Check for sliding (pad and strip base:EC2)

Tekla Structural Designer
2021
Tekla Structural Designer

Check for sliding (pad and strip base:EC2)

The check for sliding is carried out for pad foundations only.

If there is no horizontal force acting on foundation check for sliding is not required.

Sliding resistance (EC7 Section 6.5.3) - forces are defined from STR combinations.

Horizontal Forces on foundation for each direction:

Fdx = F x,sup
Fdy = F y,sup

where

Fx,sup = factored horizontal force acting on support in X-dir. (from analysis)
Fy,sup = factored horizontal force acting on support in Y-dir. (from analysis)

Horizontal force on foundation:

Hd = [abs(Fdx)2 + abs(Fdy)2]0.5

Sliding resistance verification (Section 6.5.3)

Sliding resistance (exp.6.3b and table A.5):

RH.d = [FzG,d + γGf * Fswt] * tan(δk) / γR.h

where

δ k = factored horizontal force acting on support in X-dir.
γ R.h = 1.1 (set R2) EC7 recomm. and for Irish and Malaysian NA
γ R.h = 1.0 (set R1) for UK, Singapore NA
γ Gf = 1.0 (permanent favorable action)
F zG,d = Vertical load acting on support in STR/GEO limit states where favorable actions considered.
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