锻造高颈法兰偏心受压承载力特性试验及模拟分析  

Experimental and Simulation Analysis on Bearing Capacity Behavior of the Forged High-neck Flange Under Eccentric Compression

作　　者：彭鹏 张大长[1] 孙海浪 王荣华 PENG Peng;ZHANG Dachang;SUN Hailang;WANG Ronghua(College of Civil Engineering,Nanjing Tech University,Nanjing 211800,China;Yancheng Electric Power Design Institute Co Ltd,Yancheng 224002,China)

机构地区：[1]南京工业大学土木工程学院,江苏南京211800 [2]盐城电力设计院有限公司,江苏盐城224002

出　　处：《土木工程与管理学报》2022年第1期115-122,130,共9页Journal of Civil Engineering and Management

基　　金：国家自然科学基金(51678293)。

摘　　要：锻造高颈法兰具有加工效率高、整体性好等优点,是目前1000 kV特高压钢管塔广泛采用的法兰连接形式。本文提出一种适用于钢管塔的内坡外直壁锻造高颈法兰,分别开展Q420高强钢锻造高颈法兰偏心受压试验研究与对应试件的有限元模拟,考察该型法兰节点受力性能、破坏模式以及螺栓的应力分布,重点探讨不同偏心距及法兰板厚度对螺栓拉力的影响,并提出螺栓受力修正系数m的建议计算公式。试验与有限元分析结果表明:连接锻造高颈法兰的主管在偏心距较小时发生局部屈曲失稳,偏心距较大时主管则发生强度破坏;锻造高颈法兰偏心受压时始终处于弹性阶段,且有较高的安全储备;上下法兰板之间存在撬力,锻造高颈法兰的最大螺栓拉力计算可以参考柔性法兰螺栓拉力计算公式。Forged high-neck flange has the advantages of high processing efficiency and good integrity, which is widely used in 1000 kV UHV steel pipe towers. A suitable steel pipe tower outside the inner slope of the straight wall forged high-neck flange has been proposed in this paper. In order to investigate the bearing capacity characteristics, failure mode, and the stress distribution of bolt, experimental research and simulation analysis on bearing capacity behavior of the Q420 forged high-neck flange under eccentric compression were carried out. and the influence of different eccentricity and flange thickness on bolt tension was emphatically discussed. The proposed calculation formula of bolt force correction coefficient m is put forward. The result shows that the branch pipe of forged high-neck flange is buckling when the eccentricity is small, and the branch pipe is strength failure when the eccentricity is large. Forged high-neck flange is always in the elastic stage when eccentric pressure is applied, and it has a high safety reserve. There is a prying force between upper and lower flange plates. The maximum bolt tension of forged high-neck flange can be calculated by referring to the calculation formula of bolt tension of flexible flange.

关 键 词：钢管塔 锻造高颈法兰 偏心受压试验 模拟分析 螺栓拉力 

分 类 号：TU312.1[建筑科学—结构工程]