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# FW: punching shear and seismic compatibility moments

• To: seaint(--nospam--at)seaint.org
• Subject: FW: punching shear and seismic compatibility moments
• From: "Kravets, Pavel" <PKravets(--nospam--at)heery.com>
• Date: Mon, 23 Nov 1998 13:21:47 -0500

```
Try article by Jacob S. Grossman "Verification of Proposed Design
Methodologies for Effective Width of Slabs in Slab-Column Frames"
in ACI Structural Journal March-April 1997.
If you can not find it I'll be glad to fax it.

Pavel Kravets
pkravets(--nospam--at)heery.com <mailto:pkravets(--nospam--at)heery.com>

----------
From:  Nick Arenson [SMTP:arenson(--nospam--at)klaa.com]
<mailto:[SMTP:arenson(--nospam--at)klaa.com]>
Sent:  Friday, November 20, 1998 12:40 PM
To:  seaint(--nospam--at)seaint.org <mailto:seaint(--nospam--at)seaint.org>
Subject:  punching shear and seismic compatibility moments

My company is designing a multistory concrete hotel in Southern
California (seismic zone 4).  The construction is post-tensioned
floors
(7.5") on concrete columns with shear walls in both directions for
the
lateral system.  There are no drop panels or column capitals and we
are
typically using Studrail shear reinforcing in the slab.

When checking punching shear in the slab, we have a few different
cases including: factored gravity and seismic compatibility moments;
unfactored gravity  and seismic compatibility moments at a
displacement
of (3*Rw/8)*static displacements.

The magnitude of the compatibility moments is dependent on the
effective
properties of the slab.  The larger the effective slab width, the
higher
the slab moment of inertia and the compatibility moments are.

What effective slab width should be used to calculate the slab
properties?

All comments are welcome.

Thank You

Nicholas Arenson, PE
Krawinkler, Luth & Associates, Inc.
160 Jefferson Drive, Menlo Park, CA 94025
Phone: 650.688.4710 Facsimile: 650.688.4712
E-mail: arenson(--nospam--at)klaa.com <mailto:arenson(--nospam--at)klaa.com>
<mailto:arenson(--nospam--at)klaa.com <mailto:arenson(--nospam--at)klaa.com> >    Web: www.klaa.com
<http://www.klaa.com>
<http://www.klaa.com <http://www.klaa.com> >

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