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- W84210137 abstract "This paper investigates the impact of the bridge skew angle on the force-deformation characteristics of abutments and the seismic response of a two-span bridge subjected to seismic two-component ground motions with near-fault effects. Three-dimensional models of a two-span box girder bridge were developed incorporating 0, 25, 45 and 60-degree skew. The models included seat-type abutments with elastomeric bearing pads and shear keys, and a single-column bent on pilecaps. A hyperbolic force-displacement (HFD) relationship was used to model the interaction between abutments and the embankment soil. A nonlinear spring is used to model near-field effects in series with an elastic spring and a dashpot element to simulate far-field effects. Nonlinear time-history analyses were performed using nine two-component lateral input ground motions. The analyses show that the interaction between abutment and soil causes the overall seismic bridge behavior to become more complex with increasing bridge skew. Skewed bridges tend to rotate about the vertical axis during a seismic event. The superstructure rotation can cause excessive transverse movement at seat-type abutments that builds up mainly during the initial peak cycles of shaking and can result in unseating of the superstructure. Rotation of the deck is accompanied by pounding on the abutment backwall. The deck rotation is due to development of an non-uniform passive soil wedge behind the abutment wall that results is asymmetric soil reactions between the acute and obtuse corner of the wall. The width and capacity of the passive wedge depends on abutment (embankment) width, skew angle and ground motion characteristics. Seismic behavior of skewed bridges is also strongly influenced by the characteristics of the input ground motions. For three skew configurations, the magnitude of permanent rotation and lateral offset varied among the nine input motions with no discernible trend. This strongly suggests the bridges with significant skew should be analyzed using motions with two or three components and several earthquake records should be considered in order to capture the behavior of structure details such as bearing pads and shear keys that affect the overall bridge response." @default.
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- W84210137 date "2006-01-01" @default.
- W84210137 modified "2023-09-24" @default.
- W84210137 title "Nonlinear Seismic Soil-Abutment-Structure Interaction Analysis of Skewed Bridges" @default.
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