| With the further economic growth and the implement of development of the western regions, Hydroelectric construction in our country is undergoing rapid growth, Anumber of high-dam power-station is in building or in programming . In view of its higher-head and larger magnitude of spill structure outlet, It is difficult for conventional concrete or reinforced concrete structure of pier and pier room to support its vast water pressure .Coupled with the improvement of prestressed method , It has been the noteworthy tool in solving the problem. The pier room being a sophisticated spatial structure system, Conventional methods in material mechanics and structure mechanics find difficulty in describing the real burdening situation, Which presents embarrassment in designing .Introduced by prestressed pier in the gate of spillway in zi lan dam hydroelectric power station,The text reasonably established 3-D finite elements mechanic model by the advanced finite elements popular in the world which can expediently impose tension of anchor funicular at its place. It also considered possible diversified combination of loading , And indicated that the effect of its prestressed action is fruitful compared with its conventional counterpart by study of mechanic calculation in comparison. As a result, It vastly improved burdening state of pier. By analysis of 3-D finite element method, It also gained the stress result indifferent boundary conditions such as breast wall joint support and fixed support, And the displacement result in diversified loading combination. Those results gained the instructive and reference value in design of prestressed pier.
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