建筑钢结构进展2026，Vol.28Issue(3)：124-134,11.DOI:10.13969/j.jzgjgjz.20250429002
基于激光扫描的轻型模块柱初始缺陷分析及轴压稳定性能研究
Initial Imperfection and Axial Compression Stability of Lightweight Modular Columns Based on Laser Scanning
摘要
Abstract
Lightweight modular steel structures commonly use asymmetric cold-formed thin-walled steel columns,of which the axial compression bearing performance is significantly influenced by initial geometric imperfections.In this paper,full-scale axial compression tests are conducted on commonly used asymmetric cold-formed thin-walled single columns in lightweight modular steel structures,as well as on assembled columns combining long-limb and short-limb sections with practical end bolted connections,and the influence of initial geometric imperfection is also analyzed.Before testing,high-precision 3D laser scanning technology was utilized to measure the geometric morphology of modular columns before and after installation,to extract initial imperfection characteristics and obtain geometric elevation deviations.Reverse reconstruction modeling,which transforms scanned point cloud models into finite element models,was applied to introduce actual initial imperfections.An improved modal method was also proposed,and the results were compared with models using traditional imperfection involvement method.The results indicate that the initial imperfections of open-section cold-formed thin-walled modular columns can be categorized into three distinct types.The axial compression failure modes under practical installation boundary primarily involve global flexural-torsional buckling triggered by bending deformation of the long-limb plates.Comparative analysis demonstrates that the reverse reconstruction modeling method effectively predicts both the failure modes and bearing capacity of modular columns.Furthermore,the improved modal method exhibits higher accuracy in bearing capacity prediction compared to traditional approaches.关键词
模块化钢结构/轴压承载性能/初始几何缺陷/激光扫描/扫描点云模型/逆向重构建模方法/改进模态法Key words
modular steel building/axial compression performance/initial geometrical imperfection/laser scanning/scanned point cloud model/reverse reconstruction modeling method/improved modal method分类
建筑与水利引用本文复制引用
余玉洁,陈思凡,王霄翔,张艺川,蒋丽忠,杨志刚,白金州..基于激光扫描的轻型模块柱初始缺陷分析及轴压稳定性能研究[J].建筑钢结构进展,2026,28(3):124-134,11.基金项目
国家自然科学基金(52278231),湖南省自然科学基金(2023JJ40270),湖南省科技创新计划(2023RC3038,2022RC1185) （52278231）
