Analysis of the Relationship Between Empirical Damages and Repair Costs on RC Private Buildings After L'Aquila Earthquake

Abstract eng:
In the first phase of the emergency management after the April 6, 2009, L’Aquila earthquake, field inspections were carried out through the AeDES form, a first level survey form for post-earthquake damage and usability assessment, to evaluate the usability conditions of buildings. Once the damage and usability assessment was completed, several Ordinances of the Prime Minister were issued to regulate the procedures and the public grant for the reconstruction of private buildings outside the historical centre of L’Aquila and surrounding municipalities. The public grant was released according to funding requests made by practitioners and checked by a proper commission entrusted by the Government. The data collected on a set of about 1,500 private Reinforced Concrete (RC) buildings in terms of usability rating, construction age, number of storeys, empirical damage, as well as of Actual Repair Costs (ARCs) are herein discussed and presented. Building Damage Grades (DG) defined according to the European Macroseismic Scale EMS-98 have been computed based on the damage data collected with the AeDES forms. Then, the relation between DG and ARCs, computed according to practitioners funding requests, is evaluated and discussed. A reasonable relationship between DG and ARCs is found if damage on non-structural components is taken into account. However, the study points out that the DG, defined as a function of the maximum damage detected on a structural or non-structural components, are not fully suitable to define a reliable correlation with ARCs. To this end, a more refined damage factor accounting for the damage extent on each structural and non-structural component and for the weight of the damage on a single component on the total repair costs of the building is needed.

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