Summary This study investigated the seismic performance and soil‐structure interaction of a scoured bridge models with pile foundation by shaking table tests using a biaxial laminar shear box. The bridge pier model with pile foundation comprised a lumped mass representing the superstructure, a steel pier, and a footing supported by a single aluminum pile within dry silica sand. End of the pile was fixed at the bottom of the shear box to simulate the scenario that the pile was embedded in a firm stratum of rock. The bridge pier model was subjected to one‐directional shakes, including white noise and earthquake records. The performance of the bridge pier model with pile foundation was discussed for different scoured conditions. It is found that the moment demand of pile increases with the increase of scoured depth whereas the moment demand of the bridge pier decreases, and this transition may induce the bridge failure mechanism transform from pier to pile. The seismic demand on scoured pile foundations may be underestimated and misinterpreted to a certain degree. When evaluating the system damping ratio with SSI, the system response may not be significantly changed even if the soil viscous damping contribution is varied. Copyright © 2014 John Wiley & Sons, Ltd.
<p>This study investigated the seismic performance and soil-structure interaction of scoured bridge pier models with pile foundations by shaking table tests and finite element simulations. The model bridge pier with a pile foundation comprised of a lumped mass representing the superstructure, a steel pier, and a footing supported by a single aluminium pile within dry silica sand. The performance of the structure was discussed for different scoured conditions. Tt is found that the transition of moment demand from pier to pile with increasing exposed length may cause the bridge to failure. A three-dimensional finite element model of the shaking table test was created using the ANSYS program. The soil dynamic property was taken into consideration for the nonlinearity of the soil-pile interface, and an equivalent linear model was used for the soil behaviour. The computational model was validated by the data obtained from the shaking table tests.</p>
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