Stair-landing reinforcing

[ztengguy]

Is there any benefit to having the reinforcing cross at the intersection, instead of just having the bars parallel and not individual bars?

 

[hokie66]

Your file would not open for me.

 

[KootK]

There's a big benefit. If you used uninterrupted parallel bars, they'd pop out the bottom of the stair when the knuckle experienced opening (positive) moment.

The greatest trick that bond stress ever pulled was convincing the world it didn't exist.

 

[apsix]

KootK has explained the major reason. Another reason is that concrete cover will be compromised due to the bend radius.

 

[KootK]

I'd never considered the cover aspect before.

This won't apply directly here but I've seen typical details for parking ramps where parallel bars are allowed so long as the angular change is four degrees or less. I'm not sure if that's been verified rigorously somehow or if it's simply based on a lack of problems with past structures.

The greatest trick that bond stress ever pulled was convincing the world it didn't exist.