Analysis Investigation On The Seismic Response Of The System Arch Dam-Reservoir Water-Foundation

China is rich in hydropower resources, the theoretical potential of about 667 million KW, according to the latest survey results may be developing a capacity of 529 million KW, ranked first in the world, less than 20 percent of the development level. China's hydropower resources of the 80 percent of the western region, especially the southwest. But dam area by a strong regional geological structure, the western hydropower development difficult avoidance of high seismic zone. Earthquake and the seismic response of high arch dam structure is very complicated. So far, both at home and abroad to build strong earthquake in the high arch dam little experience in the engineering practice, without strong earthquake with the test case. Once suffered damage while the accident, the secondary consequences will be very serious disaster. The seismic safety of the high dam must be treated with caution, in the face of the lack of precedent in the new problems and challenges, it is urgent to establish seismic dam innovative ideas.This paper based on a system study on dynamic analysis theory of structures, the fluid-solid coupling theoretical analysis ,and local artificial boundary theory made the finite element model of dam-water-foundation interaction system. About the interaction analysis of structure-basement system, after researching on the fluctuation theory, the text puts forward to viscous-spring artificial boundaries and writes calculation program about 3-D viscous-spring artificial boundaries was used in ANSYS by the APDL parametric language of ANSYS. The result of typical calculation examples shows that simulated infinite foundation by viscous-spring artificial boundary is not only feasible, but also the higher precision, and is in accordance with the actual case. Then in paper dynamic analysis module by the APDL parametric language of ANSYS was written to gaining the coupling solving of dam-water-foundation system. Also in the text automatic input program of seismic waves and seismic time-history analysis theories were complied.This paper made 3-D finite element model of concrete arch dam by ANSYS and static and dynamic calculating analysis. And the result shows frequency of dam body with filled water is the smaller than in no water and vibrating shape was in accordance with regularity. After comparing results between dynamic and static calculating analysis we can seen that result in dynamic calculating analysis was the larger than in static analysis and the compressive stress area in static calculating analysis would be tensile stress area.We could seen that from the result it is a feasible and effective method for dynamic analysis of arch dam to make the finite element model of dam-water-foundation interaction system...