输电钢管塔新型锻造法兰破坏模式研究

Test and Analysis on Destructional Forms of Forging Flange Used in Steel Tube Towers

针对输电钢管塔采用传统锻造法兰和新型内外双层锻造法兰两种节点连接形式,选取法兰盘厚度、螺栓个数、螺栓孔中心到法兰外缘的距离及螺栓孔中心到法兰颈根的距离4个计算参数,利用Ansys软件建立了输电钢管塔法兰节点连接有限元模型,研究了在轴向拉力作用下两种锻造法兰节点的破坏模式。结果表明,传统锻造法兰有螺栓弯曲屈服、法兰颈变坡段与直坡段接触点屈服两种破坏形式;新型内外双层锻造法兰有法兰颈根屈服、钢管拉伸屈服两种破坏形式,同时法兰盘厚度、螺栓个数均小于传统锻造法兰。

The transmission steel tube tower has two joint forms, that is, traditional forging flange and new-type double-layer forging flange. Choosing the thickness of flange, numbers of bolt, distance between bolt-hole center and out- ward flange, distance between bolt-hole center and flange neck as computing parameters, software Ansys is used to estab- lish finite element model of transmission tower flange joint and study the destructional form of two forging flange joints under the action of axial tensile force. The results show that the traditional forging flange joint has two destructional forms： bolt bending yield and flange neck contact yield between variable solpe section and straight slope; the new type forging flange joint has two destructional forms： flange neck yield and steel pipe tension yield. At the same time, the thickness of flange and the numbers of bolt are less than that of the tranditional forging flange.