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Re: Seismic Question

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Rich,

I am going to ask that you restate your question with greater clarity
regarding what exactly you are having an issue with.

It is not my intent to be rude, but on my initial reading of your request I
am absolutely astonished that anyone using the title Structural Engineer
would ask such a basic general question "how do I perform a lateral analysis
of a concrete structure".  If you have no experience with building systems
there is no way anyone on this list can provide a 3 step lesson on lateral
design and rigidity analysis.  I would suggest you hire a qualified
consultant.

Additionally, if the building is 50 years old, I think you will find the
existing structure woefully inadequate vertically and laterally for support
of an additional level of concrete framing.  You should expect substantial
modification and upgrade of the existing systems.  There is a world of
difference between a life safety retrofit for continued use of an existing
building and current code compliant retrofit and remodel of an existing
building.


Paul Feather PE, SE
pfeather(--nospam--at)SE-Solutions.net
www.SE-Solutions.net
----- Original Message -----
From: "Richard Mullen" <rmullen(--nospam--at)damianolong.com>
To: <seaint(--nospam--at)seaint.org>
Sent: Tuesday, October 15, 2002 6:16 AM
Subject: Seismic Question


> We are currently rehabing a 50 year old reinforced concrete building
> supported by timber pile foundations.  The building is currently three
> stories in height and is proposed to be four stories when constructio is
> complete.
> How do you distribute seismic forces in the horizontal direction to the
> columns, diaphragms and shear walls for this reinforced concrete
three-story
> building?  Also how do you calculate the later stiffness of this building?
>
> Rich Mullen
> Structural Engineer
> Damiano Long LLC
> (856) 225-9300 Fax (856)
> e-mail rmullen(--nospam--at)damianolong.com
>
>
>
>
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