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# RE: Negative Pressure for the Concrete Foundation

• To: "'seaint(--nospam--at)seaint.org'" <seaint(--nospam--at)seaint.org>
• Subject: RE: Negative Pressure for the Concrete Foundation
• From: "Sherman, William" <ShermanWC(--nospam--at)cdm.com>
• Date: Thu, 22 Apr 2004 09:46:09 -0400

```For footing loaded outside the middle third:

bearing pressure = 2*P/(Y*B)

Y = 3(L/2 - e) = length of footing remaining in compression

e = eccentricity of load to centroid of foundation
L = length of foundation in loaded direction
B= width of foundation in perpendicular direction

William C. Sherman, PE
(Bill Sherman)
CDM, Denver, CO
Phone: 303-298-1311
Fax: 303-293-8236
email: shermanwc(--nospam--at)cdm.com

> -----Original Message-----
> From: Doshi_Arnik(--nospam--at)lindeindia.co.in
> [mailto:Doshi_Arnik(--nospam--at)lindeindia.co.in]
> Sent: Thursday, April 22, 2004 4:47 AM
> To: seaint(--nospam--at)seaint.org
> Subject: Negative Pressure for the Concrete Foundation
>
>
>      Dear Sir,
>
>      I am designing the open foundation for the shelters. The typical
>      problem is I am getting tension in the bottom of the
> footing. This
>      will leads to loss of contact between soil and footing
> bottom and
>      resulting to increase in the maximum bearing pressure.
>
>      I was just looking for the formula to modify the the
> bearing pressure
>      due to loss of contact of footing.
>
>
>      Regards,
>      Arnik Doshi
>
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