SEISMIC EVALUATION OF CONCRETE DAMS VIA CONTINUUM DAMAGE MODELS

In this paper a general methodology for the analysis of large concrete dams subjected to seismic excitation is outlined. It is valid both fo r gravity dams (2D representation) and arch dams (3D representation). The method allows for non-linear material behaviour of the dam,'transp arent fictitious boundaries' for dealing properly with in-coming and o ut-going seismic waves, and an efficient procedure to deal with dam-so il-fluid interaction. The mechanical behaviour of concrete is modelled using an isotropic damage model which allows for tension and compress ion damage, and exhibits stiffness recovery upon load reversals. Empha sis is placed in the treatment of fluid-structure interaction, regardi ng both formulation and efficiency aspects. A gravity dam and an arch dam are analysed subjected to artificially generated earthquakes of di fferent intensities, and the results are used to study the degree of ( un)safety of the dams.