STRUCTURAL STABILITY MODELS FOR CULTURAL HERITAGE
Europe implement policies in an effort to preserve their cultural heritage, a very important part of their national history and an integral part of European tradition. A major objective of the STABLE project is to address earthquake risk maps of cultural heritage sites through the development of vulnerability assessment.
Keyword: Cultural Heritage, European project, Structural stability
In STABLE (STructural stABiLity risk assEssment – Grant Agreement No: 823966) one of the goals is to summarize the various methods used for the vulnerability assessment and conclude with the required parameters that need to be collected from each structure of the chosen case studies.
The consortium members working on the vulnerability assessment that will be performed with the implementation of a simplified method such as the macroseismic method while at the same time, for a selection of buildings, it will be performed following a more elaborate method such as the analytical, which requires the simulation of 3D models in a finite element software.
The damage potential of buildings subjected to earthquakes can be represented by a series of curves, namely the fragility curves, which provide the probability of reaching or exceeding a given damage level as a function of the intensity of the earthquake. The information coming from the fragility curves and the implementation of statistics can produce the vulnerability curves.
Exploiting the experience from recent earthquakes have provided more data that have been useful in developing models to better assess the performance of structures in order to estimate the economic losses to structures and lifelines and the social consequences such as casualties and needs for provisional accommodation.
In STABLE the case studies are analyzed with various methods (depending on the objective of the assessment but also on the availability of data and technology), investigating the vulnerability of the built environment with the hazard scenarios as the first fundamental step in the seismic risk mitigation process.
The expected risk is determined according to the following expression: Risk = Hazard × Vulnerability, where:
- Hazard: as defined for the seismicity of the region and the accepted probability of exceedance,
- Vulnerability: as expressed by the defined capacity of the structure as described in the following.
The estimation of damage probability will be performed by means of a simplified mechanical methodology, based on this input parameters:
- Geometrical data (total height, number of storeys, perimeter, footprint area, average bearing wall thickness for masonry structures, Plan view at least of the ground-floor, etc)
- Use (residential, commercial, etc.),
- Year of construction and the relevant specification.
Article by: Matteo Serpetti