The book introduces a numerical solution, based on Differential Quadrature Method (DQM), to solve the buckling problem of delaminated cylindrical shells and buckling problem of prismatic and non-prismatic columns. Book introduces a new treatment for buckling problem of delaminated shells, which enables one to consider different buckling shapes along the shell axis and around shell axis. Book will also emphasis the powerful and easiness of the differential quadrature method through solving the non-linear buckling problem of delaminated cylindrical shells and buckling problem of non-prismatic columns.