Bending of flange leg
Bending of flange leg
(OP)

I have a situation basically like this picture. It is essentially a vent installed into an opening with a flange around the perimeter that bears on the surrounding of the opening - nothing else holding it in placce. A pressure on the face results in a distributed load on the perimeter which I represented on the picture with the black arrow. It is pretty much constrained from moving horizontally except for a small gap around the perimter between the frame and the opening. So my question is, when it comes to checking the bending of that flange, what would one use as the dimension of the moment arm? The distance from the black arrow to 'a' or the black arrow to 'b'?






RE: Bending of flange leg
RE: Bending of flange leg
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RE: Bending of flange leg
DaveAtkins
RE: Bending of flange leg
another day in paradise, or is paradise one day closer ?
RE: Bending of flange leg
In determining where the reaction point will be or the reaction distribution, think in terms of how the angle shape, or structure, will deflect, rotate or deform under load. The greatest deflection wants to occur at ‘a’, thus the bearing load or stress will be greatest at that point and diminish as you move out on the flange to point ‘b’. SRE’s sketch is a darn good approx. for conc. or wood, where some crushing will likely occur in the reaction material until bearing equilibrium is reached, thus highest bearing stress at ‘a’ and diminishing as you move out to ‘b’, where it may not be zero. For a steel bearing material I would tend toward DaveAtkins’ mid point btwn. ‘a & b’ because it is likely that the steel flg. the angle is bearing on will also deflect to some extent under load, thus moving the center of bearing toward ‘b’.