正交实验法薄壁压杆截面稳定性的优化

Section stability optimum of thin-walled compressive bar on orthogonal experimental method

针对薄壁结构在工程中失稳破坏的问题,采用ANSYS软件对薄壁压杆双重非线性稳定进行分析,以薄壁压杆工字形截面尺寸为稳定极限载荷的影响因子,通过正交实验方法设计实验,得到了各个因子影响的显著性。翼缘宽度对稳定极限载荷的影响最大,翼缘厚度次之。最后依据多元线性回归原理建立了薄壁压杆稳定数学模型并对截面进行了优化设计,稳定极限载荷提高了30%。

Abstract：Aimed at removing instability and failure associated with thin-walled compressive bar in engineering, this paper features appreciable impact of each factors, based on orthogonal experimental method and by analyzing the bi-nonlinear stability of thin-walled compressive bar, selecting sectional di- mension of I-shaped cross-section as factors of ultimate load of thin-walled compressive bar, and perform- ing the orthogonal experimental design. Flange width exerts the greatest effect on stability ultimate loads, followed by flange thickness. The paper ends with the development of mathematic model of thin-walled compressive bar by multiple linear regression theory and design of section optimum, thus giving a 30%. increase in section and ultimate load.