I need to build a steel frame with a steel web in it, as illustrated below. Flanges of the frame will be welded, as well as the web, along its whole perimeter.
Would adding a diagonal fold to the web allow this structure to whistand a bigger load? Or, for an equivalent loading, would the fold allow me to use a thinner web?
Considering the doubly folded strap of the web material welded on the ends to the frame, is there a critical angle for this double fold, where, at some point it is stronger to have no folds at all, rather than two folds.
Intuitively and I may be wrong about this, concentrating matter close to the diagonal tends to make the web behave as a truss. However shear flow must be disrupted as well with two folds of very obtuse angle. See illustration below.
Is this case can it be assumed that one single fold, whatever the angle of the fold, weakens the structure, but two diagonal folds, whatever the angle, makes it stronger?