Space Finite Analysis Of Sector Lock Gate Structure

Sector lock gate is used widely because it can not only bear two-way water heads but also open and close conveniently in dynamic water. Jianbi lock gate which bears water pressure and ship impact force, an example of sector lock gate, is analyzed in space finite element ways in this dissertation.Arrangement of structure, character of sector lock gate under loads are introduced briefly. Prescription and empirical formulas about collision loads are also introduced in this dissertation. The collision procedure of ship and lock gate is simulated and analyzed with ANSYS/LS-DYNA program. The time-curves of collision loads are obtained and the conclusion that the results of empirical formula are lower than that is got by finite element method. The relation between collision loads and structure stiffness, tonnage and velocity of ships is analyzed and following conclusions are got: (1) the rigidity of collided object has great affection on collision loads. The collision loads increases with the accretion of collided object rigidity. However, the variation of vessel rigidity has less relationship with the collision force. (2)The load increases synchronously with accretion of ship tonnage and collision speed, but does not follow the direct ratio as shown in the design criterion home and abroad.(3)When lock gate is not collided in right angle, the Minorky theory is approved by finite element results. Tolerance may occur and it will be conservative if collision force is obtained by multiplying the sine of collision angle directly by frontal collision force.The three calculation models of Jianbi lock gate are analyzed, including the initial design model and two reinforced models. After choosing elements, meshing models and applying constraints the three models are calculated. Some conclusion is obtained through calculation: (1) every structural member satisfy design criteria when the sector lock gate is under the action of the still water force (2) the connection places of arms and main beams should be strengthened because of the stress concentration (3) the reinforcement of lock gate is effective.