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(Else, It Is Probably A Shallow or Deep Beam) : y N VF

The document provides a 6-step process for designing corbels: 1. Check shear and tensile forces and ensure section size is adequate 2. Calculate shear-friction reinforcement 3. Calculate required flexural reinforcement 4. Calculate reinforcement to carry tensile force 5. Determine required main flexural steel 6. Provide closed horizontal stirrups and ensure adequate detailing

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Shakeel Waseem
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56 views2 pages

(Else, It Is Probably A Shallow or Deep Beam) : y N VF

The document provides a 6-step process for designing corbels: 1. Check shear and tensile forces and ensure section size is adequate 2. Calculate shear-friction reinforcement 3. Calculate required flexural reinforcement 4. Calculate reinforcement to carry tensile force 5. Determine required main flexural steel 6. Provide closed horizontal stirrups and ensure adequate detailing

Uploaded by

Shakeel Waseem
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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DESIGN OF CORBELS

Check a/d < 1


(else, it is probably a shallow or deep beam)
Step 1. Find factored shear Vu and tensile force Nuc
If Nuc is not specified, use a minimum value of Nuc = 0.2 Vu (ACI 11.9.3.4)
Compute nominal values of shear and tensile force
Vn = Vu / 0.85 ; Nnc = Nuc / 0.85
If Vn > 0.2 fc b d OR
Vn > 800 b d (lb. units)
then section size is inadequate (ACI 11.9.3.2)

Step 2. Compute shear-friction reinforcement (ACI 11.7.4.1)


V
Avf n
fy

where = 1.4 for concrete placed monolithically,


= 1.0 for concrete placed against hardened concrete (see ACI 11.7.4.3)

Step 3. Calculate required flexural reinforcement (11.9.3.3)


V a N nc (h d )
Af n
f y ( jd )

(assume jd = 0.85)

Step 4. Reinforcement to carry tensile force (ACI 11.9.3.4)


N
An nc
fy


2 Avf An
3

larger of A f An
f
0.04 c bd
fy
Step 5. Required main flexural steel (As) is given by (ACI
11.9.3.5 and 11.9.5)

Step 6. Provide closed horizontal stirrups (ACI 11.9.4):


Ah = 0.5 (As An)

Ensure adequate detailing (ACI 11.9.6 & 11.9.7)

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