Crossarm length optimization and post-buckling analysis of prestressed stayed steel columns. (November 2019)

• Record Type: Journal Article
• Authors: Wang, Hao; Li, Pengcheng; Wu, Minger
• Is Part Of: Thin-walled structures. Volume 144(2019)
• Publication Date: 2019-11
• Subjects: Prestressed stayed column -- Optimization -- Post-buckling -- MATLAB -- Numerical analysis; Thin-walled structures -- Periodicals; 690.1
• DOI: 10.1016/j.tws.2019.106371
• Languages: English
• ISSNs: 0263-8231

Abstract

Abstract: A prestressed stayed steel column is an efficient and lightweight method of enhancing the stability of a traditional compression steel column. In the past, a large number of repeated numerical analyses had to be conducted to determine the optimal crossarm length of a structural system. This motivates the study of an optimization method that can be adopted to determine the optimal crossarm length directly. A sensitivity analysis of the linear buckling load is carried out based on the finite element theory, and an optimization algorithm is adopted to capture the optimal crossarm length. The optimization method is programmed in MATLAB and validated by numerical analysis. The post-buckling behavior of prestressed stayed steel columns with different crossarm arrangement schemes is also comparatively analyzed. It is demonstrated that the proposed optimization method is sufficiently accurate to predict an optimal crossarm length that corresponds to the maximum buckling load. The results presented in this study should be of great assistance in updating design procedures for prestressed stayed steel columns. Highlights: A novel optimization method of determining the optimal crossarm length of prestressed stayed steel columns is proposed. The characteristic of the buckling mode corresponds to the optimal crossarm length is demonstrated. Imperfection sensitivity analysis of prestressed stayed steel column with optimal crossarm lengths is conducted.