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IBC 2006 Equation 18-3

IBC 2006 Equation 18-3

IBC 2006 Equation 18-3

(OP)
Sorry for the simple question, but you need a break every once in a while... Equation 18-3 of the 2006 IBC is:
d^2=4.25*(Mg/(S3*b))
Is S3 evaluated at a trial depth "d", so that it's an iterative solution?  I'm just making sure.  Thanks in advance for the reassurance.

RE: IBC 2006 Equation 18-3

Yes it's iterative and it's a pain.

RE: IBC 2006 Equation 18-3

I agree, not to be iterative here.

Mike McCann
MMC Engineering
Motto:  KISS
Motivation:  Don't ask

RE: IBC 2006 Equation 18-3

Iterative, also known as irritative.

RE: IBC 2006 Equation 18-3

dust off the old cubic root solution equations?

yeah, I iterate too.

RE: IBC 2006 Equation 18-3

I wrote an excel macro to solve it, not too hard.

RE: IBC 2006 Equation 18-3

Yes - I agree

Engineering International sells a spreadsheet for this.  I think it is about $40.00.  Seems to work well

RE: IBC 2006 Equation 18-3

(OP)
Thanks so far everyone.  I too wrote an excel program to do it for me.  Now my question is about Equation 18-1, and specifically "d" and "S1" within.  

"d" is limited to 12' for purpose of computing lateral pressure.  "S1" is the allowable lateral bearing pressure at 1/3 of the depth "d".  

Once again, we have an iterative process (or excel), but I'm confused: is "S1" limited to a maximum value at 4' deep (= 1/3 * 12')?  This seems silly, but I can't figure out what the intent of the verbage is about.  Can you all help me out with the intent and why it's written the way it is?

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