Beam Links Spacing

[ahmedhegazi]

Hello All,

ACI 318 specifies maximum spacing between links along the beam span,
however there is no specified value i could find for spacing of legs perpendicular to the span,what do you normally use and based on what?

Regards

 

[csd72]

ahmed,

normally this is only an issue if your beam is much wider than its depth or if its primary source of load is axial. Can you give a bit more information on your particular situation?

 

[cdous]

Usually for beame wider than 50cm you would have to put a second stirr-up.
This is based on Eurocodes and the relative National Annexes and is given as st,max

 

[valleyboy]

Here in the UK, the maximum longitudinal spacing of links in a beam is 0.75 x d.

Any tension bar cannot be more than 150m from a vertical leg of a link perpendicular to the span.

Similar provisions exist in EC2.

 

[ahmedhegazi]

My beam is 1500mm Wide X 700 Deep , loads are vertical loads resulting only in bending and shear.

I normally provide one keep the spacing perpendicular to span around 300 mm as common practice but could not find any reference in ACI 318

 

[cdous]

Valleyboy,
If I understood your post you mean that for a 40cm wide beam you would need at least an enclosing link and an inner link .
I believe the stmax=0.75d #9.2.2 EN1992.01.01 refers to the maximum distance of vertical links in the beam's width and not along its length.