Research On The Structure Stability And Optimization Of Dendriform Column For Large Steel Radial Gate

With the continuous development of hydropower and the significant improvement ofindustrial manufacturing level, large hydropower project develops towards high water headand large flow. As the throat of the project, the steel radial gate is going to have much higherwater head, more larger height and proportion, such as the Wu Qiangxi water control pivot,the orifice area has reached437m~2(19m×23m). There are two-arms and three-arms form fortraditional radial gate, although the former is simple to manufacture, it has defects like poorintegral rigidity, internal forces and large section size. The latter improves the integral rigidityof the gate, but the stability of the structure is poor and the dynamic characteristics are notreasonable in the same amount of material use.Dendritic structure, as a new bionic structure, has been widely used in the field ofarchitectural engineering. It has the characteristics of better path of load transfer, can form alarger support space with less material consumption, etc. These features are ideal and muchconsistent with the performance requirements of large-scale radial gate.Topology optimizationresearch has acquired the concept design of dendritic column, and has proved its reasonableload transfer mode in radial gate. Combined with the results of reasonable structure design oflarge and medium-sized radial gate, we can deduce the main frame with cross beam whichsupported by dendritic column has certain advantages in the load path, stability, economy andother aspects. Therefore, along with the development and construction of large-scale waterconservancy project, it has important scientific significance and broad application prospects toexplore the reasonable and new type structure, to improve the safety and efficiency ofmaterial utilization, and to develop a new structure design method integrated withoptimization and simulation analysis, which adapt to the modern structure designrequirements.By applying the finite element method (FEM), the structure stability theory and thestructure optimization theory, this paper has studied a new dendritic radial gate structurewhich is based on the reasonable arrangement. Aimed at the characteristics of this newstructure, this paper used the second-order elastic stability analysis method to establish thesimplified mechanical model of the radial gate, has analyzed the plane and out-of-planestability of the gate main frame with dendritic column, summarized the influence rules of design parameters on the stability of the structure, and has provided a practical formula forcomputing the effective length factors. According to the structure optimization theory, takingthe dendritic column stability results and the structural strength and stiffness as constraints,and the material use as the optimization objective, this paper has built combinatorialoptimization model for main space frame of dendritic column radial gate, in order to find theoptimal structure with safe and economical material arrangement and section size. Taking thespillway radial gate of Shuhe Hydropower Station (13m×24.3m, three-arms) as an example,according to the results of provisions optimization and the standard article, the steel radialgate with dendritic column was detailed designed and it was contrasted with the originalthree-arms design on the mechanical security and stability. After comprehensive analysis andstudies, it confirmed that: dendritic column is of excellent dynamic performance, much safeand economical structure form for large steel radial gate. Finally, combined with the finiteelement theory, the stability theory and structure optimization theory, this paper proposed a setof relatively complete integrated CAD/CAE system and a new method applied to the actualhydraulic radial gate design.