(1 国网江苏省电力有限公司经济技术研究院， 南京 210008； 2 国网江苏电力设计咨询有限公司， 南京 210008； 3 南京工业大学土木工程学院 塔桅结构工程研究中心， 南京 211816；4 江苏振光电力设备制造有限公司， 镇江 212000)

［摘要］柔性法兰节点通过内外两道角焊缝传力，具有安装快捷、加工简单且省材省时等特点。对柔性法兰进行受弯承载力试验，并对相应法兰进行有限元模拟分析，考察柔性法兰的受弯承载力特性，重点研究柔性法兰内外环向角焊缝的受力机理和分担比例。研究结果表明，纯弯作用下柔性法兰受拉侧外焊缝与主管连接处存在较大应力集中，受拉侧外焊缝为主要的传力焊缝，而内焊缝在保证柔性法兰节点安全稳定的前提下提供第二道传力机构；纯弯受力时柔性法兰受拉侧外焊缝与内焊缝受力分担比例比在3.6以上，设计及加工时应特别注意外焊缝的应力及质量，建议适当减小内焊缝焊脚尺寸至外焊缝的2/3，使法兰焊缝构造更加合理，该研究成果可为柔性法兰及其焊缝设计加工提供参考。

［关键词］柔性法兰； 内外角焊缝； 受弯承载力； 分担比例； 有限元模拟

中图分类号：TU392-3文献标识码：A文章编号：1002-848X(2020)11-0070-06

Flexural bearing capacity test and weld stress analysis of flexible flange joint used in steel poles

WANG Tinghua1,2, FAN Wenfeng3, HUANG Guohuan4, LI Daijun4, ZHANG Dachang3

(1 Economic Research Institute, State Grid Jiangsu Electric Power Company, Nanjing 210008, China; 2 Jiangsu Electric Power Design Consulting Co., Ltd., Nanjing 210008, China; 3 Engineering Research Center of Tower and Mast Structure, College of Civil Engineering, Nanjing Tech University, Nanjing 211816, China; 4 Jiangsu Zhengguang Electric Power [JZ]Equipment Manufacturing Co., Ltd., Zhenjiang 212000, China.)

Abstract:The flexible flange joint transmits force through two internal and external fillet welds, which has the characteristics of fast installation, simple processing, and material and time saving. The flexural bearing capacity test of the flexible flange was carried out, and the corresponding flange was subjected to FEM simulation analysis to investigate the flexural bearing capacity characteristics of the flexible flange. The focus is on the mechanism and sharing ratio of internal and external circumferential fillet welds of the flexible flange. The research results show that there is a large stress concentration at the connection between the external weld on the tension side of the flexible flange and the main pipe under the action of pure bending; the external weld on the tension side is the main force transfer weld, and the internal weld provides a second force transmission mechanism on the premise of ensuring the safety and stability of the flexible flange joint; the stress ratio of the external weld to the internal weld on the tension side of the flexible flange under pure bending is greater than 3.6, and special consideration should be given to the design of the external weld when designing and processing. It is suggested that the size of the internal weld bead to 2/3 of the external weld be appropriately reduced to make the flange weld structure more reasonable. The research results can provide a reference for the design and processing of flexible flanges and their welds.

Keywords:flexible flange; internal and external fillet weld; flexural bearing capacity; sharing ratio; FEM simulation

*国网江苏省电力公司科技项目（J2017055），国家自然科学基金项目（51678293）。

通讯作者：张大长，博士，教授，Email:dczhangchina@163.com。