不锈钢轴心受压柱弯曲屈曲承载力分析

为给我国《不锈钢结构技术规范》中轴心受压柱弯曲屈曲稳定部分的编制提供依据，对国外已有的同类构件的设计方法和试验研究数据进行搜集和对比。结果表明：目前的欧洲不锈钢结构设计规范和美国冷成型不锈钢结构设计规范中计算该类构件的公式均存在一定不足。依据搜集到的199个方管、矩形管、圆管、椭圆管、焊接H形钢和冷弯C型钢截面柱的试验数据，根据冷弯效应及残余应力对轴心受压构件稳定性能的影响，将构件依据截面形式分为A、B、C三类，其中方管、矩形管和冷弯C型钢为A类，圆管和椭圆管为B类，焊接H形钢为C类，三类轴心受压稳定曲线均采用Perry公式形式表达。与试验数据对比表明：采用三类曲线能较好地估算构件的稳定承载力且离散性较小。对提出的计算式进行可靠度分析，结果表明其可靠度指标β满足我国GB 50068-2001《建筑结构可靠度设计统一标准》的要求。

Study on flexural stability of stainless steel columns under axial loading

The objective of this paper is to provide a basis about columns failure in flexural buckling for the first version of design code for stainless steel in China. Design methods and test data on stainless steel columns were collected and compared. The comparisons indicate that deficiencies exist both in European code and American code for stainless steel members. Based on the test data collected on stainless steel square, rectangular, circular and oval hollow sections, welded-H sections and lipped-C sections, three design curves (A, B, C) were developed according to the influences of cold-forming and residual stress to the performance of stainless steel columns. These curves were all expressed in Perry equation with different imperfect parameters. Columns with cold-formed square, rectangular hollow section and lipped-C section were included in A. Columns with circular and oval hollow section were sorted into B. Columns with welded-H section were separated into C. Comparisons with test data indicate that predications of these design curves can fit the test data well with low scatter. Reliability analysis was conducted according to reliability design code of China. The reliability indexβis higher than the demand of the code.