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Posted by Steve Barker on May 17, 2007, 9:09 pm
That's a good point. Even with an engineers recommendation, there won't be
a proper pier under the new location(s)
--
Steve Barker
> Frankly, I would be more concerned about what the moved posts are sitting
> on.
>
>
>
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Posted by Bob Morrison on May 18, 2007, 10:25 am
In a previous post Steve Barker wrote...
> That's a good point. Even with an engineers recommendation, there won't be
> a proper pier under the new location(s)
>
If I were the engineer I would specify that a new footing must be placed
under any new columns. It generally means cutting a hole in the floor
slab, excavating 10-12 inches deep, adding a rebar mat and pouring back
flush with the floor. A variation can include hanging the new column from
the beam before pouring concrete so that the base plate is buried in the
new pour -- no exposed anchor bolts to trip over.
--
Bob Morrison, PE, SE
R L Morrison Engineering Co
Structural & Civil Engineering
Poulsbo WA
bob at rlmorrisonengr dot com
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Posted by PeterD on May 18, 2007, 9:48 am
>Frankly, I would be more concerned about what the moved posts are
>sitting on.
>
>
Good point. Most basement slabs are a flat pour, which should be OK
here. But in reality it could be anything, couldn't it? One could do
some cores and determine the composition of the slab at each proposed
location...
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Posted by CWatters on May 18, 2007, 3:57 pm
> I have an 8"x5" steel I-beam in the basement spanning 30' with a
> single post in the center
So the beam is actually two 15' spans.
> I would like to move one post to 8' and would like to know how far in
from the
> other end I would have to add an additional post.
If the load was uniform then you might expect the beam to be ok as long as
you don't create an unsupported section greater than 15' long.
30-8 = 22 which is greater than 15' so you do need another post say 7 or 8
ft in from the other wall. eg A spacing of 8,14,8 would seem possible.
But it's likely the load isn't uniform and there are other factors that must
be considered. You absolutly must get this designed by a professional (which
I am not).
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Posted by Glenn on May 18, 2007, 4:49 pm
message
>
>> I have an 8"x5" steel I-beam in the basement spanning 30' with
>> a
>> single post in the center
>
> So the beam is actually two 15' spans.
>
Technically, the beam span is closer to 12', time you allow for
the point of inflection past the post on either side. So it is
carrying a good load.
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