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Seismic forces from industrial equipment

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Seismic criteria in ASCE 7 and UBC are tailored for building structures.  
ASCE 7-93 specifically excludes industrial towers, equipment, etc., from its 
provisions. UBC 1997 has increased the confusion that existed in previous 
versions.  So far, I was using some judgment in estimating seismic forces for 
horizontal tanks supported on concrete pedestals.  The error in judgment, if 
any, would not affect the design in lower seismic zones because wind loads 
would more likely to be the governing lateral force.  However, for heavier 
tanks, the error in estimating seismic force may be less desirable.

Any suggestions for estimating seismic forces from industrial equipment such 
as horizontal tanks supported on concrete pedestals?

P. Rajendran
Service & Technology Corporation
105 SW Penn
Bartlesville, OK 74003
Ph: 918 336 8161  FAX: 918 336 8265

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