深孔平面钢闸门主梁排水孔尺寸对整体结构的影响分析

发布时间：2018-04-29 03:26

本文选题：平面钢闸门 + 有限元分析　；参考：《昆明理工大学》2017年硕士论文

【摘要】：平面钢闸门在水利水电工程中应用广泛,主要具有结构简单,制造、安装、维修方便等优点,因此平面闸门的安全性对于水工建筑物具有重要意义。平面闸门完成正常的启闭任务过程中,需要克服作用在主梁腹板上的水流下吸力以及淤积的泥沙造成的影响,常常通过在主梁腹板处设置排水孔(长圆形)解决。排水孔开孔过大会降低主梁以及闸门整体安全性能,由于设计规范中未对排水孔截面尺寸作出具体要求,因此需要对排水孔截面尺寸问题进行分析研究。以某水电站平面钢闸门设计为例,使用有限元软件对其建立模型,计算得到不同截面尺寸排水孔,各个构件的应力值和变形量的变化规律,比较分析得到较为合理的开孔尺寸。通过计算证明了设置排水孔加强环的必要性,对比坡口焊和贴角焊的焊缝计算结果,使用坡口焊固定加强环更加安全。运用特征值屈曲方法计算,得出了开孔腹板的屈曲荷载和屈曲模态;通过选用一种代表屈曲荷载大小的屈曲系数,研究了腹板开孔大小与屈曲荷载之间的关系,最后给出了屈曲系数与开孔系数的拟合公式,为闸门主梁腹板开孔的设计工作提供参考。本文通过计算结果可以得到以下结论:平面钢闸门构件应力、变形随着排水孔截面尺寸变小而减小;当排水孔尺寸减小后,各构件强度和刚度可以满足设计规范中的要求。开孔腹板屈曲系数随着开孔尺寸增大而减小,表明腹板开孔过大更易发生局部屈曲效应。平面闸门排水孔截面尺寸的选择直接影响整体结构安全性,因此需在设计初期进行严格的力学分析。
[Abstract]:Plane steel gate is widely used in water conservancy and hydropower projects, which has the advantages of simple structure, easy manufacture, installation and maintenance, etc. Therefore, the safety of plane gate is of great significance to hydraulic structures. During the normal opening and closing task of the plane gate, it is necessary to overcome the influence of the suction under the water flow and the silt deposition on the web of the main girder, which is often solved by setting a drainage hole (oblong circle) at the web of the main girder. The safety performance of the main beam and gate is reduced by the opening of the drainage hole. Because the size of the section of the drainage hole is not required in the design code, it is necessary to analyze and study the size of the section of the drain hole. Taking the plane steel gate design of a hydropower station as an example, the finite element software is used to establish a model of the gate, and the variation law of stress and deformation of each member is obtained by calculating the drainage holes with different cross-section sizes, and the reasonable opening size is obtained by comparison and analysis. The necessity of setting drainage hole strengthening ring is proved by calculation. Compared with the calculation results of groove welding and fillet welding, it is more safe to use groove welding to fix the reinforcing ring. By using eigenvalue buckling method, the buckling load and buckling mode of the open web are obtained, and the relationship between the open hole size and the buckling load of the web is studied by selecting a buckling coefficient representing the buckling load. Finally, the fitting formula of the buckling coefficient and the perforation coefficient is given, which provides a reference for the design of the opening of the main girder web. In this paper, the following conclusions can be drawn from the calculation results: the stress and deformation of plane steel gate members decrease with the size of the drain hole section, and the strength and stiffness of each member can meet the requirements of the design code when the size of the drain hole decreases. The buckling coefficient of the open web decreases with the increase of the size of the opening, which indicates that the local buckling is more likely to occur when the opening is too large. The selection of cross section size of plane gate drainage hole directly affects the safety of the whole structure, so it is necessary to carry out strict mechanical analysis in the early stage of design.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TV663.4

【参考文献】