.

Robert Rogers PE
Woolpert LLP

______________________________ Reply Separator _________________________________
Subject: Re[2]: Crane Design
Author:  seaint(--nospam--at) at Internet
Date:    3/17/99 6:30 PM


I would consider an overhead bridge cranes supported by a building structure as 
an example of manufacturing and process machinery, covered by Chapter 6 
(Nonstructural components) of the 1997 NEHRP Provisions, and therefore the 2000 
IBC.  Grade-mounted (gantry) cranes should be covered by Chapter 14 (Nonbuilding
Structures) of the 1997 NEHRP Provisions.

Rick Drake, SE
Fluor Daniel, Inc.