Title:
Next generation seismic fragility curves for california bridges incorporating the evolution in seismic design philosophy

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dc.contributor.advisor DesRoches, Reginald
dc.contributor.advisor Padgett, Jamie E.
dc.contributor.author Ramanathan, Karthik Narayan en_US
dc.contributor.committeeMember Ellingwood, Bruce
dc.contributor.committeeMember Goodman, Seymour
dc.contributor.committeeMember Goodno, Barry
dc.contributor.committeeMember Kahn, Lawrence F.
dc.contributor.department Civil and Environmental Engineering en_US
dc.date.accessioned 2012-09-20T18:23:26Z
dc.date.available 2012-09-20T18:23:26Z
dc.date.issued 2012-07-02 en_US
dc.description Errata added at request of advisor and approved by Graduate Office, March 15 2016.
dc.description.abstract Quantitative and qualitative assessment of the seismic risk to highway bridges is crucial in pre-earthquake planning, and post-earthquake response of transportation systems. Such assessments provide valuable knowledge about a number of principal effects of earthquakes such as traffic disruption of the overall highway system, impact on the regions' economy and post-earthquake response and recovery, and more recently serve as measures to quantify resilience. Unlike previous work, this study captures unique bridge design attributes specific to California bridge classes along with their evolution over three significant design eras, separated by the historic 1971 San Fernando and 1989 Loma Prieta earthquakes (these events affected changes in bridge seismic design philosophy). This research developed next-generation fragility curves for four multispan concrete bridge classes by synthesizing new knowledge and emerging modeling capabilities, and by closely coordinating new and ongoing national research initiatives with expertise from bridge designers. A multi-phase framework was developed for generating fragility curves, which provides decision makers with essential tools for emergency response, design, planning, policy support, and maximizing investments in bridge retrofit. This framework encompasses generational changes in bridge design and construction details. Parameterized high-fidelity three-dimensional nonlinear analytical models are developed for the portfolios of bridge classes within different design eras. These models incorporate a wide range of geometric and material uncertainties, and their responses are characterized under seismic loadings. Fragility curves were then developed considering the vulnerability of multiple components and thereby help to quantify the performance of highway bridge networks and to study the impact of seismic design principles on the performance within a bridge class. This not only leads to the development of fragility relations that are unique and better suited for bridges in California, but also leads to the creation of better bridge classes and sub-bins that have more consistent performance characteristics than those currently provided by the National Bridge Inventory. Another important feature of this research is associated with the development of damage state definitions and grouping of bridge components in a way that they have similar consequences in terms of repair and traffic implications following a seismic event. These definitions are in alignment with the California Department of Transportation's design and operational experience, thereby enabling better performance assessment, emergency response, and management in the aftermath of a seismic event. The fragility curves developed as a part of this research will be employed in ShakeCast, a web-based post-earthquake situational awareness application that automatically retrieves earthquake shaking data and generates potential damage assessment notifications for emergency managers and responders. en_US
dc.description.degree PhD en_US
dc.identifier.uri http://hdl.handle.net/1853/44883
dc.publisher Georgia Institute of Technology en_US
dc.subject Reliability en_US
dc.subject Nonlinear time history analyses en_US
dc.subject Seismic design philosophy en_US
dc.subject Fragility curves en_US
dc.subject Bridges en_US
dc.subject Finite element analyses en_US
dc.subject.lcsh Earthquake resistant design
dc.subject.lcsh Earthquake engineering
dc.subject.lcsh Earthquake engineering Research
dc.subject.lcsh Bridges Design and construction
dc.subject.lcsh Bridges Earthquake effects
dc.title Next generation seismic fragility curves for california bridges incorporating the evolution in seismic design philosophy en_US
dc.type Text
dc.type.genre Dissertation
dspace.entity.type Publication
local.contributor.corporatename School of Civil and Environmental Engineering
local.contributor.corporatename College of Engineering
relation.isOrgUnitOfPublication 88639fad-d3ae-4867-9e7a-7c9e6d2ecc7c
relation.isOrgUnitOfPublication 7c022d60-21d5-497c-b552-95e489a06569
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