The Optimal Design And Reliability Analysis Of Steel Radial Gate

In the field of hydroelectric engineering, hydraulic steel gate is an indispensable component of steel structure, which is widely used in navigation, irrigation, water diversion dam’s power generation system. There are many types of gates. Among them, the steel radial gate has advantages that other types of gates don’t have. So the steel radial gate becomes the most common form of the gates. In the design and study of the steel radial gate, because the traditional calculation method based on the planar analysis ignores the interaction between components, it will lead to inaccurate results. At the same time the efficiency is not high through the trial method, and the final structure is conservative. Besides, the reliability ananysis of the designed structure is necessary due to unavoidable randomness in engineering.This article uses the finite element simulation technology ANSYS to proceed with three-dimensional modeling and stress analysis of the gate, taking into account the interaction between various components of the steel radial gate. On this basis, optimization design is performed to find a balance point between safety and economy. Finally, reliability analysis is utilized on the optimized structure. Main contents are as follows in the paper:1、Introduce the composition, classification form of the steel radial gate and the arrangement of the important components. Then explain the details for establishing the finite element model, including the element type, load combinations, constraints, and the relevant specification requirement for gate. According to the description of establishing finite element model, establish a physical model of the gate, study and analyze the common excitation and resistance of this model, make the preparation to structure optimization and reliability analysis.2、Execute optimization design based on the limit state equations of the steel radial gate through combining optimization ability of particle swarm optimization algorithm and analysis ability of ANSYS. Compared with traditional trial design method, this method does not produce overly conservative design results. Compared with SLP optimization algorithm included in ANSYS, this method avoids the problem of local convergence. The steel consumptions of three different forms of the main frame are compared and it is concluded that the form of double girder steel radial gate has priority due to its relatively uniform stress and low cost.3、According to "Water Resources and Hydropower Engineering steel gate design" and structural reliability theory, this paper uses the optimized structural model to check the reliability of the important mechanical components under different load combinations. As can be seen from the results, the strength of the main beam is the weakness of influencing structural reliability, and the working condition of wave pressure combination had the greatest influence on structure safety. The article provides us with a reference in the conservative design and gate operation.