Friction coefficient in foundation design

[Anonymous]

Hello

I’m designing a foundation under a steel column and have a question regarding sliding.

Calculations according to EN 1997-1 and EN 1992-1-1

In the soil parameters I can assign friction coefficient (ex 0,6). But in the calculation of sliding the given value isn’t used directly. Instead Robot uses:

Tan(δd)=0,3

What’s the relation between these coefficients? I can’t find anything in the help files.

See attached pdf.

[Artur.Kosakowski · Accepted solution]

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[Anonymous]

I had the smooth precast box ticked, which it shouldn’t be in this case. Now it adds up just right.

Thank you!