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Re: Wind Loading on Existing Structures

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I ain't no wind expert.  But if in 30 years, the building has seen 155
mph sustained on 4 occasions, would it not be reasonable to expect that
it will see 155 mph on 4 occassions in the next 30 years?  Is it not
realistically possible it will see one typhoon with greater than 155 mph
sustained in the remainder of it's life.  It doesn't seem like 155 mph
sustained is an unrealistic demand to shoot for.

Jeff Coronado, S.E.
West Covina, CA

T. Eric Gillham PE wrote:
> Listserver Members:
> Does anyone on the list have any experience with Code required wind
> loading on existing structures?  In particular, I am interested in
> knowing if there are any codes that promulgate a lesser wind loading
> requirement on existing structures, as compared to new structures,
> along the lines of NEHRP, ATC or other codes with regard to seismic.
> Currently, I have a project that involves a 30+ year old metal
> warehouse structure that is being checked for code compliance for our
> 155mph design wind speed.  This structure has been through 4 major
> typhoons with recorded wind speeds exceeding 155mph sustained.  Based
> upon this, and the current condition of the structure (it has
> weathered the years, no pun intended, quite well with minimal if any
> signs of corrosion), it would appear that MAJOR retrofitting would be
> overkill, although there are some areas that need to be addressed
> regardless of what requirements I adhere to.
> Any suggestions would be welcome.
> T. Eric R. Gillham PE
> PO Box 3207 Agana Guam 96932
> Ph: (671) 477-9224
> Fax: (671) 477-3456
> Pgr: 720-8891
> gk2(--nospam--at)

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