(1 中国电力科学研究院，北京 100055; 2 国网浙江省电力公司,杭州 310007; 3 西安建筑科技大学土木工程学院，西安 710055)

［摘要］加劲钢管是把纵向或横向加劲肋焊接在传统钢管内壁上而生成的一种新型构件，已计划作为大跨越输电塔的主材，残余应力对加劲钢管的性能具有重要影响。首先根据大跨越输电塔工程需要，设计了3种不同加劲肋布置方式的加劲钢管和1种无加劲肋钢管的试件，每种试件各3个，共12个试件；然后采用盲孔法测试了这些试件的残余应力。研究结果表明：加劲钢管的残余应力场可视为钢管对接焊缝和加劲肋焊缝残余应力场的叠加。该应力场具有以下特点：加劲钢管的残余拉应力峰值和位置与无加劲肋钢管基本相同；加劲钢管的残余压应力峰值大于无加劲肋钢管，且其残余压应力峰值位置会有较大变化；加劲钢管的加劲肋处存在明显的残余拉应力，但该残余拉应力明显低于钢管对接焊缝处的残余拉应力。

［关键词］盲孔法；加劲钢管；残余应力；焊缝；大跨越输电塔

中图分类号：TU392文献标识码：A文章编号：1002-848X(2020)23-0058-06

Study on residual stress distribution characteristics of stiffened steel pipe of the chord member in large span transmission tower

LIU Haifeng1, BIAN Qi2, FU Dahong2, ZHU Binrong1, YANG Junfen3

(1 China Electricity Power Research Institute, Beijing 100055, China; 2 State Grid Zhejiang Electric Power Company, Hangzhou 310007，China;3 School of Civil Engineering, Xi′an University of Architecture and Technology, Xi′an 710055, China)

Abstract:Stiffened steel pipe is a new type of component produced by welding longitudinal or transverse stiffeners on the inner wall of traditional steel pipe, it is prepared to be used as the chord member in large span transmission tower, and residual stress has an important influence on the performance of stiffened steel pipe. Firstly, three kinds of stiffened steel pipes with different stiffeners arrangements and one specimen of steel pipe without stiffners were designed according to the needs of a large span transmission tower, each type has three specimens, in total twelve; then, the residual stress of these specimens was tested by the blind hole method. The results show that the residual stress field of the stiffened steel pipe can be taken as the superposition of the residual stress field induced by the butt-jointed weld seam of the steel pipe and the residual stress field induced by the fillet weld seam of stiffners. The stress field has the following characteristics: the peak value and its position of the residual tensile stress of the stiffened steel pipe are basically the same as those of the steel pipe without stiffeners; the peak value of the residual compressive stress of the stiffened steel pipe is greater than that of the steel pipe without stiffeners, and the peak value position of the residual compressive stress will change greatly; there is obvious residual tensile stress at the stiffners of stiffened steel pipe, but the residual tensile stress is significantly lower than that of the butt-jointed weld seam of the steel pipe.

Keywords:blind hole method; stiffened steel pipe; residual stress; weld seam; large span transmission tower

*国家自然科学基金项目（51408569）。

作者简介：刘海锋,博士,高级工程师,Email:oceanlhf@163.com。