Increase in vertical stress for flexible footing by Janbu, Bjerrum & Kjaernsli
Increase in vertical stress for flexible footing by Janbu, Bjerrum & Kjaernsli
(OP)
Hello all - I hope all are doing well.
I'm looking for some guidance on the chart by Janbu, Bjerrum & Kjaernsli which shows the increase in vertical stress for flexible footing for various z/B ratio against L/B ratio.
I would like to re-create the equation to calculate the value shown on the chart, this is where i require some guidance. I have found little literature on the subject which fully explains the basis of the chart.
The original report gives the formula on the attached picture and I have translated the terms where;
C'o = Primary compression ratio
p'o & eo = Effective overlay pressure & pore number in the ground
Delta p = Increase in total vertical stress
Delta e = change in pore count for voltage (stress?) increase Delta p
The only values known to be are z/B ratio & L/B ratio.
Any help is very much appreciated!
I'm looking for some guidance on the chart by Janbu, Bjerrum & Kjaernsli which shows the increase in vertical stress for flexible footing for various z/B ratio against L/B ratio.
I would like to re-create the equation to calculate the value shown on the chart, this is where i require some guidance. I have found little literature on the subject which fully explains the basis of the chart.
The original report gives the formula on the attached picture and I have translated the terms where;
C'o = Primary compression ratio
p'o & eo = Effective overlay pressure & pore number in the ground
Delta p = Increase in total vertical stress
Delta e = change in pore count for voltage (stress?) increase Delta p
The only values known to be are z/B ratio & L/B ratio.
Any help is very much appreciated!
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RE: Increase in vertical stress for flexible footing by Janbu, Bjerrum & Kjaernsli
Or check out: http://research.engr.oregonstate.edu/usucger/PandD...
RE: Increase in vertical stress for flexible footing by Janbu, Bjerrum & Kjaernsli
Thankyou ever so much for your input and very useful reference.
Unless I've missed it it appears that the literature omits the `Janbu chart formula. Newarks work is covered in chapter 3 however which is similar but I don't think that is quite what I'm looking for.
Thanks!