Nib Torsional Design
Nib Torsional Design
(OP)
Hi Gents,
Do you have any idea, how to design
a Nib for torsion?
I appreciate your response
Do you have any idea, how to design
a Nib for torsion?
I appreciate your response
When was the last time you drove down the highway without seeing a commercial truck hauling goods?
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RE: Nib Torsional Design
What's a Nib? New in box? New International Version Bible?
LOL.
RE: Nib Torsional Design
I don't think that is a stupid question at all. I asked the same question in this thread last week, but then the thread was deleted for some reason.
DaveAtkins
RE: Nib Torsional Design
RE: Nib Torsional Design
RE: Nib Torsional Design
thanks for your interest in my thread.
ususally my threads are not that popoular ;)
I've attached a sketch describing
the nib.
many thanks
RE: Nib Torsional Design
Now please elaborate on what you mean by "torsion" on a nib. In most cases, the IT beam will act as a unit, resisting torsion from unbalanced loads (more load on one side of the IT than the other).
Is that what you are after?
RE: Nib Torsional Design
thanks for your Query
u r right about the use of nib.
for inducing torsion on the nib, simply assume u have different point loads on the nibs (shown in my previous attachment)on each side of the MAIN BEAM.
look forward to ur response.
RE: Nib Torsional Design
This is definitely an important limit state. There was a large parking garage collapse in Nashville 8-10 years ago due to this. The precast double-tees were dropped on the level below and several levels collapsed. IIRC, it was under construction and the double-tees were installed only on one side and left there for some time.
RE: Nib Torsional Design
For torsion, assume dead load on both sides of the IT beam and live load on one side only. Torsion is calculated from this across the IT span. Design additional stirrups and longitudinal bars to respond to this torsion in conjunction with vertical shear forces on the beam.
RE: Nib Torsional Design
DaveAtkins
RE: Nib Torsional Design
I appreciate all of your replies.
I think 271828 approach sounds logical,
although my sketch doesn't show the situation
that the nib itself is under torsion but
I would appreciate any idea that contains suggestion
for designing those sort of nibs.
I hope im not confusing you guys!!
cheers,
RE: Nib Torsional Design
RE: Nib Torsional Design
There is no torsion on the corbel itself, but rather the torsion is taken by the whole beam. With precast construction, the construction stability issue is overturning rather than torsion.