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# RE: Coefficient of Friction

• To: seaint(--nospam--at)seaint.org
• Subject: RE: Coefficient of Friction
• From: Scott Maxwell <smaxwell(--nospam--at)engin.umich.edu>
• Date: Wed, 8 Jan 2003 19:19:03 -0500 (EST)

```If you REALLY need something REALLY formal, then do some actual testing of
your situation.  Have a container of a known weight placed on the surface
in question, then push the container until it slides and measure the load
that it took to move it.  You know have all the information needed to
determine your coefficient of static friction for your actual parameters.
You can even vary the parameters to see what effects things like water on
the surface do to the coefficient.

You are going to have to face the fact that you are not really going to
get a more "definitive" answer any other way.  Any value(s) for the
coefficient of friction that you find will be an approximation (i.e. there
will be a +/- factor to it even if they don't state it) or a range.  This
is because the coefficient is highly dependent on the condition of the
surface of the concrete and to a lesser degree the condition of the steel
(i.e. is it rusty).  A broom finish concrete surface will likely have a
higher coefficient than a super flat, extremely smooth troweled surface.

HTH,

Scott
Ypsilanti, MI

On Wed, 8 Jan 2003, YI wrote:

> Thanks for the response.
>
> I actually found those web references but was looking for something more
> "formal", something I can quote from to prove my case.
>
> I'm trying to prove to the city of LA how the steel shipping containers
> behaves under high wind, when they are laying on the dock / ground.
>
> Speaking of that, what about the coefficient of friction between steel
> and soil? (that's a pretty broad question I guess)
>
> Y i   Y a n g  P. E.
> Summit Engineering Inc.
> Santa Rosa, CA
>
>
> -----Original Message-----
> From: Scott Maxwell [mailto:smaxwell(--nospam--at)engin.umich.edu]
> Sent: Wednesday, January 08, 2003 12:06 PM
> To: seaint(--nospam--at)seaint.org
> Subject: Re: Coefficient of Friction
>
>
> >From my statics book (Vector Mechanics for Engineers: Statics by Beer
> and Johnston), coefficient of static friction between metal and stone
> (don't have between metal and concrete):  0.30-0.70
>
> For the following website:
>
> 6
>
> coefficient of friction per the Australian Bridge Design Code is 0.5.
>
> >From an old SEAINT post:
>
> http://revobiz.dyndns.org/group/seaint/2001a/msg01976.html
>
> the coefficient of friction per ACI 349-97, Appendix B is 0.4.
>
> >From the following website:
>
> http://www.supercivilcd.com/FRICTION.htm
>
> the coefficient of friction is 0.45.
>
> To get the websites, I did a search on Google for ["coefficient of
> friction" AND steel AND concrete].  Everything in the [] brackets was my
> search phrase.
>
> HTH,
>
> Scott
> Ypsianti, MI
>
>
> On Wed, 8 Jan 2003, YI wrote:
>
> > Does anyone has a reference for the coefficient of friction between
> > steel and concrete?  I only found the steel to steel coefficient of
> > friction in the "civil engineering reference manual for the pe exam"
> > by Lindeburg, 7th edition.  TIA
> >
> > Y i   Y a n g  P. E.
> > Summit Engineering Inc.
> > Santa Rosa, CA
> >
> >
>
>
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