QUESTION ABOUT HOW TO LAP STEEL 1

[HITS1000]

IS THIS THE PROPER WAY TO LAP STEEL?



[URL unfurl="true"]https://res.cloudinary.com/engineering-com/image/upload/v1626368095/tips/QUESTION_byppn8.pdf[/url]

 

[BridgeSmith]

Looks like an acceptable way. They're technically what we would call a non-contact lap, being on opposite sides of the transverse bars, but the distance between them is not excessive. That's assuming they're positioned at the same location horizontally, i.e. the space between bars is only the diameter of the transverse bar between them. Theoretically, the lap should be increased by the clear distance between the lapped bars, but AASHTO doesn't require an adjustment, and as far as I know, ACI doesn't either.

Rod Smith, P.E., The artist formerly known as HotRod10

 

[handleman]

This is the proper way to lap steel:

https://www.youtube.com/watch?v=2QhYXd9AsPU

 

[BAretired]

Whenever you have a sudden angle change in a slab, reinforcing must be bent and lapped. Where the resultant tension in the bars tends to cause them to burst out of the slab, anchor the bars across the depth of slab as illustrated below.

BA

 

[Agent666]

I'd only ever strive to do what BAretired has detailed on the bottom stair crank. I think bridgebuster was merely addressing the immediate lapping, not passing comment on the overall detailing of the joint region.

Draw a strut and tie diagram of how the forces transition the cranked slab 'joint region' to transfer flexure and/or axial forces and you'll see there is likely no valid load path the way it was originally detailed.

https://engineervsheep.com