초록 close

A dynamic elastic local buckling analysis is presented for a pile subjected to an axial impactload. The pile is assumed to be geometrically perfect. The interactions between the pile and thesurrounding soil are taken into account. The interactions include the normal pressure and skin friction onthe surface of the pile due to the resistance of the soil. The analysis also includes the influence of thepropagation of stress waves through the length of the pile to the distance at which buckling is initiatedand the mas of the pile. A perturbation technique is used to determine the critical buckling length andthe associated critical time. As a special case, the explicit expression for the buckling length of a pile isobtained without considering soil resistance and compared with the one obtained for a column by meansof an alternative method. Numerical results obtained show good agreement with the experimental results.The effects of the normal pressure and the skin friction due to the surrounding soil, self-weight, stiffnessand geometric dimension of the cross section the critical buckling length are discussed. The suddenchange of buckling modes is further considered to show the nap-through phenomenon occurring as aresult of stres wave propagation.