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Shear, Tension, and Block Shear Rupture Strength
- To: "Structural Engineers List" <seaint(--nospam--at)seaint.org>
- Subject: Shear, Tension, and Block Shear Rupture Strength
- From: "David Maynard" <davemaynard(--nospam--at)ceincorp.com>
- Date: Thu, 21 Oct 2004 11:07:40 -0600
I need a little bit
of assistance on this one. I am looking at a steel lifting eye that will
be welded onto the body of a haul truck for a mine. I am analyzing first
the lifting eye and then the welds holding it in place. My question is
analyzing the lifting.
First, this is a
vertical lift, putting tension onto the lifting eye. I turn to Chapt. D in
AISC LRFD 3rd Ed. and I check for Gross Section Yield and Net Section
Fracture. Then, due to the loads implied by this lifting eye, by way of a
shackle, I feel that Block Shear Rupture is another potential failure
mode. So, I turn to Chapter J4 for Design Rupture Strength. There
are three sections therein, Shear Rupture Strength, Tension Rupture Strength,
and Block Shear Rupture Strength. I got to wondering what Anv and Ant
were, so I turn to the Commentary. The Commentary for this particular
portion of the chapter discusses the failure mode of Block Shear only. It
also shows where Anv and Ant are, which are drastically smaller than the
effective areas of Net Section Fracture. This got me thinking, and finally
brings up my question....
Are "Shear Rupture
Strength" and "Tension Rupture Strength" in and of themselves failure modes, or
are they simply tools used for determining the overall "Block Shear Rupture
Strength?" I believe I know the answer, but I want to verify.
David Maynard, PE