Sorry i have no idea about formulas for this.
Homemade sheet metal stiffening ribs.
Also instead of welding brackets have you considered plunging holes for the self tapping screws or even piercing a helix i believe dayton punch and die do these as an off the shelf option.
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Anyway in addition to what everyone else has suggested basic good design for stiffening sheet metal is to stagger your stiffeners so instead of putting all the bumps in a row which simply makes the gap down the center the weakest point you d want 3 smaller bumps in the intermediate rows so it would be 2 3 2 3 2.
Pressing grooves ribs or designs into a piece of sheet metal will greatly increase the strength.
Any form in the sheet metal will make it stronger as well as ribs consider dimples in the local area.
Panel w stiffening ribs flat panel snap on standing seam metal roofing system galvanized galvalume aluminum zinc stainless and copper kynar 500 finish with up to a thirty year warranty continuous length panels optional stiffening ribs and striations recommended to minimize oil canning not.
The stretched metal in those areas will hold tension in the panel and give it structural rigidity.
The stiffening rib is added to the bracket at the bending stage by separating the bottom bend blocks and inserting a metal strip in the gap which then forms a rib at the same time as the angle bend.
This is a simple and quick set up enabling the rib to be added at the same time of the 90 degree bend which means it comes free always good news for our customers.
Sheet metal with structural grooved seams.
Apr 13 2017 sheet metal brackets with stiffening ribs.
New accurl 125t sheet metal bending machine 6mm hydraulic press brake wc67y 125t 3200 for china duration.
Making stronger stiffening ribs webinar in this webinar we look at how fabricators traditionally form stiffening ribs and how there may be better more effective ways to form ribs.