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Radial Gate Stress Calculation Method of the Main Beam and the Optimization of the Main Framework

Author: HanYanBao
Tutor: WangZhengZhong
School: Northwest University of Science and Technology
Course: Hydraulic Structure Engineering
Keywords: Radial gate Shaped cross section Stress calculation Unit stiffness ratio Optimization of the main frame Genetic Algorithms
CLC: TV663.2
Type: Master's thesis
Year: 2010
Downloads: 22
Quote: 0
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Abstract


The arc just Gate Beam the uniaxial symmetry BEAM, when on the flange in the role of a uniformly distributed load (deep hole radial gate case) or linear load (main beams Spillway Radial Gates case) cross-section not only has a positive stress, and the shear stress, then the cross-section of the beam will be warped. Since each different result of the cross-sectional shear adjacent sectional warping not synchronized, causing the adjacent cross section of the longitudinal fibers is stretched or compressed, thus affecting the distribution of the bending stress. The deep beam cross-section of the normal stress calculated use of slender beams in the mechanics of materials pure bending theory to calculate, but mainly for the rectangular cross-section beams. Still use the theory of deep beams will bring large errors, it is necessary for H-section deep beams bending stress, shear stress and compressive stress analysis of the system. The the radial gate because of its opening and closing force is small, easy to operate, good water conditions (no cavitation and vibration), widely used in water conservancy and hydropower project. The main frame is the main load-bearing structure of the radial gate, gate weight of 60% to 70% of its weight is generally accounted for. Optimization of the main frame in the past was mainly based on the use of different algorithms, or to improve the algorithm. And these methods are based on the optimization of the plane frame, did not consider the longitudinal bending moment and unreasonable. Set out the arrangement of the main beams etc., and so on, in the main crossbeam design is conservative, not economic. In this paper, these two aspects do some exploratory research, the main contents are as follows: (1) extensive reading a lot of steel beam stress calculation methods related literature, in-depth study of the characteristics of the various calculation methods and concluded there the problem; system learning ADINA software, the use of the MATLAB software. (2) Deriving a deep hole radial gate main beam stress formulas, but also by the expression of stress when the biaxial symmetry-shaped cross section double cantilever steel beams subject to uniform loads. Invert the the main stringers Spillway Radial Gates main beam stress calculation formula, while drawn the biaxial symmetry workers font steel beams linear load stress expression. (3) application of the finite element software ADINA results line a numerical example. The answer in the same conditions on the use of material mechanics, finite element solutions and the results of this paper to do a comparative analysis of the results showed that the rationality of deep beam results of this paper. (4) the introduction of the theoretical results-shaped cross-section deep beams stress to the the arc door main beam across internal stress calculation, given the main beam of uniform water pressure under the main beams curved steel gate three frame structure across The internal stress is calculated, and analysis of the main beam units stiffness and arm stiffness ratio and the main unit of the framework in the form of bending stress. (5) in hole radial gate main frame structure, reasonable layout, and then use the genetic algorithm for optimal preservation strategy based on MATLAB ranging from carrier optimization design, making the plane frame optimization is equivalent to the space frame optimization. So as to achieve material savings and improve structural reliability goals.

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CLC: > Industrial Technology > Hydraulic Engineering > Water control,hydraulic structures > Sluice > Gate > Radial gate
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