ABSTRACT
ABSTRACT: Leakage holes, which allow water pour outside when the hydraulic gate is lifting, is usually treated as the secondary design in the hydraulic gate. Small leakage hole would result in a blockage by sundries in the water after long-time gate idle. Consequently, the residual water would cause the corrosion in main girders. Obviously oversized leakage hole would weaken the strength of girders. By using the optimal module in FEM software ANSYS, the reasonable diameter of leakage holes can be obtained. Technically, the diameters are set as design variables and the total weight of the gate is the performance function. Stress and displacement constraints should be also considered.
