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[SEAOC] RE: [SEAOC] ASCE NO. 58 Use

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On Fri, 14 Jun 1996 12:22 -0400 (EDT)  scott.horn(--nospam--at)srs.gov wrote:
>     I have encountered this situation when designing a buried structure.  
>     I found ASCE 4-86 to be especially useful.  But be careful in it's 
>     use.  It considers a yielding and non-yielding wall.  And if you are 
>     attempting to save your customer money and there are not other drivers 
>     which would dictate thicker walls, your wall will yield.  The equation 
>     as shown in ASCE 4-86, I believe is in error.  The equation for the 
>     active solution (the Mononobe-Okabe method) has two "angle of wall 
>     friction" summed then evaluates the cosine.  This is wrong!  The 

As a general warning to anyone using the Mononobe-Okabe formula, watch out for typos in the formula.  
I've seen in printed incorrectly in a number of places, especially, for some unknown reason, the one 
for passive pressure.  As an example, the AASHTO bridge code printed it with a sign error or two for 
several years.

Nigel

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Nigel Mends, PE
email:  nmends(--nospam--at)mt.net
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