Non-linear seismic response of a concrete gravity dam is investigated to determine the effects of construction joints. A non-linear finite element model is presented to capture seismic behaviour of the horizontal construction joints. The non-linear seismic analysis is conducted under the effect of the horizontal construction joints as well as dam-reservoir interaction. The dam-reservoir interaction effects were considered using staggered method. The analysis is applied to the case of a gravity dam with infinite reservoir under the horizontal earthquake ground motion. It was found that the horizontal construction joint could change the seismic response of the dam.
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