Seismic Safety Evaluation of High Concrete Dams Part I: State of the Art Design and Research

Abstract eng:
Key issues for seismic safety evaluation of high concrete dams are reviewed: In Part I, for the pre-feasibility study stage, the conventional seismic design practice is summarized under the framework of the Chinese Specification for Seismic Design of Hydraulic Structures; for the stage of preliminary and final design, some advanced design and research are performed for further seismic safety evaluation of high concrete dams, mainly arch type exceeding 150m high with a large index of reservoir and power capacity. These include consideration of (1) Effects of earthquake input mechanism and radiation damping due to infinite canyon; (2) Effects of nonlinearity of contraction joint opening; (3) Effects of damage and fracture behaviors in dams and strengthening; (4) Effects of dam-reservoir interaction; (5) Earthquake stability of arch dam-abutment system. Procedures for considering the above factors are outlined. In Part II, engineering applications to high arch dams with a case study on the Dagangshan Arch Dam to resist the design earthquake are demonstrated and some concluding remarks are given.

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