Yamaguchi Hydro Project Spillway Chamber Of Three-dimensional Finite Element Of The Overall Stress Calculation And Analysis

Two numerating methods are used in traditional structural design of gate chamber. First,considering the gate frusta to be fastened on the weir body,it is calculated as plane stress problem independently. Then applying the results(moment and vertical force) on the bottom of gate frusta as concentrating load on the weir body,and the weir body is viewed as a elastic foundation beam or plate and unilateral stress analysis was performed. However,the above method is not applicable for the gate chamber when the foundation of weir body is "high-low foot". For the structure that the side-frusta is also used as retain wall,considering the side frusta fastened on the weir body,the plane stress is calculated at first. Then the moments,horizontal shear force and vertical force on the bottom of the retain wall are applied as fixate,and stress distribution on the weir body are calculated piecewise. Unfortunately,the numerating model used in such method is quite different from the actual instance,,and the constraints are too simple,the effects of the side load,elastic modular of the stone body of the foundation and the compatible structural deformation are not involved in. Due to the asymmetry of the spatial load,it is quite different between the analysis results and the test data. Traditionally,loads of the arc gate are applied on the support or gate frusta as a set of concentrated load,but the effect range of such load on the frusta cannot be solved by Material Mechanics and Structure Mechanics. Most of the load cases are fulfilled through optic-elastic test. Due to the complexity of the load combinations of the gate chamber,it is difficult to perform such test on each load case. On the other hand,it is lack of the test data on the load case perpendicular to the current direction of the gate frusta till now.Shankou spillway project has many specific characteristics,for example,the gate frusta and weir body have equivalent thickness,the weir body is low and have corridor,the foundation of the weir body is "high-low foot'' and the side frusta is also used as retain wall. In view of the characteristics,to better analyze the stress distribution on weir body,gate frusta,the joints between gate chamber and weir body,under the condition that the gate chamber is applied with asymmetrical loads and complicated constraints,three dimensional Finite Element Method is applied in this paper. Therefore,theoretical accordance for the design of gate chamber are provided.