Earthquake performance assessment of concrete gravity dams subjected to spatially varying seismic ground motions

Abstract

AbstractThis paper investigates the earthquake performance of concrete gravity dams under spatially variable seismic excitations. A nonlinear finite element model is developed and validated using shake table experimental results. The model is then subjected to spatially varying earthquake ground motions incorporating the wave passage effect, with values for apparent propagation velocities consistent with the source-site geometry and the shear wave velocity in the foundation rock. The evaluation reveals that different response patterns occur when spatially non-uniform and uniform seismic ground motions are applied as input excitations to the model, because spatially non-uniform excitations induce the quasi-static response, whereas uniform excitations do not, and, in addition, the dynamic response caused by different input motions varies. Notably, spatially non-uniform excitations produce larger opening at the heel of the dam and severer slipping at its toe; this latter observation can have a significant effect on the global equilibrium and stability of the dam during an earthquake.Keywords:: spatially varying seismic ground motionsdam–reservoir–sediment–foundation interactionnonlinear finite element analysisconcrete gravity damsjointed rockView correction statement:Corrigendum AcknowledgementsThe author would like to thank the anonymous reviewers for their insightful comments, which have improved the quality of this work.FundingThis work was funded by Drexel University and the US National Science Foundation under awards CMMI-0600262 and CMMI-0647860. The financial support is gratefully acknowledged.NotesThis article was originally published with errors. This version has been corrected. Please see Corrigendum (http://dx.doi.org/10.1080/15732479.2013.879323).