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Re: Tilt Up systems

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Walter

The PCI Design Handbook (www.pci.org) has some generic details for
similar construction to what you are describing.

Walter Sheen wrote:
> 
> Gerard,
> 
> Thanks for your quick reply. We don't use tilt up here in Peru. We are
> building 5 story welded wire mesh reinforced concrete 4 inch thick wall
> buildings and the cost of the forms if very important in the total cost of
> the building. So we are thinking about tilt up to lower this cost, but we
> wondered about connections and thought there might be some system already
> developed, that's what I meant by tilt up system providers.
> 
> I'll get the references you suggest.
> 
> Thanks a lot
> 
> Walter
> ----- Original Message -----
> From: "Gerard Madden" <GMadden(--nospam--at)mplusl.com>
> To: <seaint(--nospam--at)seaint.org>
> Sent: Thursday, June 07, 2001 5:37 PM
> Subject: Re: Tilt Up systems
> 
> Walter,
> 
> not sure what you are looking for in terms of information, but I am not
> personally aware of any "tilt up system providers"? Are you talking about
> precast panels delivered to the site? Contractors, if the are detail
> oriented and can get a good foreman and crane operator can successfully
> build these types of buildings figure most of them do this kind of work
> around here, but there are some out here who seem to specialize in tilt-up
> . . . that doesn't necessarily mean they are good at what they do however.
> 
> I have always designed tilt-up where the panels are formed, reinforced, and
> cast on site where the slab on grade of the building serves as the downface
> form of the panel.
> 
> As far as seismic goes with tilt-ups, the most critical elements are wall
> anchorage, sub-diaphragms, collectors/drag lines, in-plane and out of plane
> strength. Also, since almost every tilt-up has windows and doors everywhere,
> wall pier detailing becomes common.
> 
> It is used all the time in seismic zone 4. I won't comment on how effective
> it is in resisting seismic forces, but I will say that the cost outweighs
> everything. The building is very cheap when compared to your typical
> commercial project. I think they can bet built for anywhere between 26 to 33
> bucks a square foot.
> 
> I have personally designed tilt-ups in seismic zone 4 on soil type E with
> nearsource issues to a type A fault. Doesn't get much more seismic than that
> for a tilt-up. If you want a pretty good discussion on the behavior, check
> out Amerhien's book on masonry ... very similar., Also, the Seismic Design
> Manual #2 has a tilt-up building design example.
> 
> Ron Hamburger wrote a paper after the Northridge EQ about tilt-ups that is
> probably worth your time to read it so you can see how this system will
> behave if things are overlooked or simply not known at the time of design.
> Not sure how to get a hold of a copy... try SEAONC's book store.
> 
> To summarize, if detailed properly, I think tilt-ups perform as intended in
> seismic regions
> hope that helps,
> gerard
> SF,CA
> 
> >>> wsp(--nospam--at)terra.com.pe 06/07/01 03:13PM >>>
> Dear Fellows:
> 
> I would appreciate information of Tilt Up systems providers in the Miami
> area, and your comments about it's use in a High Risk Seismic Area.
> 
> Walter E. Sheen
> Civil Engineer
> (511) 446-6237   (511) 446-9407
> wsp(--nospam--at)terra.com.pe
> 
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-- 
++++++++++++++++++++++++++
Forrest T. Braun, P.E.
BBFM Engineers, Inc.
Ph (907)274-2236
Fx (907)274-2520
Anchorage, Alaska
http://www.bbfm.com
++++++++++++++++++++++++++

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