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Double Prying Action?

Double Prying Action?

Double Prying Action?

(OP)
When designing for prying action per p. 9-10 of the Steel Construction Manual, the deformation of the connecting element, only, is considered. It seems to assume that the supporting element is infinitely stiff. I have a case where I am attaching a WT to the face of a W column, and there is prying action from the WT.

What got me thinking is that the flange width and thickness for my WT and my W column are identical. Intuitively, I know there is going to be deformation of the W column as well - so should I design the connection by doubling the prying force?

RE: Double Prying Action?

For design purposes, consider both members as separate cases connecting to an infinitely stiff surface. IMO, this is conservative. An infinitely stiff supporting surface would create a stronger levering effect which is what prying action is all about. If the supporting surface is allowed to deform (as is the case for "double prying action"), a smaller prying effect will develop.

RE: Double Prying Action?

Agreed.

Plus, opposing forces are always equal and opposite--so you never double a force due to an opposing force.

DaveAtkins

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