Plate Warping due to Welding Heat

Yes, I would expect a 3/8" thick plate to warp when welded to #8 rebar (with a correspondingly large weld size). A thicker plate or welds requiring less heat input would warp less.

Does the warping cause issues for your attached element?

There will always be some warp, but weld technique can make it much worse.
Pre-heat and not just welding in order would help.

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P.E. Metallurgy, consulting work welcomed

eight #8 in 24" is pretty dense reinforcing, especially welded to BAR 3/8" material. I don't think I've ever designed a corbel with that much reinforcing. You might want to use BAR 1/2" or 3/4". Is the flare bevel weld on both sides and the full 3" width of the plate? How does that work for concrete cover to the #8 bars?

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So strange to see the singularity approaching while the entire planet is rapidly turning into a hellscape. -John Coates

-Dik

You have 3/8" cover to the main corbel bars?

I've done this in the past but with a 40 mm plate to match the cover.

Yeah, needs more cover by the looks of it.

This is a typical corbel design for precast concrete columns.
I assume concrete corbel is 24" wide and its projection is 8".
Eight #8 rebars will be welded to 3/8" with 4" long flare welding according to ACI corbel detail.
If this causes reinforcement congestion problem, I can use #9 rebars.
Generally this assembly will be hot-dipped galvanized finish.

JRW

Apologies for the unsolicited advice - in the past, I've welded vertical bars to embedded plates and let shear friction take the load into the corbel. Then the horizontal bars are hooked and developed in the node region of your S+t model. This lets you get cover and reduces the amount of welding to the plate.

I do not understand if it is a mandatory requirement that , all of the primary reinf . will be flare welded to bearing plate .. IMO, if the bearing plate is anchored properly , it is fine....

The following relevant clause is from ACI 318

16.5.6.3 At the front face of a bracket or corbel, primary tension reinforcement shall be anchored by (a), (b), or (c):
(a) A weld to a transverse bar of at least equal size that is designed to develop fy of primary tension reinforcement
(b) Bending the primary tension reinforcement back to form a horizontal loop
(c) Other means of anchorage that develops fy








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