## R

v102 y

Design is unacceptable if degree of utilization is > 100%

Design Approach 2

Actions and effects

Characteristic total action same as Design Approach 1 Partial factors from set A1: yq = 1-35 and yq = 1-5

Design total action per pile is Fcd = Yg Fsk + Yq Fq^ = 1110 kN© Characteristic resistance

Characteristic resistance is same as Design Approach 1 Design resistance

Partial factors from set R2: Yt = 1-1

Design resistance is Rcd =-= 1000 kN

Verification of compression resistance Design values Fcd = 1110 kN and Rcd = 1000 kN

Degree of utilization

Design is unacceptable if degree of utilization is > 100%

Design Approach 3 Cannot use Design Approach 3 for pile design with pile driving formulae

### Design to UK National Annex to BS EN 1997-1

The UK National Annex changes both the resistance factors and the correlation factors that must be used to verify pile resistance. All other factors remain unchanged from their EN values.

Measured resistance

Measured resistance is unchanged from previous calculation

Degree of utilization

Design is unacceptable if degree of utilization is > 100%

Characteristic resistance

Correlation factor on mean measured resistance Ç5 = 1.57 ©

Correlation factor on minimum measured resistance ^ = 1.44 ©

These values must be increased by a model factor YRd = 1.2 when using a pile driving formula without measurement of quasi-elastic pile head displacement during the impact. Thus Ç5 = Ç5 x YRd = 1.88 and ^ = ^6 x YRd = 1.73

cm,mean

Based on mean measured resistance-= 995 kN

cm,min

Based on minimum measured resistance-= 1085 kN

Characteristic resistance is Rck = min

Design resistance

Partial factors from Sets

vR4 y R

Design resistance is Rcd --

Verification of compression resistance

Degree of utilization

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