Earthquake fragility assessment of curved and skewed bridges in Mountain West region : research brief.
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2016-09-01
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Alternative Title:Project title : framework of performance-based earthquake design of curved and skewed bridges
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Abstract:the ISSUE
the RESEARCH
Earthquake Fragility
Assessment of Curved
and Skewed Bridges in
Mountain West Region
Reinforced concrete bridges with both skew and curvature are common in areas with complex terrains.
These bridges are irregular and complex geometric designs, and comprehensive seismic risk studies
are not always required. As a result, little knowledge is available about actual seismic risks for these
bridges in areas of low-to-moderate seismic activity.
Analytical fragility studies were carried out on four typical bridge designs with different geometric
configurations (i.e. straight, curved, skewed, skewed and curved) in the mountain west region of the
United States. The influences of skewed and curved geometric configurations on bridge component
seismic fragility were investigated by developing analytical fragility curves. A typical 3-span concrete
straight bridge located in Denver, CO, was selected as the prototype bridge, from which three bridge
models with complex geometric variations were modified. Based on the nonlinear FEM analysis results
of these bridge models, fragility analyses were carried out considering the uncertainties of the bridge
model and ground motions. Comparative studies also were conducted to investigate influences from
the geometric configurations.
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