| In this paper, finite element analysis of the trussed supporting structure used in large-scale tower was performed at first. Then, the optimizaton function of ANSYS was applied to obtain the optimum structure of the trussed support.The characteristic of three types of supporting structure was introduced and compared, and trussed supporting structure was employed in this large-scale vacuum tower.Besides, the structure design of parallel-chorded truss and the checking method of strength and stability were introdeced consulting steel structure design manual.The trussed beams, used as packing support in the large-scale vacuum tower, were grouped into type-I and type-II according to the structure characteristic.The type-II was combined type supporting beam, the truss of which was set in oil-collecting channel. The calculation results of the stress, obtained by finite element method and theoretical calculation method, were coincident. Taking beam-A and beam-C support of washing section as example,finite element numerical calculation for these two different types trussed beam was performed,and the nephogram of von Mises stress and vertical displacement were gained.All of the trussed beams in the large-scale tower satisfied the requirement of both strength and stiffness.The parameters of truss configuration and cross-section dimensions were defined as optimization variables.The strength and stiffness conditions were defined as constraint condition and the volume of the model was defined as objective function. The finite element analysis files were modified to create optimization file,and then structure optimization for these two types of trussed beam was performed making use of the optimization function of ANSYS.Finally, in order to prepare material and manufacture conveniently, the optimization results were rounded numbers, taking the height and weight of the truss as top-priority factors for type-I and type-II supporting beam,respectively. |
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