Computing allowable load from an SPT N value
Computing allowable load from an SPT N value
(OP)
To meet an inspection requirement for a deck footing, I need to convert an SPT N value to lbs/sqft to calculate the numebr and area of footings I need on some marginal soils. Is there a simple formula to compute SPT N values to allowable load /sq ft for the footings?





RE: Computing allowable load from an SPT N value
RE: Computing allowable load from an SPT N value
Check Chapter 9 Foundations in "Soil Mechanics in Engineering Practice", Third Edition by Terzaghi, Peck and Mesri and you will find the light. This should be sufficient for your purposes
RE: Computing allowable load from an SPT N value
RE: Computing allowable load from an SPT N value
This may be available on-line from the Corps.
RE: Computing allowable load from an SPT N value
Focht3..yup. I'll remember to do an extra 12oz. curl to you.
RE: Computing allowable load from an SPT N value
RE: Computing allowable load from an SPT N value
Personally, I'd like to see everyone use CPT for all property determination and push some shelby tubes in auger holes for identification and lab testing.
RE: Computing allowable load from an SPT N value
Please explain your comment that the "USACE manual doesn't add anything here."