摘要
残余应力是影响输电铁塔大规格角钢构件整体稳定性能的重要因素。大规格角钢肢长一般超过200 mm,其残余应力分布受增大的尺寸影响,这与普通角钢有较大差异。为研究考虑焊接端板影响的Q420大规格角钢残余应力分布,采用盲孔法分别测量了带焊接端板的■300×30非镀锌和镀锌热轧角钢的残余应力。基于测得的角钢纵向、横向残余应力数据,研究镀锌、离焊缝距离等因素对纵、横向残余应力分布的影响,并得出大规格角钢焊接端板构件的残余应力分布规律。结果表明:纵、横向残余应力随着与端板焊缝距离的增大而呈现减小、增大交替的波浪式起伏变化;镀锌降低了残余应力幅值,使残余应力分布趋于平缓;在焊接和轧制残余应力的共同作用下,使角钢两肢的残余应力分布更为复杂。通过分析端部焊缝影响下非镀锌和镀锌热轧角钢的残余应力分布规律,评估了端部焊缝和镀锌等因素的影响,以期为进一步研究此类构件的力学性能提供参考。
Residual stress is one of the most important factors for stability of large-section angles applied in transmission tower projects.The leg length of large-section angle almost exceeds 200 mm,due to which the residual stress distribution may differ greatly from normal sections.An experimental study on the residual stress of L300×30 large-section angles with and without galvanization was conducted with hole-drilling method.Based on the obtained distributions of welding longitudinal and transverse residual stresses,the influences of galvanizing and the distance to welding seam on distribution of longitudinal and transverse residual stresses were studied.The patterns of residual stress distribution of large section angles with welding end-plate were achieved.It is indicated that the distribution of welding residual stress exhibits a wave variation with the increasing distance to welding seam,and the galvanizing decreases the maximum residual stress amplitude,leading to a gentle distribution curve.The residual stress distribution law of hot-rolled angles with and without galvanization was investigated,and the effects of welds and galvanizing process were also assessed,providing references for future analysis on the performance of the large section angles.
作者
施刚
张紫千
陈学森
高源
SHI Gang;ZHANG Ziqian;CHEN Xuesen;GAO Yuan(Key Laboratory of Civil Engineering Safety and Durability of China Education Ministry,Tsinghua University,Beijing 100084,China;Beijing Engineering Research Center of Steel and Concrete Composite Structures,Tsinghua University,Beijing 100084,China;Beijing Engineering Research Centre of High-rise and Large-span Prestressed Steel Structures,Beijing University of Technology,Beijing 100124,China;China Architecture Design&Research Group,Beijing 100044,China)
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2020年第S02期374-381,共8页
Journal of Building Structures
基金
国家自然科学基金项目(51978416,51778328)
关键词
钢结构
大规格角钢
镀锌
盲孔法
残余应力
steel structure
large-section angle
galvanization
hole-drilling method
residual stress
