Cold bend steel plate

[lamar89]

I'm working on an steel element for assembling a railing on footbridge. It's supposed to be a steel cold bent or welded module attached to concrete parapet by anchors. For the moment a corner at the post is presumed to be welded and locally stiffend by small rib. However I thought to cold bend it instead of welding. This node will be subjected to bending moment (closing or opening like on the sketch below), which means, that the direction of stresses will be the same as during cold bent process and section capacity may be limited. My question is how a yield strength is affected by cold bending process in such a case. The second issue is a minimum bending radius, which can be used. How can I determine it?

Generally I checked Eurocode 1993-1-3 but it covers rather profiles, where cross section is cold bent.

 

[EdStainless]

What material?
How thick?

 

[lamar89]

thickness 15mm
steel S355

 

[TomLee777]

The cold bending will force the steel to yield, leaving residual stresses built in the plate. But that's fine and typical in cold working. As for the bending radius, it should be at least 1 x t, but the larger the better stress wise, so it depends on your equipment and aesthetic looking.