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- To: seaoc(--nospam--at)power.net
- Subject: [SEAOC] See attached
- From: "Antonio S. Luisoni" <asl-cse(--nospam--at)worldnet.att.net>
- Date: Wed, 06 Nov 1996 12:47:12 -0800
- Cc: seaoc(--nospam--at)seaoc.org
Hi fellow engineers:
Subj: Single jolts like an EQ, but not EQ!!!!! Date: 96-11-06 15:33:17 EST From: ASLCSE To: seaoc(--nospam--at)power.net CC: seaoc(--nospam--at)seaoc.org, asl-cse(--nospam--at)worldnet.att.net I am talking about a 5-story office building in the S.F. Valley, designed and constructed in the early/mid sixties. Steel frames in both directions (with welded cover plates), grade beams at the base, pile foundation. Floor framing is lt.wt. concrete fill over plywood on wood joists spanning between steel beams. A few tenants (at one side of the building) are complaining about random "jolts" that started about a year ago and are occuring increasingly. Naturally the owner would like to find out what is going on (and so do I !) By the way, the one and only side of the building where the complaints are coming from has continuous brick spandrels which are supported top, btm. & mid-height at every column (about 21 ft o/c). One of my guesses is that there might be some "locked-up stresses" which are being "released". (Spandrel connections and/or welded connections). There appear to be no visual deformations and/or cracks. The building was "inspected" after the EQ by a structural engineer, but no beam/col or spandrel/col connections were exposed or inspected. I thank your for the upcoming comments and suggestions. Antonio S. Luisoni Consulting S. E.
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