Abstract
The settlement at the dam crest induced by earthquake loading is an important design parameter widely used to evaluate the seismic performance of dams. Two-dimensional nonlinear dynamic analyses were performed to calculate the dam crest settlement of earth core rockfill dams (ECRDs). The numerical model was first validated against centrifuge test measurements. Comparisons showed that the numerical model provided reasonable estimates of the measured response. A series of dynamic numerical analyses were performed for a wide range of ground motions. The calculated settlements were revealed to compare well with field recordings of dam crest settlements. The settlements were also plotted against ground motion parameters, including free-field surface peak ground acceleration (PGA), peak ground velocity (PGV), Arias intensity (Ia), and moment magnitude (M). Predictive equations for the crest settlement were also presented. It wes demonstrated that PGA provided a good estimate of the settlement, but Ia provided the most favorable fit according to the calculations. Additionally, multiple parameters models were also presented to enhance the accuracy of the predictions.
Highlights
The settlement at the dam crest induced by seismic excitation is an important seismic design parameter for earth dams and is routinely used to evaluate the seismically-induced damage level of dams
The numerical model was validated against centrifuge test recordings
The nonlinear model of the dam was demonstrated to provide reliable estimate of the seismic response of earth core rockfill dams (ECRDs) when compared with the centrifuge test measurements
Summary
The settlement at the dam crest induced by seismic excitation is an important seismic design parameter for earth dams and is routinely used to evaluate the seismically-induced damage level of dams. A series of numerical simulations was performed to evaluate the dynamic response of earth dams. Yang and Chi [2] performed a series of finite element limit analyses to evaluate the seismic stability of earth core rockfill dams (ECRDs). Pang et al [3] performed numerical simulations to calculate the settlement of concrete-faced rockfill dams (CFRD) and to derive fragility curves. Zhang et al [4] performed dynamic analyses to investigate the stress induced in the concrete slab of CFRDs. neither of the numerical models were. The predictive equation could potentially be used for damage assessment core rockfill dams (ECRDs). Multivariate regression regression analyses analyses were were performed performed to to correlate correlate perform the calculated crest settlements with a number of ground motion parameters.
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