Headed stud shear capacity in masonry bond beams

[ron9876]

If you use a steel plate with multiple headed studs embedded in the top of a bond beam how do you determine the shear capacity perpendicular to the wall. ACI 530 gives a formula that appears to be intended for a single anchor. Surely if more studs are added then the capacity would go up.

 

[civilperson]

Yes if spacing of studs and edge distance are accounted for.

 

[ali07]

See publication by Nelson Studs. Obviously your capacity in a group reduces significantly if studs are spaced closer.

 

[ron9876]

But I am referring to the top of a masonry bond beam with capacity limited by ACI 530. The method in that code is so limited that it is difficult to determine what the intent of the code is.

 

[haynewp]

ACI 530 appears to address tension cone overlap and reductions but not shear cone overlap. I would make the minimum spacing of studs be greater than the shear overlap areas since the equations are based on a single anchor shear capacity. Usually, I limit one anchor per cell spacing anyway.