A group of total 16 piles are arranged in a square grid format. The center-to-center spacing (s) between adjacent piles is 3 m. The diameter (d) and length of embedment of each pile are 1 m and 20 m, respectively. The design capacity of each pile is 1000 kN in the vertical downward direction. The pile group efficiency (η_g) is given by where m and n are number of rows and columns in the plan grid of pile arrangement, and θ=tan^-1(d/s).
The design value of the pile group capacity (in kN) in the vertical downward direction is (round off to the nearest integer)