关键词: 砂浆劣化, 浆砌石拱坝, 抗震安全, 振型分解反应谱法

Abstract: A masonry double-curvature arch dam in eastern China is taken as study object, considering the effect of freeze-thaw cycles on mortar deterioration, the finite element model of the arch dam is es ⁃ tablished by using ABAQUS, and the impact of mortar deterioration on the seismic safety is analyzed. The calculation results show that the deformation and stress of the dam body under seismic condition still meet the specification requirements under current deterioration degree. However, with the continu ⁃ ous increase of operation time, the displacement component and the maximum tensile stress of dam body will continue to increase, and there is a risk of tensile damage. The junction between dam abutment and mountains on both banks is the weakest part, which should be taken seriously in the seismic design of dam. The study results can provide reference for seismic safety analysis of similar projects.

Key words: mortar deterioration, masonry arch dam, seismic safety, mode-superposition response spec ? trum method