Analytic method of pile displacement in long-short pile group subjected to vertical loading

Function with two undetermined coefficients was applied to characterize shear force along the piles in long-short pile group.Based on displacement compatibility relation,stress and strain equation and force equilibrium relationship of pile,the stiffness matrix relating force to displacement of pile top was deduced.This matrix could be used to analyze both displacement and shear force along the depth of piles in long-short pile group without discretization of the soil or piles.It was shown by comparison with boundary element method and finite element method that this method was feasible.