摘要
激光熔覆作为一种加固修复技术,具有熔覆层力学性能优异、熔覆层与基材界面性能良好等优势,为了研究铁基粉末激光熔覆层的力学性能,首先开展了不同取件方向角和厚度的铁基粉末激光熔覆层单轴拉伸试验,然后分别对无损钢管柱、端部腐蚀钢管柱、激光熔覆修复后钢管柱进行轴压试验,评估其修复效果;并采用ABAQUS软件建立了激光熔覆修复局部腐蚀圆钢管柱的有限元模型,将限元分析结果与试验结果对比,开展有限元参数分析。结果表明:铁基粉末激光熔覆层力学性能良好,适合应用于修复加固端部腐蚀Q345圆钢管柱;采用铁基粉末激光熔覆修复后圆钢管柱的刚度、承载力、延性和几何尺寸可恢复到未腐蚀前的水平;参数分析发现,当熔覆材料强度大于母材强度时,端部腐蚀区域深度对修复后圆钢管柱轴压力学性能影响较小,端部腐蚀区高度的增加可使承载能力有略微提升。
Laser cladding(LC),as a reinforcement and repair technology,offers advantages such as excellent mechanical properties of the cladded layer and good interface performance between the cladded layer and the substrate.To investigate the mechanical properties of LC sheets made from iron-based powder,unixal tensile tests were conducted on tensile coupons with varying material directional angles and thicknesses.Axial compression tests were conducted on intact circular steel tubes,end-corroded circular steel tubes,and end-corroded circular steel tube columns repaired by LC.The repair effectiveness was assessed using the test outcomes.Additionally,a finite element model of endcorroded circular steel tubes repaired by LC was developed using ABAQUS software,and the results of the finite element analysis were compared with the experimental results.Finally,a parametric analysis was conducted.The research findings demonstrate that the LC sheet made from iron-based powder possesses favorable mechanical properties and is well-suited for repairing and reinforcing corroded Q345 circular steel tubes.The stiffness,bearing capacity,ductility and dimensional stability of the circular steel tubes repaired by LC using iron-based powder can be restored to levels comparable to those of the uncorroded specimens.Through parametric analysis,it is found that,when the strength of LC sheet is larger than that of base metal,the depth of the end corrosion area has little effect on the axial compressional performance of the circular steel tube column repaired by LC.Additionally,an increase in the height of the end corrosion zone slightly enhances the bearing capacity of the repaired specimens.
作者
康澜
陈锋
张彬
KANG Lan;CHEN Feng;ZHANG Bin(State Key Laboratory of Subtropical Building and Urban Science,South China University of Technology,Guangzhou 510640,China;School of Civil Engineering and Transportation,South China University of Technology,Guangzhou 510640,China)
出处
《建筑结构学报》
CSCD
北大核心
2024年第S2期376-385,共10页
Journal of Building Structures
基金
国家自然科学基金项目(52178286,52478313)
亚热带建筑与城市科学全国重点实验室(2022KB14)
关键词
端部腐蚀圆钢管
激光熔覆
轴压性能
X-FeSP612铁基粉
end-corroded circular steel tube column
laser cladding
compressive behavior
X-FeSP612 ironbased powder
