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Seismic Vulnerability of Bridges Susceptible to Spatially Distributed Soil Liquefaction Hazards
Among the multiple highway structures such as box culverts, chambers, retaining walls and bridges, the latter are among the most critical components of modern transportation networks. Although these networks provide the foundation for vibrant economies, a lack of understanding persists about the role that individual bridges play in network performance when subjected to unforeseen natural hazards. This paper concentrates on bridge-soil system analyses and probabilistically investigates the complex behavior of multi-span continuous steel bridges (MSCS) typical of the central-eastern U.S. (CEUS) when exposed to earthquake-induced soil liquefaction. MSCS bridges are among the most vulnerable bridge classes owing to their bearing and abutment inability to accommodate excessive demands. Due to the large mass and relatively small bearing stiffnesses at the abutments, this bridge type experiences the largest deck displacements of all bridge types common to central-eastern U.S. Sophisticated bridge models developed in OpenSees -the computational platform of the Pacific Earthquake Engineering Research Center (PEER)- are coupled with liquefiable soil models. To account for the effects of soil-pile interaction on bridge response, nonlinear P-y springs sensitive to excess pore water pressure are embedded in the models. Uncertainties in bridge response propagating from soil liquefaction to structural performance of bridge systems are synthesized as parametric fragility functions. The developed fragility curves for complete damage show considerable amplifications on vulnerability of rocker bearings and piles. Moreover, depending on the soil profile, liquefaction decreases the fragility of bridge columns. These vulnerability assessments result in more accurate regional prioritization and maintenance programs that are useful to U.S. departments of transportation and related infrastructure agencies.
Seismic Vulnerability of Bridges Susceptible to Spatially Distributed Soil Liquefaction Hazards
Among the multiple highway structures such as box culverts, chambers, retaining walls and bridges, the latter are among the most critical components of modern transportation networks. Although these networks provide the foundation for vibrant economies, a lack of understanding persists about the role that individual bridges play in network performance when subjected to unforeseen natural hazards. This paper concentrates on bridge-soil system analyses and probabilistically investigates the complex behavior of multi-span continuous steel bridges (MSCS) typical of the central-eastern U.S. (CEUS) when exposed to earthquake-induced soil liquefaction. MSCS bridges are among the most vulnerable bridge classes owing to their bearing and abutment inability to accommodate excessive demands. Due to the large mass and relatively small bearing stiffnesses at the abutments, this bridge type experiences the largest deck displacements of all bridge types common to central-eastern U.S. Sophisticated bridge models developed in OpenSees -the computational platform of the Pacific Earthquake Engineering Research Center (PEER)- are coupled with liquefiable soil models. To account for the effects of soil-pile interaction on bridge response, nonlinear P-y springs sensitive to excess pore water pressure are embedded in the models. Uncertainties in bridge response propagating from soil liquefaction to structural performance of bridge systems are synthesized as parametric fragility functions. The developed fragility curves for complete damage show considerable amplifications on vulnerability of rocker bearings and piles. Moreover, depending on the soil profile, liquefaction decreases the fragility of bridge columns. These vulnerability assessments result in more accurate regional prioritization and maintenance programs that are useful to U.S. departments of transportation and related infrastructure agencies.
Seismic Vulnerability of Bridges Susceptible to Spatially Distributed Soil Liquefaction Hazards
Aygün, Bayram (author) / Dueñas-Osorio, Leonardo (author) / Padgett, Jamie E. (author) / DesRoches, Reginald (author)
Structures Congress 2009 ; 2009 ; Austin, Texas, United States
Structures Congress 2009 ; 1-10
2009-04-29
Conference paper
Electronic Resource
English
Seismic Vulnerability of Bridges Susceptible to Spatially Distributed Soil Liquefaction Hazards
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