ACI section 12.10.5 - Cutoff

[wardak21]

"12.10.5.2 — Stirrup area in excess of that required
for shear and torsion is provided along each terminated
bar or wire over a distance (3/4)d from the termination
point. Excess stirrup area shall be not less than
60bws/fyt. Spacing s shall not exceed d/(8βb)."

Could anyone tell me what does it mean?, the extra stirrups should be put above the terminated bar or in a region beyond the cutoff point?

Respects,

 

[frv]

It reads "along the the terminated bar", so I would assume that it is "above" the terminated bar (as you state). But why not just extend the bards to the compression zone?

 

[DST148]

The code does not permit flexural reinforcement to be terminated in a tension zone unless one of the three conditions in 12.10.5 is satisfied. The stirrups per section 12.10.5.2 are required before the cut-off point and not after. The intention is to restrain diagonal cracks by closely spaced stirrups. Although providing extra stirrups(over and above the regular stirrups) over 3/4d would be acceptable, I would design the stirrup spacing to suit this section requirement in the first place.

 

[wardak21]

Thanks I got it