Pile Group with Vertical Piles

Using the notation in Fig. 19, which shows a group of vertical piles with a rigid pile gap with an imposed vertical eccentric load, the location of the pile group centroid is

Figure 19: Pile group with vertical piles and vertical load

The axial force on each pile in row i, neglecting the self-weight of the pile and the pile cap, is given by

For a symmetrical group, the location of the group centroid is

When the applied load coincides with the pile group centroid, the axial force on each pile is given by

When the pile cap is subjected to a bending moment, M, the eccentricity is given by

When each row in the group has an identical number of piles n _R and the number of piles in each line is n _L, the load applicable to each line is

The axial force on a pile in row i is

Figure 20 illustrates a group of vertical piles subjected to a horizontal load, as in the case of a pier or wharf. the piles are considered fixed-ended at the pile cap and at a depth of penetration, H, below the bottom of the rigid pile cap, with a point of contraflexure occurring at a depth of H/2. The total moment acting on the pile group is

Figure 20: Vertical piles with vertical and horizontal loads

The axial force on each pile in row i