Importance of Bridge-Specific Fragility Curves in the Seismic Assessment of Roadway Networks


Abstract eng:
In general, bridges within a road network have different geometries, structural systems and member properties, mainly due to differences in the site topography and the construction method selected; therefore, the use of the same seismic fragility functions for all bridges of a certain class, neglecting the specific characteristics of their key components and of the seismic demand (that also varies with the site) is in principle inconsistent, albeit commonly done in loss assessment projects. To gain more insight into this, this paper focuses on the application of a recently proposed methodology for the derivation of bridge-specific fragility curves to all different bridge categories within an actual road network, hence revealing the importance of the bridge-specific approach in assessing a bridge inventory. Capacity and demand are explicitly defined at a component level for all different bridges and bridge categories of the studied road network, using advanced analysis tools (ad-hoc developed software), while uncertainties in capacity, demand and limit state definition are accounted for, based on the results of inelastic pushover and response history analyses. Using this approach, fragility curves for different limit states are derived at both the component and system level, for all bridges of the road network studied, while the consistency of adopting ‘representative’ fragility curves for all bridges belonging to the same category is also investigated. To this purpose, fragility curves for all bridges of two specific categories are presented, hence identifying the range within which the damage thresholds vary for a given typological class, whereas the effect of different geometric properties and bridge class on seismic fragility is also investigated.

Contributors:
Conference Title:
Conference Title:
16th World Conference on Earthquake Engineering
Conference Venue:
Santiago (CL)
Conference Dates:
2017-01-09 / 2017-01-13
Rights:
Text je chráněný podle autorského zákona č. 121/2000 Sb.



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 Record created 2017-01-18, last modified 2017-01-18


Original version of the author's contribution as presented on USB, paper 3521.:
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