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shear friction from horizontal top reinforcement, to resist holdown anchor pop out in A footing?
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- Subject: shear friction from horizontal top reinforcement, to resist holdown anchor pop out in A footing?
- From: "Haan, Scott M POA" <Scott.M.Haan(--nospam--at)poa02.usace.army.mil>
- Date: Tue, 3 Oct 2006 13:28:27 -0800
Can you use
horizontal reinforcement in the top of a footing to resist the pop out of a
concrete tiedown anchor rod? I talked about this idea
with an intelligent engineer and he said it can't be
done.
I drew a free body
diagram of a pop out cone with the reinforcement developed in the cone and with
the shear friction parallel to the cracks with the vertical of shear
friction component cancelling out the upward force and the horizontal component
cancelling out. I'll e-mail a .pdf of the solution if someone wants to
look at it and tell me where it goes South.
He said the tension
is acting vertically across the inclined crack failure plane, and you've
got the shear component parallel to the crack and tension component
perpendicular to the crack, and that the shear friction formula in
ACI 318 for reinforcement at an angle to the crack only applies to
force component parallel to the crack.
This is where my head starts hurting assuming the free body diagram is inappropriate, couldn't you still increase the amount of horizontal reinforcement across the crack to cancel the horizontal component of tension perpendicular to the crack and add more shear friction for the component parallel to the crack ect...etc....
I don't believe horizontal reinforcement couldn't clamp concrete from
popping out with enough horizontal reinforcement clamping the pieces
together.
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