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RE: Footing Overturning in Rock

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Using those pesky little anchors that we have been talking about the last couple of days.


Joseph R. Grill, P.E. (Structural)

Shephard - Wesnitzer, Inc.

Civil Engineering and Surveying


-----Original Message-----
From: Rich Lewis [mailto:seaint03(--nospam--at)]
Tuesday, July 18, 2006 9:02 AM
To: seaint(--nospam--at)
Subject: Footing Overturning in Rock


I’m working on the design of a simple spread footing bearing on rock.   The overturning moment due to wind is large requiring a large footing to meet the 0.6*D + 1.0*W load combination.  I was wondering about possible techniques for engaging the rock to help resist overturning and uplift.  Is it feasible to anchor into the rock to do this?  Are there other methods to utilize the dead weight of the rock to help resist overturning?


Thanks for your help.