In seismic countries, the managing authorities of road networks rely on risk assessment of bridges to decide retrofit intervention priorities on a regional scale. It is a current practice to assess seismic vulnerability in the form of fragility curves. The most extensively used tool currently available for the evaluation of vulnerability curves of large-scale systems is the Hazus methodology, which provides fragility curves for whole classes of structures, but shows deficiencies when applied to a community–specific database, where different typologies are represented. Given the large number of bridges in a regional scale road network, fragility curves have to be obtained by means of simplified and reliable numerical methods, time-history analyses being to date still very expensive in computational terms when applied in a probabilistic framework. In the last decade displacement-based (DB) methods have become increasingly established simplified assessment procedures. Present work reports on an extensive risk assessment study carried out on Northern-Italy’s Region of Veneto road system; the analysis focuses on one of the most typical bridge types of the network, multi-span RC bridges. Analytical fragility curves obtained with displacement-based approaches are proved to be sufficiently accurate. The curves obtained can be used as a reference for Italian and European RC multi-span concrete bridges.

Analisi di rischio a larga scala di ponti multicampata in c.a. con metodi agli spostamenti

Longo, Francesco;Donà, Marco;
2013-01-01

Abstract

In seismic countries, the managing authorities of road networks rely on risk assessment of bridges to decide retrofit intervention priorities on a regional scale. It is a current practice to assess seismic vulnerability in the form of fragility curves. The most extensively used tool currently available for the evaluation of vulnerability curves of large-scale systems is the Hazus methodology, which provides fragility curves for whole classes of structures, but shows deficiencies when applied to a community–specific database, where different typologies are represented. Given the large number of bridges in a regional scale road network, fragility curves have to be obtained by means of simplified and reliable numerical methods, time-history analyses being to date still very expensive in computational terms when applied in a probabilistic framework. In the last decade displacement-based (DB) methods have become increasingly established simplified assessment procedures. Present work reports on an extensive risk assessment study carried out on Northern-Italy’s Region of Veneto road system; the analysis focuses on one of the most typical bridge types of the network, multi-span RC bridges. Analytical fragility curves obtained with displacement-based approaches are proved to be sufficiently accurate. The curves obtained can be used as a reference for Italian and European RC multi-span concrete bridges.
2013
XV Convegno ANIDIS: L'ingegneria Sismica in Italia
Padova
Padova University Press
G., Tecchio; Longo, Francesco; Donà, Marco; S., Scapinello; C., Modena
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11572/33674
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