The Seismic Risk Of The Lifeline In Small
Communes: The Cross-correlation Effects
Author(s)
C. Vardanega, A. Raffetti & G. Valfrè
Abstract
A significant part of the consequences of a severe earthquake in an urban area is
related to the failure of the lifeline system. A systematic assessment of seismic
risk, vulnerability, and criticality of lifelines in small communities (considering
them both separately and from a systemic point of view) is performed. The risk
is characterized by using functions related to the components of different
lifelines. The approach allows the optimization of the use of economic limited
resources in intervention to reduce risk. Given a set of remedial measures more
expensive than the limited budget, the subset maximizing the risk reduction at
the appropriate cost is selected. The developed methodology allows one to
analyse the lifeline system characterized by the information related to
vulnerability and to their functional model separately and as a whole. The
definition of different reference earthquakes is also allowed. The information
related to the vulnerability of the elements and to the seism is defined by means
of probabilistic models. The present paper is organized as follows. After a brief
introduction to the seismic risk associated to a system of lifelines, a synthetic
description of the whole methodology adopted is given. In the second part of the
paper the methodology developed to assess the risk due to cross-correlations
effects between lifelines is described in detail. The problem is assessed from
both structural and functional points of view. Results of the application of the
whole methodology to test sites are also reported. This work is one of the
outcomes of the activities promoted and directed by the Istituto Nazionale di
Geofisica e Vulcanologia of Rome within the Programma Operativo di Ricerca
per la Sismologia e l’Ingegneria Sismica (PRO.S.I.S.), aimed at assessing
methods and instrumentations for the reduction of the seismic risk in Italy.
Keywords: lifeline, seismic risk, cross-correlation, probabilistic approach.
Keywords
lifeline, seismic risk, cross-correlation, probabilistic approach.
Related Book
Other papers in this volume
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