钢结构模块建筑非对称冷弯薄壁型钢柱轴压承载性能研究

Research on Axial Compression Bearing Performance of Asymmetric Cold-formed Thin-walled Steel Columns in Modular Steel Buildings

随着建筑工业化进程加快,钢结构模块建筑得到快速发展,其中低多层钢模块建筑常采用冷弯薄壁轻钢结构体系。对轻型模块柱常用的非对称冷弯薄壁“C”型单柱,以及常见的长肢拼合、短肢拼合和四肢拼合模式下的组合模块柱开展了模拟实际拼接边界条件的轴压试验研究,得到了模块柱的初始缺陷特征、轴压失效模式和承载性能。轻型模块柱初始缺陷主要体现为外伸肢的向内或向外鼓曲变形;轴压承载时均产生外伸长肢的弯曲变形,进而引发轻型模块柱产生弯扭失稳破坏;长肢拼合柱轴向承载性能最弱,且外伸长肢的稳定性能为影响模块柱轴压性能的主要因素。该结论可为钢结构模块建筑中轻钢模块柱的承载力设计计算及构造设计提供重要参考。

With the advancement of building industrialization,modular steel buildings have received fast developments.The low to midrise steel modular buildings commonly use cold-formed thin-walled light steel systems.This paper introduces an axial compression experimental study of asymmetric cold-formed thin-walled modular columns that commonly used in lightweight modular buildings,including the C-shaped single column,long-limb splicing column,short-limb splicing column,and the four-limb splicing modular column.The columns were tested under simulated actual assembly boundary conditions.The study investigated the initial imperfection characteristics,axial compression failure modes,and bearing performance of these columns.The initial imperfection of light modular columns were mainly inward or outward bulging deformation of the extended limbs.Under axial compression,the extended long limbs presented obvious bending deformation,which subsequently leaded to flexural-torsional instability failure of the light modular columns.Among test specimens,the long-limb spliced column exhibited the weakest axial load-bearing performance.The stability performance of the extended long limbs is identified as the main influencing factor on the axial compression performance of modular columns.The research can provide important reference for the bearing capacity calculation and structural design of lightweight steel columns in modular steel buildings.