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RE: seaint Digest for 11 Sep 2010

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Well, since about 25% of teh cells are grouted, maybe you shuld model it as
a wall of comparable f'c but only 1/4 the thickness?  The height and length
are what they are, so vary the thickness? / eric

-----Original Message-----
From: admin [mailto:admin(--nospam--at)seausa.org]
Sent: Sunday, September 12, 2010 12:00 AM
To: engineers(--nospam--at)kembcon.com
Subject: seaint Digest for 11 Sep 2010



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                       seaint Digest for 11 Sep 2010

Topics covered in this issue include:

   1: Relative Stiffnesses of Masonry Shear Walls (Compared to Concrete)
             by Bill Polhemus <bill(--nospam--at)polhemus.cc>
   2: SEAOSC New Madrid EQ Fault Report Webinar
             by SEAOSC(--nospam--at)aol.com



--------------------------------------------------------------------------
1                                Message:0001                            1
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From: Bill Polhemus <bill(--nospam--at)polhemus.cc>
To: seaint(--nospam--at)seaint.org
Subject: Relative Stiffnesses of Masonry Shear Walls (Compared to Concrete)

  Trying to model a complicated building base. Building is a wood-framed
apartment, 3 storeys (sorry, like the Brit spelling better this time),
sitting atop a "podium" constructed of a thick concrete slab supported
by a forest of concrete columns in the interior, and 8-inch CMU
shearwalls all along the boundary.

The CMU walls have grouted cells every 32".

I'm trying to figure out the shear demand for the walls in this (very)
irregular building, and as it has been a long time, I need to remember
how to show the "stiffness" of those walls acting as shear elements. I
recall that the spacing of grouted cells has a part to play (i.e. the
smaller the spacing the more stiff the wall), and I want to model the
walls assuming they are concrete elements with the thickness of those
elements reflecting the relative stiffness compared to a solid concrete
wall (in effect the masonry walls would be "thinner" than their nominal
thickness in the real world.

I need some guidance here. Anyone?

--------------------------------------------------------------------------
2                                Message:0002                            2
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From: SEAOSC(--nospam--at)aol.com
Subject: SEAOSC New Madrid EQ Fault Report Webinar
To: seaint(--nospam--at)seaint.org


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A reminder for you to join SEAOSC for a Webinar on the "Impact of  the New
Madrid Seismic Zone Earthquakes on the Central USA" Report  on Tuesday,
Sept. 14, 2010 at 12 noon PDT to 1:30 p.m.

To register, please go to _www.seaosc.org_ (http://www.seaosc.org/) .
Presenters: Anisa Como, Researcher, Mid-America Earthquake (MAE) Center and
 Theresa Jefferson, DSc, Associate Professor, Center for Technology,
Security,  and Policy, Virginia Polytechnic Institute and State University).
Abstract: SEAOSC will be presenting a webinar on Tuesday September 14th
from  12 p.m. to 1:30 p.m. on the Mid-America Earthquake Center's recently
published  report entitled "Impact of the New Madrid Seismic Zone
Earthquakes on
the  Central USA" issued October of 2009. This report shows that we have a
quite a b  it to do in this country to mitigate seismic risk. It is a slow
process and  often difficult since better building, retrofit and
infrastructure improvement  comes with a price, but the price of not doing
anything is
even higher. Similar  to Haiti, it's been approximately 200 years since
there
has been major shaking  in the New Madrid area. As such, it is hard to get
people to take the threat  seriously, but like Haiti it could happen at any
time.

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