A MECHANIC BASED MODEL FOR DEFINITION OF SEISMIC RISK AND REAL TIME DAMAGE SCENARIO OF BUILDINGS

Abstract eng:
SP-BELA (Simplified Pushover Based Earthquake Loss Assessment) is a mechanic based fragility methodology adopted in large scale vulnerability assessment for the definition of seismic risk and damage scenario. The method has been developed for RC cast in place [1], RC pre cast [2] and low vulnerability masonry buildings [3]. SP-BELA identifies numerically the damage limit states by checking deformation and stress limit conditions on the structural elements of buildings. The capability of SP-BELA methodology to represent the seismic performance of Italian buildings has been improved through a calibration process recently completed. By using data collected from observed damage in the earthquakes occurred in Italy from 1976 (earthquake of Friuli) to 2009 (L'Aquila earthquake), calibration coefficients have been computed. They have been adopted in order to define fragility curves for five damage levels (those of EMS98 scale, [4]) and for five vulnerability classes. SP-BELA has been adopted to define seismic risk and damage scenario of Italian residential and school buildings. In order to provide a user friendly tool to support decision makers during emergency management, a platform with GIS functionality has been developed. When an earthquake occurs, the WebGIS platform can evaluate real time damage scenario and seismic risk maps. The platform allows to input data of an occurred earthquake. The tool allows to define ground shaking scenario in terms of magnitude, epicentre position, depth, fault mechanism and attenuation relationship. The fault can be defined by starting from an Italian database, the DISS database (Database of Individual Seismogenic Sources [5]) of INGV (National Institute of Geophysics and Volcanology). Alternatively, a new user digitalized fault can be input. The platform allows also the evaluation of real-time damage scenarios with ShakeMap. Finally, it enables to visualize in tables and maps the seismic risk calculated for different return period and time windows. This paper describes the adoption of SP-BELA methodology for the definition of seismic risk and real time damage scenario of Italian residential and school buildings.

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