Anti-Seismic Analytic Theories And Methods Of Concrete Arch Dam On Complicated Foundation

Anti-seismic analysis of concrete arch dam is significant content of arch dam's safety estimate. In this paper, the theories of the structure dynamical analysis, the analytic theories of fluid-solid coupling and the local artificial boundary are researched. Based on these theories and using the APDL language, the parametric design language of ANSYS, the hydrodynamic pressure module is programmed. It implements the dam-reservoir-foundation coupling calculation. The program using viscous-spring artificial boundary to simulate the infinite base is developed, too. The visual modeling and parametric design techniques using in RCC arch dam analysis are researched. The static and dynamical 3-D FEM analysis to a real project, Tianhuaban RCC arch dam, are done.The main contents are as follows:1.The wave theories, the FEM dynamical analysis methods and their implementation technic in ANSYS are researched. The spectrum analysis theories and the temporal analysis theories are also researched. Using the APDL language, the author has developed the hydrodynamic pressure resolving module, implement the couple-resolving techniques of the interaction among arch dam, foundation and water. The results gotten in this way meet the reality.2.The theories of the structure-reservoir-foundation interaction are researched, as well as the methods that using artificial boundary to simulate the infinite foundation. The emphases are put on the viscous-spring artificial boundary's theories and implementation methods in FEM analysis. Using APDL language, the author has developed the 3-D viscous-spring artificial boundary's implementation program in ANSYS. The calculation examples indicate using viscous-spring artificial boundary to simulate the infinite base is not only feasibleness, but also accurate.3.Using the visual modeling technique, the author has built the 3-D FEM model of Tianhuaban RCC arch dam and analyzed its static and dynamical conditions. The arch dam's stress, displacement, stability and dam-reservoir-foundation interaction on different typical work conditions have been studied detailedly. The arch dam's natural vibration characteristics and seismic response have been studied also. A group of valuable results have been obtained.In this paper, the 3-D viscous-spring artificial boundary condition is implemented and the results have high precision. The results get from the FEM analysis to the Tianhuaban RCC arch dam show that we can get the stress and displacement results, as well as the natural vibration characteristics results of the structure and the earthquake response results using the research methods and technology discussed in this paper. These results have good regularity. The results have reference value to the Tianhuaban RCC arch dam and other analogous hydro-structure's design.