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Re: existg CMU

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Harold,

I didn't follow, do you have a picture or a drawing you could share?

Bill,

What about removing the top course and casting a solid beam on top or if the
block is already in, break out the face shell construct a form on one side
and cast solid concrete on top. I assume you are above the ceiling otherwise
nevermind. I think you're in a crack because it will be hard to get anything
to calc out that has to reach down so far to restrain the wall and not be
bulky.

Rand


----- Original Message ----- 
From: "Harold Sprague" <spraguehope(--nospam--at)hotmail.com>
To: <seaint(--nospam--at)seaint.org>
Sent: Thursday, June 10, 2004 5:34 PM
Subject: RE: existg CMU


> Bill,
>
> Having been a former "rod buster", I feel the contractor's pain.  When I
> became an engineer (just after dirt was invented), I vowed to always try
to
> perceive how to build the things I design.
>
> What I normally do is to stop short with the top of the CMU wall as you
did
> to accommodate vertical deflection of the frame.  The top course is NOT a
> bond beam.  It is too hard to construct.  The vertical bar goes to the top
> of the CMU, but it is not a bond beam.  I use A block and a half height
bond
> beam CMU at the top which allows me to use a stiff grout to grout in the
top
> course.  The next course down IS a bond beam.   The third course down from
> the top is a cut block if I need to adjust for elevation to make the CMU
> height divisable by 8".
>
> A lot of times, in lieu of bolting an angle to the wall, I will place in a
> steel T section.  The web is placed in a head joint.  There are headed
studs
> welded to the web which anchors it into the CMU wall.  The flange of the T
> serves as a weld plate.  I have also had studs welded onto the flange in
the
> shop which gives me something to bolt to without having to drill into the
> CMU in the field.
>
> If you don't understand the verbiage, let me know.  If you DO understand,
> explain what I said to me;>)
>
> Regards,
> Harold Sprague
>
> >
> >-----Original Message-----
> >From: Sherman, William [mailto:ShermanWC(--nospam--at)cdm.com]
> >Sent: Thursday, June 10, 2004 10:58 AM
> >To: 'seaint(--nospam--at)seaint.org'
> >Subject: RE: existg CMU
> >
> >Here is the situation: we had called for a bond beam at the top of all
> >masonry walls; the walls span vertically and we are using clip angles
with
> >drilled-in anchors for top support attachment to a concrete beam above at
> >one structure. But we missed the callout for this detail at one of two
> >floor
> >levels and the Contractor says he didn't include anchors at that floor in
> >his bid.
> >
> >Then a decision was made in the field (per contractor and engineer's
> >representative) to lower the bond beam by one course, since the concrete
> >frame was constructed first and the bond beam could not be practically
> >constructed in the first course directly below the concrete beam. (Hence
> >the
> >question: could it have been built in the specified location? I have to
> >admit, I haven't come up with a "practical" method.)
> >
> >The contractor used standard hollow block for the top course; but our
> >drilled-in anchors are intended for grouted block or solid block. While I
> >don't mind the bond beam being lowered by one course, I would have
required
> >a solid block at the top course to allow for the drilled-in anchors - but
> >now it is too late. So we are trying to find the most economical
solution.
> >If we grout the cells where anchors are to be installed, the bond beam in
> >the course directly below will prevent flow of grout into cells below.
The
> >walls are exterior CMU walls and the anchors must resist wind suction
> >pressure on the wall. (There is a gap between the top of CMU and bottom
of
> >concrete beam to allow the beam to deflect and the clip angles have
> >vertical
> >slotted holes to permit vertical movement.)
> >
> >William C. Sherman, PE
> >(Bill Sherman)
> >CDM, Denver, CO
> >Phone: 303-298-1311
> >Fax: 303-293-8236
> >email: shermanwc(--nospam--at)cdm.com
> >
> >-----Original Message-----
> >From: Andrew Kester [mailto:akester(--nospam--at)bbma.com]
> >Sent: Thursday, June 10, 2004 7:52 AM
> >To: seaint(--nospam--at)seaint.org
> >Subject: existg CMU
> >
> >Bill wrote:
> >
> >1. If I want to use a drilled-in adhesive anchor to attach to in-place
> >hollow concrete masonry units, is it practical to drill a hole into the
> >open
> >cells and pump grout into them, in order to obtain a solid material to
> >anchor to?
> >We have them do that all of the time. I prefer the entire cell to be
> >filled,
> >but some engineers have them grout a foot or so above and below an
anchor.
> >They can do this by slot cutting or drilling, which is quite easy in
hollow
> >CMU (done it myself).
> >
> >2. If a new masonry wall is to be constructed below an in-place concrete
> >frame, is there any practical way to construct a reinforced bond beam
> >directly below the concrete beam?
> >What are you trying to accomplish with the bond beam? IF you need a
lateral
> >brace in addition to the concete frame in place above it, then I would go
> >one course below the top and construct my bond beam. That way the last
> >course they are just sliding block into the gap and mortaring. IF you
have
> >to have the bond beam right at the top of the wall, then it is possible
but
> >they have to do some slot cutting and pressure grouting...
> >
> >Andrew Kester, PE
> >Longwood, FL
> >
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