摘要
钢管塔结构构件普遍采用圆形法兰连接,大型杆塔的交叉材、斜材与主管相贯连接,支管采用与其垂直的圆形法兰连接接长;该连接法兰在一定程度上增大了节点域尺寸,可能造成节点过大给镀锌及运输带来困难。为此,研究开发一种法兰盘面平行于主管轴线的新型异形法兰。该法兰盘面形状为椭圆形,以法兰盘面与支管夹角为参数,开展轴拉荷载作用下刚性异形法兰承载力特性的非线性模拟,考察其轴拉荷载-变形特性及连接螺栓的受力特点。新型异形法兰轴拉承载力与圆形法兰基本具有相似的特性,但在轴拉荷载增大过程中,由于法兰盘面滑移导致连接节点轴向位移突然增大,荷载-变形关系继续线性增大并进入弹塑性阶段;滑移荷载与夹角和预紧力大小有关。连接螺栓受拉剪共同作用而发生弯曲,其应力最大位置位于两侧法兰板接触面。最后,提出异形刚性法兰的设计方法,包括法兰板、加劲肋及连接螺栓的强度设计理论。
Circular flange has been widely used to connect structural components of steel tube tower.The cross material and the diagonal member of large tower are connected with the main pipe,the branch pipe is connected by flanges which is vertical to itself.However,the joint flange may increase the size of the joint to a certain extent,which makes it difficult to galvanize and transport.A new type of special-shaped flange with elliptical flange section parallel to the main axis was developed;the nonlinear finite element simulation of special-shaped rigid flange with different angles of flange plate and branch under axial tension was carried out,the load-deformation characteristics and the force characteristics of the bolts were investigated.The results showed that the bearing capacity of the new special-shaped flange was basically similar to that of the circular flange.However,due to the slip of the flange surface,the axial displacement of the connection joint might suddenly increase in the process of increasing the axial load.Then the load-deformation relationship continued to increase linearly and finally entered the elastic-plastic stage.The slip load was related to the angle and the size of pre-tightening force.The connecting bolt was bended by the combined action of the tension and shear force,and the maximum stress was located on the contact surfaces of flange plates on both sides.Finally,the design method of the special-shaped rigid flange was proposed,including flange plate,stiffener and strength design theory of connecting bolt.
作者
徐嘉毅
郭勇
张大长
XU Jiayi;GUO Yong;ZHANG Dachang(College of Civil Engineering,Nanjing Tech University,Nanjing 210009,China;Zhejiang Electric Power Design Institute,Hangzhou 310012,China)
出处
《钢结构（中英文）》
2019年第9期50-55,共6页
Steel Construction（Chinese & English）
关键词
钢管塔
刚性法兰
异形法兰
有限元
steel tube tower
rigid flange
special-shaped flange
finite element
