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# RE: Footing sliding resistance - Friction

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• To: seaint(--nospam--at)seaint.org
• Subject: RE: Footing sliding resistance - Friction
• From: Enrico Aduana <eaduana69(--nospam--at)yahoo.com>
• Date: Tue, 21 Jun 2005 12:47:26 -0700 (PDT)

Kevin,

What are you telling this poor guy? He needs to stand up and be a man.

Chris,

Just make it smaller. It will be way over engineered anyways. Tell your geo- he/she is crazy. Believe me, I know what I am saying!!! If you are scared you are in the wrong business. You are wasting valuable time AND money. JUST DO IT I SAY.

Enrico Aduana

-----Original Message-----

From: Kevin Polin [mailto:KevinPolin(--nospam--at)Cyberonic.com]

Sent: Monday, June 20, 2005 12:15 PM

To: seaint(--nospam--at)seaint.org

Subject: RE: Footing sliding resistance - Friction

Instead of making the footing wider can see about adding a key at the

base of the footing, which will help prevent horizontal movement.

Kevin

http://WelcomeLending.com

-----Original Message-----

From: Christopher Haffner [mailto:chaffner(--nospam--at)gorge.net]

Sent: Monday, June 20, 2005 11:51 AM

To: seaint(--nospam--at)seaint.org

Subject: Footing sliding resistance - Friction

I'm having a Monday morning brain freeze and thought this was a

no-brainer

but can't find a definitive answer.

I am being told by the Geologist on a sloping (2H:1V) residential lot

that

the coefficient of friction is .45 (no units). He is also indicating

that a

wider footing will add some needed resistance to sliding.

I don't think this is correct in that the coefficient should only depend

on

the amount of gravity (vertical) load and not on the area of the bearing

area. Therefore, making my footings wider won't really help my sliding

problem other than to add a little more weight. Am I thinking clearly

here?

Another question.......I will have some granular fill (varies from 1' to

6'

thick) below a basement floor slab. I think this helps my sliding

resistance by adding weight to the system as it interfaces with the soil

below. Since I am having the slope benched I would like to use this

resistance (weight x coef of frict). Opinions????????

Thanks for your input!!!!!

Chris

Haffner Consulting Engineering

www.haffnerconsulting.com

Office & Fax: 541-478-3052

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