冷弯薄壁三次卷边槽钢轴压开孔立柱承载力的研究.doc

冷弯薄壁三次卷边槽钢轴压开孔立柱承载力的研究 　　摘要：对冷弯薄壁三次卷边槽钢轴压开孔短柱进行试验研究，并采用有限元软件ANSYS进行计算，对比分析了ANSYS、中国规范和北美规范的计算结果以及开孔对立柱承载能力的影响。研究结果表明：冷弯薄壁三次卷边槽钢轴压开孔立柱的破坏模式均出现畸变屈曲；中国规范有效截面法间接计入了畸变屈曲的影响，与北美规范计算结果吻合良好；开孔明显降低了立柱的承载能力，且变化规律与工程中常规轴心受压构件不符，对于冷弯薄壁三次卷边槽钢承载力的开孔折减在设计中应予以足够的重视，其开孔折减系数对于文中截面可取为K=2.41×10-5λ2-3.78×10-3λ+9.59×10-2。 　　关键词：冷弯薄壁三次卷边槽钢；开孔立柱；短柱试验；轴向承载力；畸变屈曲 　　中图分类号：TU394 　　文献标志码：A 　　文章编号：1674-4764（2013）03-0081-07 　　Analysis of Axial Bearing Capacity of Three Times Cold-formed 　　Thin-walled Lipped Channel Column with Holes 　　Yin Lingfeng1，Xu Zhenglin2 ，Huang Hui1，Hong Dangping3，Tang Gan1 　　（1. Key laboratory of concrete and pre-stressed concrete structures of the Ministry of Education， Southeast University， 　　Nanjing 210096， P. R. China； 2. Jiangsu Nova Logistics System Co.， Ltd， Nanjing 210019， P.R. China； 　　3. Jiangxi Province Architectural Design Research General Institute System， Nanchang 330046 Jiangxi， P. R. China） 　　Abstract： 　　Axial bearing capacity of three times cold-formed thin-walled lipped channel short column with holes was studied and calculated by finite element software ANSYS. The comparative analysis was carried out to the ANSYS， Chinese code and North America code to make out the influence of hole on the bearing capacity of the column. The results show that distortional buckling appears in the failure mode of axial compression column. Effective width method in Chinese code indirectly considers the impact of distortional buckling， and it has a good agreement with the results of North America code. Holes obviously decrease the axial bearing capacity of the column， and the variation is not according with conventional axial compression member. Opening reduction to the carrying capacity of three times cold-formed thin-walled lipped channel should be emphasised in design. Reduction factor can be taken as K=2.41×10-5λ2-3.78×10-3λ+9.59×10-2 to cross-section of the article. 　　Key words： 　　three times cold-formed thin-walled lipped channel； column with holes； t