(南京工业大学土木工程学院， 塔桅结构工程研究中心， 南京 211800)

［摘要］柔性法兰是一种盘面平整、易于加工的钢管连接形式。但是，由于法兰主管与法兰盘间未设置加劲肋，法兰节点的刚度相对较小，盘面会发生翘起变形。基于此变形特点，开展了柔性法兰轴拉承载力试验及非线性有限元模拟分析，考察柔性法兰的轴拉承载力特性，重点研究柔性法兰盘面变形特性及应变发展规律。研究结果表明：轴拉作用下法兰主管与法兰盘连接焊缝处存在应力集中现象且试验中也在此焊缝处被拉裂； 法兰盘下侧受拉，上侧受压，法兰盘根部张开，盘面中部应变发展最快。基于试验及模拟分析结果，柔性法兰连接螺栓处于拉弯复合受力状态，螺栓受力修正系数m值略小于规范值； 法兰盘相对转角计算公式可用于柔性法兰连接设计。

［关键词］柔性法兰； 轴拉承载力试验； 非线性有限元分析； 盘面变形； 连接螺栓； 相对转角

中图分类号：TU392-3文献标识码：A文章编号：1002-848X(2020)22-0130-07

Research on bearing capacity characteristics of flexible flange under axial tension

FAN Wenfeng, CUI Jiacheng, ZHANG Dachang

(College of Civil Engineering, Engineering Research Center of Tower and Mast Structure, Nanjing Tech University, Nanjing 211800, China)

Abstract:Flexible flange is a kind of steel tube connection form with flat surface and easy processing. However, because there is no stiffening rib between the flange main pipe and the flange plate,, the stiffness of the flange joint is relatively small, and the flange plate will take up the warping deformation. Based on this deformation characteristics, the flexible flange axial tension bearing capacity test and nonlinear finite element simulation analysis were carried out to investigate the axial tension bearing capacity characteristics of the flexible flange, and the focus was on the deformation characteristics and strain development law of the flexible flange plate. The research results show that there is a stress concentration phenomenon at the welding seam of the flange main pipe and the flange  plate under the action of axial tension, and the welding seam is also stretched in the test; the lower side of the flange plate  is tensioned and the upper side is compressed. The root of flange plate is open, and the strain in the middle of the plate is developing fastest. Based on the results of test and simulation analysis, flexible flange connection bolts are in a state of combined tension and bending, and the bolt force correction factor  m is slightly smaller than the standard value. The calculation formula for the relative rotation angle of the flange proposed  can be used for the design of flexible flange connection.

Keywords:flexible flange; axial tensile bearing capacity test; nonlinear finite element analysis; plate surface deformation; connecting bolt; relative rotation angle

*国家自然科学基金资助项目(51678293)。

作者简介：范文峰，硕士研究生，Email:fwfnjut@163.com； 通信作者：张大长，博士，教授，Email:dczhangchina@163.com。