Both total potential energy and buckling equation of two-span continuous beam with lateral elastic brace under uniform load are deduced, based on energy variation method and the principle of minimum potential energy. Buckling of H-beams is simulated by ANSYS software, then compared to theoretical value, validated its rationality. High precision buckling moment formula is regressed using 1stOpt which is a famous mathematical optimization analysis software in China. The relationship between lateral brace stiffness and buckling moment is obtained. Results: with lateral brace stiffness increases, critical bending moment of beam increases within up-limit, e.g. when lateral brace stiffness increases to certain extent, buckling moment no longer increases.
This paper summarizes the Ge recovery technologies from coal, the traditional treating process is firstly introduced, which is burning and recycle burning the coal for Ge enrichment in the fly ash and then Ge is recovered by Chloride distillation method. The process material balance is calculated as followed. Different hydrometallurgical methods for Ge recovery from ash are compared for the advantage and disadvantage. The other methods like microbial leaching and dry distillation are reviewed as well. Lastly, the drawbacks and development direction of Ge recovery from coal are predicted.
Dynamic stability analysis of twelve single-story steel frame structures is analyzed based upon the finite element method. The influence of different earthquake excitations on dynamic stability of single-story frame is studied. Time history curves of displacement, hysteretic curves of restoring force, phase plane trajectory curves have been obtained. The results indicate that the ultimate displacements of frames when structures collapse are almost identical and ultimate displacements are independent of earthquake excitations.
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