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Re: seismic restraint at mechanical units

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In a message dated 1/3/2002 4:18:47 PM Pacific Standard Time, njineer(--nospam--at) writes:

The Seismic Restraint Manual Guidelines for Mechanical Systems

Addendum No. 1 to Seismic Restraint Manual Guidelines for Mechanical Systems (PDF file size: 408kb - 3 minutes)

The 1997 Uniform Building Code (UBC) mandates a major change in the calculation of seismic forces on the non-structural components of a building including piping, ductwork and conduit. The factors used to calculate seismic loads and the equations using those factors have changed dramatically. This Addendum will provide the necessary information for design professionals to calculate the required forces and accordingly determine the appropriate Seismic Hazard Level (SHL) for the various locations within the building. It should be noted that for a specific project/building, the SHL will vary with the location of the braced element within the building. This variation in SHL is dependent on equipment location and changes from ground level to the building roof. Also included are additional tables detailing the structural members to be installed by contractors once the SHLs have been determined by the design professional. This Addendum is intended for use only in those jurisdictions where the seismic regulations are based upon the provisions in chapter 16 of the 1997 Uniform Building code.