Analysis On Dynamic Responses Of Cantilever Type Steel Gate Under Wave Load

Wall made of cantilever type steel gate to prevent flood is a new form of reinforce to the dike. Compared with the traditional method of filling the soil to construct dam to add the high extension and setting up flood control walls of reinforced concrete to increase the flood control standard, this method has advantages of not breaking the city landscape, not much sharing the city land, costing cheaply, and being safe and reliable. It represents a new developmental direction of the flood control engineering of our country cities and has a very important realistic meaning in adding high reinforce developments to city flood control. In this paper, software ANSYS and FLUENT are used to analyze the dynamics characteristic and the static and dynamic responses of the cantilever type steel gate under the wave forces.Firstly, the calculation of static forces under designed flood forces is carried out and is compared with experimental results, the results show that the rigidity and stress of the steel gate under static forces satisfy the designed remands.Secondly, the modal analysis for steel gate is carried out. Considering that sometimes there is not water in front of the steel gate, both dry and wet modals are analyzed. The results show attached water affect the proper frequency of the steel sluice board very big and decline to 64%, the proper frequency of the steel sluice board is far higher than the encouraged frequency of the wave forces, and in the design circumstance the steel sluice board can't take place to totally flap.Thirdly, we got dynamic forces of waves through the world-famous CFD software FLUENT. Numerical waves can be produced withreasonable settings of the boundary conditions in FLUENT.At last, the dynamic response of the steel gate is analyzed. The influence of water on sluice board vibration is considered in form of the attached water mass, and the attached water mass is assumed to be even distributed on the wetted surface of sluice board, then calculation is carried on by the use of ANSYS and applying the wave forces to FEM model. Results show that the response of the steel gate to vibration under wave forces is weak and the strength is enough.