EI 02C097
01 Jul 97
Table 2-2
Performance and Eccentricity Factors (Barker et al. 1991) (Copyright permission, National Cooperative Highway Research Program)
Type of Pile
Performance Factor,
Eccentricity Factor, Fe
pf
Prestressed concrete
Spiral columns: 0.75
Spiral columns: 0.85
Tied columns: 0.70
Tied columns: 0.80
Precast concrete
Spiral columns: 0.75
Spiral columns: 0.85
Tied columns: 0.70
Tied columns: 0.80
Steel H-piles
0.85
0.78
Steel pipe
0.85
0.87
Timber
1.20*
0.82
Drilled shafts
Spiral columns: 0.75
Spiral columns: 0.85
Tied columns: 0.70
Tied columns: 0.80
Note:
is greater than unity for timber piles because the average load factor for vertical loads is greater than the FS.
pf
Figure 2-1. Eccentric load on a pile group
2-3
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