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# Re[2]: Slab buckling

• To: Paul Crocker <seaint(--nospam--at)seaint.org>
• Subject: Re[2]: Slab buckling
• From: Zhoub002 <zhoub002(--nospam--at)hawaii.rr.com>
• Date: Tue, 8 Jun 2004 11:25:14 -1000

```It depends on how the other end of the slab is supported. If it is unrestrained,
then the slab is unlikely to buckle given
the friction is mobilized between the slab and subgrade. But if it is
restrained for in-plane movement, then theoretically the slab needs
to be checked for buckling from restraining the retaining wall.
Perhaps you could check with Euler's buckling strength against the
restraining reactions.

Bz

PC> I did a check like that once, but I didn't find any
PC> short-cuts or simplified methods, so I went back to engineering
PC> principles.  Keep in mind that you have two things working in your
PC> favor: your slab is continuously supported against buckling
PC> downwards and you have the weight of the slab resisting buckling
PC> upwards.  Of course, the slab doesn't weight very much
PC> comparatively, but it adds up over long distances.  Beyond that, I
PC> found myself making a lot of reasonable assumptions.  Good luck.

PC> Paul Crocker, PE, SE

>>>> Mark Pemberton <markpemberton(--nospam--at)sbcglobal.net> 06/08/04 11:43AM >>>
PC> I've been asked by a plan checker to check a slab that is
PC> restraining the base of a retaining wall for potential buckling.
PC> The retaining wall is about 11 feet tall.  I've done a great many
PC> retaining walls and have never been asked to check this.  If it's
PC> a problem wouldn't we be hearing of buckling slabs at residential
PC> basements everywhere?  Does anyone know of a simplified approach
PC> to checking this?  Thanks in advance.

PC> Mark Pemberton, S.E.
PC> Pemberton Engineering
PC> Davis, CA

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