Output-only structural identification of the engineering faculty edifice a at L'Aquila

In the present paper the results obtained from a campaign of ambient vibration acceleration measurements conducted on the damaged Engineering Faculty Edifice A of the University of L’Aquila are reported. Through the collected data, the modal parameters of the structure are identified by two output-only procedures. Based on design drawings and destructive material testing, finite element models have been realized for all the substructures composing the building. Damage observation and measured responses have been used to search through engineering judgement a reasonable agreement between the identified modal models and the spectral properties of finite element models. The reduced confidence on the main dynamic characteristics of the structural system has supported the design of a dissipative interconnections of adjacent substructures to enhance the overall seismic structural behaviour.