Dynamic Stability and Flow-induced Vibration on Giant Floating Body Gates

With the continuous construction of sluice gate projects in China, oversized sluice gates continue to emerge. Giant floating body gates are also beginning to be used for blocking and releasing water in the operation of oversized span gates. Because this type of gate adopts the floating box single side vertical axis plane rotation type gate, its operation characteristics are different from the conventional penning gate or upturned arc gate, and it needs to open and close in the moving water, there are a series of technical difficulties such as oscillation and dynamic stability of the gate brought by the hydrodynamic action and water level, etc. Therefore, the vibration and stability characteristics of the floating body gate under different discharge flow and different opening and closing speeds are investigated through the specially designed 1∶25 hydro-elastic vibration model. Through the hydraulic structural characteristics test of the gate structure, the stability and safety characteristics of the gate opening and closing operation is carried out systematically, and the dynamic parameters such as vibration acceleration, vibration displacement, rigid body sway and gate support hinge force and dynamic displacement of the support hinge vertical axis are obtained for the gate structure of large gate bore under specific conditions. the relationship between dynamic water flow rate and automatic closing in the process of floating body gate closing, and propose measures to avoid collision of gate pier and control the whole force of wire rope of opening and closing gate was revealed. The basic conclusion are as follows. The flow rate of water under the gate bore needs to be strictly controlled to reduce the speed of gate opening and closing, and ensure the safety of floating body gate operation was obtained. The research results could provide a reference basis for the design and construction of similar large drainage（retaining） gate projects.