| Miter gate is a complicated tridimensional beam-slab structure, and the combining form of it can be changed according to different project conditions. The principal method of gate design is that simplifying all structural elements into plane members and calculating by structural mechanics. However, the integral tridimensional operating performance of gate can not be reflected by this method. Referring to the existing literatures and information, the studies and applied achievements about vibration occurred by colliding on hydraulic gate are still not very much. Basing on the large-scale common software ANSYS and combining the key problems encountering in the miter gate design of Huai'an No.3 Shiplock, this paper analyzes the stressing characteristics and operation modes of miter gate to establish simulation models with three dimensional structure, and studys the dynamic response of miter gate under ship impaction. The detail contents are as follows:1. Unit model reflecting the actual work conditions by ANSYS is selected in this study, and three-dimensional finite elements model of miter gate is established according to the stress characteristic and work model of miter gate.2. Impact Dynamics Theory and Basic Theory of dynamic finite element are introduced in this paper. Equation solution for coupled interaction of water body and gate is determined by adopting principle of the interaction between structure and water body. Secondary development technology of ANSYS is studied, and equation solution for added mass of hydrodynamic pressure is established by using parametric design language (APDL) of ANSYS.3. As per the work characteristics of the miter gate in Huai'an No.3 Shiplock and adopting modeling method promoted in this paper, elaborate finite element model has been established and dynamic characteristics of Huai'an No.3 Shiplock under ship impact has been calculated by the method put forward in this paper. Self-vibration characteristics of different water level and vibration rule under different impact position, different impact direction and different water depth have been analyzed for miter gate, and some helpful suggestions have been advanced in this paper.4. Stress and deformation laws of the principal members (faceplate, girder, longitudinal beam, and A/B bar) in gate under impact have been analyzed in detail. Strength and rigidity of miter gate have been checked. The calculation result indicates that yield failure will be occurred when the stress at impact point is much heavy (beyond the allowable strength of materials). This yield failure belongs to stress concentration, and the range of influence is much small. Therefore, the influence of overall strength and rigidity of gate is not too much, and the overall strength of gate conforms to the design requirements. Ship fender or other defense elements will be used at impact parts to ensure the girder and longitudinal beam will not be destroyed by nonrenewable deformation, and the overall stability can be ensured.
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