Abstract:

To offer a reference for the safety monitoring of a large-scale hydropower station, we conducted a vibration characteristics analysis of surface radial gate of the dam using finite element calculation software ANSYS. We primarily investigated how the elasticity of water stop structures affects the vibration modes and natural frequency of the gate. The analysis reveals that the elasticity of water stop structures has a certain degree of influence on the gate’s vibration characteristics. Compared with the calculation results neglecting the elasticity of water stop structures, the frequencies of some vibration modes closely related to the constraint conditions on both sides of the gate can differ by up to 46.80%. Within a certain range, as the foundation stiffness coefficient which characterizes the elasticity of water stop structures decreases, the vibration frequency of the same vibration mode declines. When the foundation stiffness coefficient ranges from 0.1 to 0.2 N/mm³, the simulation results align with the observed prototype gate’s vibration response. Additionally, we also proposed a method to quantify the elasticity of water stop structures, providing basic data for selecting correlation coefficient values, and potentially offering a reference for the safety monitoring of the studied hydropower station and the vibration analysis of gates in other projects.

Key words: radial gate, water stop structure, vibration characteristics, numerical simulation