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针对单肢C形和U形截面及由其拼合而成的双肢和四肢截面冷弯薄壁型钢柱轴压承载力,进行了66根(共6种截面,5种长度)两端铰接的多肢拼合截面冷弯薄壁型钢柱轴压试验,研究了长细比、肢数及拼合形式对冷弯薄壁型钢多肢拼合柱轴压受力性能的影响。试验结果表明:长细比小于70的开口截面易发生畸变屈曲,闭口截面则发生局部屈曲;长细比大于70的试件则以整体屈曲破坏为主;随着试件的长度增加,其轴压承载力逐渐降低。相对于单肢截面,相同高度的拼合截面长细比减小,试件破坏形式随着长细比减小而从整体屈曲控制变为畸变屈曲和局部屈曲控制,轴压承载力提高。试验结果为多肢拼合截面柱设计计算提供了试验数据支持。
Aiming at the single-limb C-shape and U-section and the axial compressive bearing capacity of cold-formed and thin-wall steel columns with double-limbs and four-limbs combined by them, 66 ends (6 sections in total, 5 lengths) The effects of the slenderness ratio, the number of the limbs and the type of splitting on the axial compression behavior of cold-formed thin-wall steel multi-limb split column were studied. The test results show that the deformation of the open section is prone to distorted buckling when the slenderness ratio is less than 70 and the local buckling occurs at the closed cross section. The specimen with a slenderness ratio greater than 70 is mainly subjected to total buckling failure. As the length of the specimen increases, Pressure bearing capacity gradually decreased. Compared with the single-limb cross-section, the slenderness ratio at the same height decreases, and the failure form of the specimen changes from integral buckling control to distorted buckling and local buckling control with the slenderness ratio decreasing, and the axial compressive bearing capacity increases. The test results provide experimental data support for the design and calculation of multi-limbed section columns.