The analysis of the dynamic response of a monolithic stone column or of similar structures to seismic excitation is a very complex problem. For this reason, an extensive scientific literature has been produced on this argument, after the pioneering paper of Housner. Most of the works above have investigated only the stability with respect to the rocking. Perhaps, this is a consequence of the assumption generally made that the structure is monolithic and slender; therefore, the slidings between the block and the ground surface have been neglected. In former works (Sinopoli 1987, Sinopoli 1989), the author has demonstrated that the impact is a focal point in the dynamic evolution of a rigid structure simply supported on a rigid ground. In fact, depending on the geometrical features of the structure, the impact is responsible of the coupling between rockings and slidings. Therefore, a new question arises: are the slidings responsible of a failure due to the loss of the geometrical configuration or they make a multiblock column more stable by means of the dissipation mechanism? The aim of this paper is to investigate the dynamic behaviour of a multiblock column excited by a given ground motion, taking into account the results given by the impact problem.