## Horizontal Loads from Surcharging Revisted

## Horizontal Loads from Surcharging Revisted

(OP)

Previously I had asked the effect of an exterior surcharge loading (placed on a SOG) and what it would produce for horizontal loads on a basement wall. The last loading was a uniform loading and I got a lot of great comments.

As "luck" would have it my employer has changed there minds (again) and now I have to consider a different loading. Now it's a point load surcharge (SOG). I found a way to analyze it I'm just looking for experince to see if my solution SEEMS reasonable. The numbers I'm getting seem too small and I'ld like to hear from those of you with experience in this type of analysis.

Soil: Sand fill (placed 40 years ago)

First Wall....I have about a 10000lb load (applied to SOG). The load is 5' away from a 10' tall basement wall. I'm getting a total horizontal reaction of about 575 lbs (on a 1' strip of wall). Does that seem reasonable??

Second Wall...Same load, except slab is tied to this wall. Load is 3' away from a 5' tall retaining wall. I'm getting about 880 lbs of total horizontal reaction. Is that resonable??

To me the answers seem low but I have no feel for this type of analysis. TIA!!

As "luck" would have it my employer has changed there minds (again) and now I have to consider a different loading. Now it's a point load surcharge (SOG). I found a way to analyze it I'm just looking for experince to see if my solution SEEMS reasonable. The numbers I'm getting seem too small and I'ld like to hear from those of you with experience in this type of analysis.

Soil: Sand fill (placed 40 years ago)

First Wall....I have about a 10000lb load (applied to SOG). The load is 5' away from a 10' tall basement wall. I'm getting a total horizontal reaction of about 575 lbs (on a 1' strip of wall). Does that seem reasonable??

Second Wall...Same load, except slab is tied to this wall. Load is 3' away from a 5' tall retaining wall. I'm getting about 880 lbs of total horizontal reaction. Is that resonable??

To me the answers seem low but I have no feel for this type of analysis. TIA!!

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Andrew

## RE: Horizontal Loads from Surcharging Revisted

## RE: Horizontal Loads from Surcharging Revisted

The "Steel Sheet Piling design Manual", a 1969 publication of U.S.Steel, and "Foundation Analysis and Design", by Bowles, have the formulas to calculate the pressure distribution (both vertical and horizontal) of a point load.

If you do not have any of those publications, and want to see the formulas, I would be glad to e-mail a copy of that page.

AEF

## RE: Horizontal Loads from Surcharging Revisted

If you could send me an e-mail of one of the pages from EITHER of those books would be great. That would give me another check of my answers. My e-mail is: lundy@dmww.com

My current equations came from from "Principles of Foundation Engineering" by Das and the "Civil Engineering Reference Manual" by Lindeburg. These books had the same equations so it would be nice to see another equation (and better yet a different method to compare answers).

TIA!!

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Andrew

## RE: Horizontal Loads from Surcharging Revisted

Don't know how the load diminishes.

## RE: Horizontal Loads from Surcharging Revisted

dlew, your e-mail was very helpful and gave me the exact equation I needed to verify my work.

JAE, my maximum stress is just above 25psf, which would indicate that my solution is less conservative then yours, that's good :) Probably just depends on which method is used to calculate it.

Thanks again everyone!!

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Andrew