RV: Foundation during Earthquake[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: <seaint(--nospam--at)seaint.org>
- Subject: RV: Foundation during Earthquake
- From: "raul labbe" <rlabbe(--nospam--at)ctcinternet.cl>
- Date: Mon, 2 Jul 2001 16:51:37 -0600
De: raul labbe <rlabbe(--nospam--at)ctcinternet.cl>
Para: seain(--nospam--at)seaint.org <seain(--nospam--at)seaint.org>
Fecha: Lunes, 02 de Julio de 2001 04:47 p.m.
Asunto: Foundation during Earthquake
I require some comments from you on this issue :
Usually most of the seismic codes or guidelines, are
specifying a minimum compressed area under
footings/foundations, when subjected to overturning
moments arising from the quake. This may be 75% to
80% of the foundation plan, pending on the Code.
( I don't remember exactly, I think AASHTO is asking for
80% for footings of bridge piers ).
Now, this requirement, is independent and additional to
the checking of safety against overturning, e.g. Mr/Mo > 1.5 or 2.0
where Mr = Resisting Moment, and Mo= Overturning M.
It happens, now and then in design, that this second requirement is
fully accomplished, but not the first one, e.g. having a soil compressed
area less than 75%.
If this is the situation, what is the real effect upon the whole structure ?
Is this allowable ?
Thanks in advance.
- Prev by Subject: RE: Running applications from the Web?
- Next by Subject: RV: Web's civil/structural engineers associations.
- Previous by thread: FW: BUILDING DRAWINGS???
- Next by thread: Hoop ties in grade beams