Seismic risk

ABSTRACT This paper presents numerical techniques for computing the response of reinforced concretes structures. From the one degree of freedom case and after the formulation of the equations of dynamic equilibrium, the general case is considered. Two main aspects are treated, the one related to the modal analysis which, in the linear regime, leads to the mode shapes and the natural frequencies, and the one related to the seismic vulnerability analysis which, in the non linear regime, is able to describe the damage location and the critical zones of a given structure. Applications show that the strategy opens on tools useful to design the reinforcement of existing building.