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Structural soundness of combining lintels ! Chad 03-19-2007
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Posted by Chad on March 19, 2007, 12:09 pm
We have a dilemma. We will soon be placing precast concrete floor
slabs on the first floor of our new build. The manufacturers mandate 9
inch deep concrete lintels for any opening under 1800 mm. Builder has
already placed 6 inch lintels there. There is now a further 6-7 inches
of small bricks between these 6 inch lintels and the ceilikng.

To correct is it sufficient to add another lintel on top of the
existing one? ie. will a 6 inch plus a 6 inch lintel, one on top of
the other be as good as a SINGLE 9 or 12 inch lintel?

Much obliged
Chad.


Posted by RicodJour on March 19, 2007, 1:29 pm
Chad wrote:
> We have a dilemma. We will soon be placing precast concrete floor
> slabs on the first floor of our new build. The manufacturers mandate 9
> inch deep concrete lintels for any opening under 1800 mm. Builder has
> already placed 6 inch lintels there. There is now a further 6-7 inches
> of small bricks between these 6 inch lintels and the ceilikng.
>
> To correct is it sufficient to add another lintel on top of the
> existing one? ie. will a 6 inch plus a 6 inch lintel, one on top of
> the other be as good as a SINGLE 9 or 12 inch lintel?

It would be grand if things worked that way, but they don't.
Particularly in precast concrete. I doubt ( < weasel word) that you'd
have a catastrophic collapse, but the lower lintel would most likely
crack.

New building, right? Why start off on the wrong foot?

The only people that can definitely answer your question are the
people that designed the lintels.

R


Posted by Bob Morrison on March 19, 2007, 5:40 pm
In a previous post RicodJour wrote...
> It would be grand if things worked that way, but they don't.
> Particularly in precast concrete. I doubt ( < weasel word) that you'd
> have a catastrophic collapse, but the lower lintel would most likely
> crack.
>
> New building, right? Why start off on the wrong foot?
>
> The only people that can definitely answer your question are the
> people that designed the lintels.
>

I agree with Rico on this. I would assume that there is an architect or
engineer of record for a building that uses precast concrete floor panels.

Ask that that person the question and see what kind of answer you get.

--
Bob Morrison, PE, SE
R L Morrison Engineering Co
Structural & Civil Engineering
Poulsbo WA
bob at rlmorrisonengr dot com

Posted by RicodJour on March 19, 2007, 5:53 pm
Bob Morrison wrote:
> In a previous post RicodJour wrote...
> > It would be grand if things worked that way, but they don't.
> > Particularly in precast concrete. I doubt ( < weasel word) that you'd
> > have a catastrophic collapse, but the lower lintel would most likely
> > crack.
> >
> > New building, right? Why start off on the wrong foot?
> >
> > The only people that can definitely answer your question are the
> > people that designed the lintels.
> >
>
> I agree with Rico on this.

Aww, c'mon, Bob. We agree on everything. ;)

R


Posted by Chad on March 20, 2007, 5:05 am
I agree about doing it right.
Just getting the story straight before asking builder to correct it.

RicodJour wrote:
> Bob Morrison wrote:
> > In a previous post RicodJour wrote...
> > > It would be grand if things worked that way, but they don't.
> > > Particularly in precast concrete. I doubt ( < weasel word) that you'd
> > > have a catastrophic collapse, but the lower lintel would most likely
> > > crack.
> > >
> > > New building, right? Why start off on the wrong foot?
> > >
> > > The only people that can definitely answer your question are the
> > > people that designed the lintels.
> > >
> >
> > I agree with Rico on this.
>
> Aww, c'mon, Bob. We agree on everything. ;)
>
> R


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