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Re: HIGH CLEAR HEIGHT CONCRETE WALLS

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I have some very high lateral loads also and I was going to create pilasters (in the 3 ft x 4 ft square range) integral with the wall to cut down on the reinforcing and concrete required. But, now I am trying to figure out what to do about tying all the vertical bars in the pilasters and whether it should meet column tie reinforcing requirements. The pilasters are functioning primarily but are needed to assist the 10" wall since it can't nearly make it 90 feet. I would specify SC concrete but I am still not confident it will get down in between the layered vertical bars. Here is the conceptual detail of the wall in plan:

http://structuraldetails.angelfire.com/


Will
 

On Tue, Nov 8, 2011 at 2:27 PM, Rick Stone <rwsmadconc(--nospam--at)aol.com> wrote:
I have successfuly gone 65 ft with tilt-up, and 73 feet in single lift pours. In the latter case, used self-consolidating concrete (no way to vibrate internally that far down, and external vibrators rejected due to the sketchy conditions with the bracing shaking loose) and did a lot of set time testing to control the form pressures.........


-----Original Message-----
From: gtg740p <gtg740p(--nospam--at)gmail.com>
To: <seaint(--nospam--at)seaint.org> <seaint(--nospam--at)seaint.org>
Sent: Mon, Nov 7, 2011 6:49 am
Subject: Re: HIGH CLEAR HEIGHT CONCRETE WALLS


It's not planned for one pour.

WH

On Nov 6, 2011, at 3:52 PM, Jay Shilstone <j2008.s(--nospam--at)shilstone.com> wrote:

I hope you aren't planning on placing in a single pour. That would be
a recipe
for disaster. You will need multiple pours or slip form.

Can't respond to engineering aspects since I am not an engineer.

You might want to include a comment on the geometry of the building.
I figure
rectangular but round is easier to brace.

Jay Shilstone
Sent from my iPad

On Nov 6, 2011, at 2:05 PM, William Haynes <gtg740p(--nospam--at)gmail.com> wrote:

Can anyone tell me what construction difficulties may be encountered
for a
building that is around 90 feet clear height using poured concrete? Shipping on
precast this long would be an issue and I don't see it practical to create
continuity in precast if using stacked modules. I am concerned with the cost of
bracing the high poured walls during construction as they are being built and
figuring this cost into a preliminary cost estimate.

Will Haynes

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