Elastodynamic model for large-diameter end-bearing shafts

摘要: The dynamic response of large-diameter end-bearing cylindrical shafts is studied. First, the popular plane-strain model Novak reviewed and its limitations are discussed. An improved then developed which, while retaining simplicity original model, accounts for third dimension by considering normal shear stresses acting on upper lower faces a horizontal soil slice. These incorporated in analysis impleminting Vlasov-Leontiev approximation based integrating governing equations over thickness layer. It shown that this operation leads to set elastodynamic which similar those yet properly incorporate salient 3-D effects. Explicit closed-form solutions obtained : (i) reaction along shaft ; (ii) impedance (iii) displacement field (iv) interaction factors between neighboring shafts. Both vertical lateral oscillations analyzed single grouped Results presented terms dimensionless graphs highlight importance soil-foundation response. proposed avoids plane strain model.