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RE: Seismic Question

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I would recommend you get your hands on "Reinforced Masonry Engineering
Handbook" by Amrhein.  It has excellent examples of both rigid and flexible
diaphragms and their relationship to shearwalls and columns.  It is written
to apply to masonry, but concrete can be modeled with the same assumptions
used in the examples (at least for force distribution).  Another good
reference is "Seismic Design of Buildings and Bridges" by Williams.  Both
books are written for the UBC, but you should easily be able to extend the
methodology to whatever code you are using.

Be very careful about these older buildings, they can be very sensitive to
current code previsions.  If you are in a higher seismic zone, pay close
attention to detailing.  You may consider using FEMA 356 for the seismic
portion if your municipality will let you.

Best of luck,

Jake Watson, P.E.
Salt Lake City, UT

P.S. Where is the building located and what code are you using?

-----Original Message-----
From: Richard Mullen [mailto:rmullen(--nospam--at)damianolong.com]
Sent: Tuesday, October 15, 2002 7:16 AM
To: seaint(--nospam--at)seaint.org
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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