| The modeling and nonlinear FEM simulation analysis for arch dam designs is an important topic, especially for those arch dams to be built in locations of complex topographic and geological conditions. In this paper, brief summary and contrast for the analytical methods of arch dam were conducted, the visualization and parameterization of FEM, and its implementation were investigated, and the system based on ANSYS, for the simulation FEM analysis of arch dam was developed. And 3-D nonlinear FEM simulation analysis was then carried out for Niutoushan arch dam, which is located in ShouNing County, FuJian Province of China.The visualization theory and parameterization technique for FEM, and secondary developing technique for ANSYS were studied. The parameterization principle for FEM modeling of arch dam and the implementation technique were introduced. By fully using of the powerful graphic functions of AutoCAD and of the secondary developing techniques provided in ANSYS, such as UIDL, APDL etc, a FEM simulation analysis system of arch dam based on ANSYS was developed, by means of which arch dams on complex foundation can be modeled and analyzed conveniently.Basic theory of nonlinear FEM analysis and its realization in ANSYS were studied, three kinds of nonlinear structural behaviors, the basic equations of elastic and plastic problem and strength criterion commonly used were discussed. And the basic process of FEM simulation analysis in ANSYS was introduced in detail.Then, were discussed the methods of stability analysis including the stability criterion of arch dam and its abutment, with attention being focused on rigid limited equilibrium method and FEM and the comparison of their advantages and disadvantages.Finally, Niutoushan double-curvature arch dam was modeled and 3-D FEM simulation analysis was performed, so as to find out the integral safety factor and the stress and displacement patterns of dam and its foundation under different load combination.
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