Welding point instead of hook in pile stirrups

[lpz31415]

Hi all!
I've a question about shear reinforcements in a pile.
In my worksite the rebar provider has send us the rebar cage shear reinforcement in a different way is was in the construction drawings.

Link
Link

In original drawings, the details was like this (there was a hook):
Link

Is this correct for construction? Where I can find information about this in the structural codes?
My opinion is that weld point is not valid, is no the same that a complete penetration joint welding.

Thank you all!

 

[r13]

First to check if welding is permitted for the grade of steel. Second to check the overlap length, if it qualifies as development length. The last to ask the contractor to provide evidence/calculation that supporting the point weld can develop yield strength of the steel, as this is a non-standard practice, that is not covered by ACI code.

 

[STrctPono]

What you are showing in your pictures would not be acceptable in my realm of engineering. Yes, 135 degree hooks would have been correct. If they had welded the hoops to each other to create a closed circular seismic hoop, that would have been even better but instead, they welded it to the longitudinal bars. No good.

In regards to performance in seismic events and providing confinement to the concrete, the best is welded circular seismic hoops, then continuous spirals, then closed circular hoops with 135 degree hooks, then closed square ties.