| Arc main beam gate is the single symmetric I-shaped beam, when the top flange in the role of a uniformly distributed load (deep radial gate case) or linear loads (the main beams Spillway Radial Gates in the case), cross section not only withstand the normal stress but also shear stress, then beam cross-section warping will occur. As a result of the different cross-section leading to the adjacent section of the shear warping of sync, causing the vertical cross section of adjacent fibers stretched or compressed, thus affecting the distribution of bending stress. Previous beam cross-section the normal stress is calculated using mechanics of materials in pure bending of slender beam theory, and aimed to calculate the rectangular beam. Are still in deep beams with the theoretical calculation will bring big error, it is essential to deep-beam shaped cross section, bending stress, shear stress and compression stress analysis of the system.Radial gate hoist force its small, easy to operate, the water conditions are good (no occurrence of cavitations and vibration), while widely used in hydropower projects. The gates to the main frame is the main load-bearing structure, the weight of the gate weight is generally accounted for 60% to 70%. In the past on the main frame of the optimization is mainly based on different algorithms or to improve the algorithm. But these methods are mainly based on optimization of plane frames, without considering the vertical bending moment and unreasonable. And the main beam is contained by such arrangements, so that, on the main beam design is conservative, not economic.In this paper, these two aspects of doing some exploratory research, mainly includes the following:(1) Extensive reading a lot of documents about steel beam stress calculation methods, studying of the characteristics of which method and summarize the problems; studying how to use the ADINA software and MATLAB software systematically.(2) Invert the main longitudinal beam type Spillway Radial Gates in the main beam stress equation to arrive at the same time symmetric I-shaped steel beams under biaxial linear load when the stress expression. Invert the deep arc of the door main beam stress analysis formulas, while also axis symmetrical double cantilever beam shaped cross section, subject to uniform load, the stress expression.(3) Finite element software ADINA lines results and a numerical example. Materials used in the same condition on the mechanical solution, finite element solution and the results of this paper made a comparative analysis of results showed that the calculation of deep beams in this paper, the results more precise.(4) Will work deep beam stress calculation shaped the theoretical results of the introduction to the radial gate across the main beam to the calculation of internal stress, water pressure is given uniform beams under the main gate of the three curved steel girder cross-frame calculation of internal stress formulas, and analyzes the main beam unit stiffness and rigidity of the arm unit and the main frame form of the ratio of bending stress.(5) On the main frame in the hole radial gate structure was a reasonable arrangement, then the optimal preservation strategy based on MATLAB genetic algorithm optimization ranging from set design, makes the optimization of the equivalent plane frame space frame optimization. To achieve the savings in materials, to improve structural reliability goal. |
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