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# FW: Shear

• To: "'seaint(--nospam--at)seaint.org'" <seaint(--nospam--at)seaint.org>
• Subject: FW: Shear
• From: Mark Pemberton <Mark.Pemberton(--nospam--at)lbdg.com>
• Date: Mon, 29 Jul 2002 16:26:52 -0700

```So, theoretically, what if you have plain concrete?

Mark Pemberton, P.E.

-----Original Message-----
From: Michael Bryson [mailto:MBryson(--nospam--at)mhpse.com]
Sent: Monday, July 29, 2002 3:47 PM
To: 'seaint(--nospam--at)seaint.org'
Subject: RE: Shear

The failure of the concrete beam would be in shear friction. This is how you
design corbels for example.

Anyway, the difference between wood and concrete would be because the shear
failuires are completely different. Concrete fails in diagonal tension while
wood fails in horizontal shear. I believe there is some sort of clamping
action that prevents the horizontal shear from occurring near the support of
a wood member. For a concrete beam the failure would most likely be from
arching action.

-----Original Message-----
From: Mark Pemberton [mailto:Mark.Pemberton(--nospam--at)lbdg.com]
Sent: Monday, July 29, 2002 3:14 PM
To: 'seaint(--nospam--at)seaint.org'
Subject: RE: Shear

That's a good question.  I have always wondered
what the concrete shear strength would be for a
member if it were forced to failed in shear in
a plane parallel to the load applied.  Anyone
have any input on this?  Perhaps the reduced
failure area exactly compensates an increased
strength due to the forced shear plane?

Mark Pemberton, P.E.
Sacramento, CA

-----Original Message-----
From: Jim Kestner [mailto:jkestner(--nospam--at)somervilleinc.com]
Sent: Monday, July 29, 2002 1:42 PM
To: 'SEAINT'
Subject: Shear

Does anyone know why for Concrete design per ACI 318-95  11.1.3.1 you are
not allowed to ignore concentrated loads within a distance "d" from the
support for shear yet for Wood design, you can ignore all loads within a
distance "d" from the support per NDS '97 3.4.3a (Figure 3D). Shouldn't
proceedures for wood and concrete be the same? Is NDS ignoring some effect
that they should not be?

Jim K.

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