Prying Action on Round HSS Endplate Connections
Prying Action on Round HSS Endplate Connections
(OP)
I'm curious how to approach analyzing this connection scenario. The connection I see most often (and the focus of this discussion) is a square end plate with bolts at each corner. In other literature I've read, the development of the hogging plastic hinge is dependent on the connection geometry. For T connections, the hinge forms at the face of the stem; for rectangular HSS, the hinge forms on the interior face of the HSS chord wall (at least for design purposes). In terms of Round HSS, the location doesn't appear to be addressed, or even design procedures for Round HSS in general. Any thoughts on this?






RE: Prying Action on Round HSS Endplate Connections
RE: Prying Action on Round HSS Endplate Connections
RE: Prying Action on Round HSS Endplate Connections
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Take a look at Figure 7.12 and then at some of the yield line patterns in Figure 7.13. Notice the hot spot in the corner of the column on some of them. What's happening to the weld at that location? Most of the yield line patterns assumed by engineers for base plate design are inaccurate, but everyone does it. In reality the load will take the stiffest path to a stiff element. The yield line will form perpendicular to this path. As engineers we like square bolt patterns because they're hard for the contractor to screw up, but if you keep the bolts within the flange width (which usually requires a rectangular pattern) you ensure your yield line assumptions are valid.
Next time you're at Chili's see if you can find a "Chili's To-Go" sign that someone bent with their bumper. I've seen a few of these where the bolts were spaced so far away from the post that they looked like some of the plates in Figure 7.13.
RE: Prying Action on Round HSS Endplate Connections