Seismic behavior of urban systems
Galderisi, Adriana and Ceudech, Andrea (2005) Seismic behavior of urban systems. [Pubblicazione su rivista scientifica]
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Looking at the damages caused in different cities by earthquakes, it is possible to note that damage has many faces, changing from time to time starting from the earthquake instant. Nevertheless, most of the studies aimed at describing the damages determined by a seismic event, looking at the city as “sum” of elements (buildings and network infrastructures), have been focused on physical damages, occurring immediately after the event and on consequent loss of human lives. Very few studies, looking at the city as a whole, tried to highlight the multiple dimension of damage, focusing on all the different faces of urban damage (physical, functional, economic, social) and on the different periods of time they generally occur after the earthquake. With reference to these considerations and basing on the analysis of the earthquake phenomenology, this study aims at understanding how the city, considered as a complex system, responds to an earthquake. In detail, starting from the analogy between the behaviour of a complex system hit by an external stress and the city hit by an earthquake, the study outlines the “seismic behavior” of urban systems. The analysis of the “seismic behavior” of cities highlights the role of urban planning in the seismic risk mitigation, pointing out that the mitigation of seismic risk requires both structural interventions on the building stock and infrastructures, both actions facing the seismic problem in its “urban” dimension. Hence, the final goal of the research work is to define urban planning actions for improving the capacity of the city, interpreted as a whole, to respond to a seismic event or, in other words, to improve the “seismic behavior” of the city. With reference to this goal, the main objectives of this study can be synthesized as follows: - to set up a conceptual framework for analyzing the seismic behavior of a city; - to set up tools aimed at describing and forecasting the seismic behavior of a city.
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