强度级差带颈锻造法兰试验研究

Study on Strength-Difference Forged Hubbed Flange Test

带颈锻造法兰在输电线路钢管塔上已广泛应用,但带颈法兰规格单一,与钢管受力不匹配,即承载力低的钢管连接承载力偏大的锻造法兰,导致钢管塔不经济。针对目前带颈锻造法兰的设计方法和使用情况,结合钢管塔构件的受力特性及钢管规格库,确定锻造法兰的强度级差配置方案,通过强度级差配置的Q420高强对焊带颈锻造法兰试件轴拉试验,测试了法兰和螺栓的受力特性,验证带颈锻造法兰按强度级差配置和螺栓受力修正系数的合理性,为今后钢结构设计提供了基础性研究数据。

In recent years, the forged hubbed flange has been widely used on steel tube tower of power transmission line. However, the hubbed flange is of single specification and mismatch with steel tube in stress （i.e., the steel tube with relatively low bearing capacity is connected to the forged flange with relatively high bearing capacity）, which makes the steel tube tower uneconomical. Based on the existing design method and practical use of hubbed flange, a strength difference arrangement scheme is determined for forged flange according to the stress characteristics of the members of steel tube tower and the specification bank for steel tube. The stress characteristics of flange and bolt are tested and the rationality of strength-difference-based arrangement of forged hubbed flange and the stress correction coefficient of bohs are verified through the axial tensile test in which the specimen of strength-difference-arranged Q420 high-strength buttwelded forged hubbed flan^e is used. The test can provide the fundamental data for the design of steel strucutre in future.