tPartial factors for accidental design situations are 1.0

Verification of strength for pile foundations (DA2)


Characteristic actions Fk

Representative actions Frao

Design actions F„

yF A1

Design effect of actions Ed weight densities

Geometrical parameters Nominal dimensions

Material properties Characteristic material properties Xk rtjur i test jits 7


Ym 1

Design dimensions ad

Calculation model

Characteristic resistance Rk


Design resistance R^


Test results Test results

Measured resistances Rm mean minimum

Lower resistance

13.7.4 Design Approach 3

As discussed in Chapter 6, the philosophy of Design Approach 3 is to check reliability by applying partial factors to actions and to material properties (when used), while resistances are left unfactored. This philosophy remains unchanged when used in the design of pile foundations.

Design Approach 3 employs factors from Sets A1 or A2 (on structural and geotechnical actions respectively), M2, and R3, as illustrated in Figure 13.12. The factors in Set R3 are all 1.0 (except those applied to tensile pile resistance) and hence resistance is mostly unfactored. Tolerances, Aa, are not routinely applied to dimensions and the model factor YRd is usually not needed.

Numerical values of the partial factors for Design Approach 3 are:

Design Approach 3

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