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[SEAOC] Re: [SEAOC] Single jolts like an EQ......[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaoc(--nospam--at)power.net
- Subject: [SEAOC] Re: [SEAOC] Single jolts like an EQ......
- From: Dennis Wish <wish(--nospam--at)cyberg8t.com>
- Date: Wed, 06 Nov 1996 17:48:39 -0800
- Cc: seaoc(--nospam--at)power.net
At 02:39 PM 11/6/96 -0700, SFOAN (415) 243-3726 wrote: >Dear Antonio... >I am a concerned that the building may have had serious damage during the >Northridge earthquake. As you know welded steel moment frame buildings >suffered serious damage in terms of fracture of steel conncetions and column >base plates. I recommend that the building should be immediately inspected. >I am sure you are aware of the SAC guidelines. If not let me know, I'll >provide you with the reference. > >ahmed nisar >dames & moore >san francisco > I would not discount Mr. Nisar's letter, he may have a very valid point. However, after repairing numerous wood framed structures with lightweight concrete floor finishes I found that the greatest complaint by the tenants was excessive vibration experienced after the earthquake. We did extensive investigation of the building and uncovered some poor construction techniques, but no major structural deficiencies. I believe that the tenants were simply more conscience of the most minute vibration - fearing the worst. Long span Joists with lightweight concrete tend to be more flexible and transfer vibration from surrounding areas. This includes apartments in different area's of the building as well as trucks on the street. Recently, I stayed in an apartment in Chicago and thought that we were having consistent earthquakes until I adjusted to the traffic. The building vibrated like crazy - and this one was steel framed with wood diaphragms. My point is that you should rule out an increased (heightened) level of awareness by the tenants as the reason for their complaints. If after following Mr. Nisar's suggestion you don't find structural problems, you may be dealing with psychological problems. Dennis Wish PE ...
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