Experimental results of a prestressed concrete beam are presented in this paper. Damage due to corrosion of the reinforcement was simulated by the progressive cut of the prestressing bars until 50% of it. The beam was tested under flexion exceeding the cracking load an, thus, concrete was also damaged. For each load step, natural frequencies and modes of vibration were measured. In based of these values, a correlation between changes in dynamic parameters and damage produced can be formulated.

On the other hand, a numerical computational analysis was performed so as to validate frequencies and modes of vibration registered for the original beam and to study the relation between structural damage and variation of dynamic parameters.