Corner Bars & Construction Joints 2

From a purely structural mechanics perspective, I'd be inclined to be quite permissive with this:

1) I assume that opening and closing joint moments dominate the design. For that, I don't know that the joint changes anything.

2) Technically, you'll have both in plane and out of plane shears to deal with at the joint. By the book, if you're claiming shear friction for that, you do have to develop for fy on either side of the joint with no prorating for partial development. For a low demand situation like this, though, I'd be willing to let that ride based on judgment.

3) If your contractor were amenable to it, I'd consider the detail shown below to have the following advantages:

a) more constructible with the joint in play and;

b) structurally better than the original detail.

This only words for small diameter bars however (#5/#4). You could do something similar with 180 hooks too if they'd fit.

Another option would be to simply turn the hooks downwards instead of sideways. This, also, would be no worse that the original detail. There really is no lapping intent between the outer bars and the hooks of the inner bars.

I would move the control joint a couple of feet from the corner... because of the change in construction and direction, corners are notorious for initiating cracking...

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-Dik

The abutment and wing wall will transfer shear and moment to each other.. The detail proposed by contractor will not provide necessary resistance for shear friction .. I have observed tilting and separation of walls at top level in long terms..

If CJ inevitable, better to provide shear key and the CJ some 100 mm apart.

The horizontal inside face bars shall be developed to the requirement for bars in compression. I will try to use smaller bar, and reduction permitted through As(provided)/As(required) to avoid using hooked bars from the beginning, as it is considered ineffective in compression anyway. Otherwise, the wall is too thin.

Using U-bars in both directions would improve the performance of the corner.

Good point.

Thank you all for the input.

I didn't seal the sheets under question, but the design engineer has been following this thread.

I think he is going with the U-Bar setup.