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Distortional buckling behavior of axially loaded cold-formed steel built-up I-section columns
Abstract This paper presents a comprehensive experimental program in which the distortional buckling behavior of cold-formed steel built-up I-section columns with two different cross-sectional dimensions and three different screw spacings was investigated. In total, the results from 24 experimental tests, including 18 built-up I-section columns and 6 lipped channel section columns, were tested between fix-ended conditions. Material properties, geometrical cross-sectional dimensions, and initial imperfections for all test specimens were measured during tests. The experiments aim to quantify buckling behavior, failure deformation, assembly effect, and ultimate strength for built-up I-section columns. Nonlinear finite element models were established and the accuracy of the model was verified by experiments. Additionally, a theoretical model for the distortional buckling of built-up I-section columns was proposed, and the calculation formula for the distortional buckling critical stress was given in this paper. The validated finite element model was used to carry out extensive parametric research, revealing the influence of basic parameters such as boundary condition, cross-sectional dimension, and self-drilling screw arrangement on the distortional buckling. Finally, a calculation method for the distortional buckling bearing capacity that can consider the post-buckling strength was established by substituting the calculation formula of the distortional buckling critical stress into Schafer's bearing capacity curve. The effectiveness of the proposed method was verified by comparing the computational results with the experimental results and supplementary finite element results. The comparison results show that the proposed method can be successfully used to predict the bearing capacity of built-up I-section columns affected by pure distortional buckling mode.
Highlights Axial compression tests were conducted on cold-formed steel built-up I-section columns. The distortional buckling behavior and compressive strength of columns were obtained. Nonlinear finite element models suitable for columns were established and verified. A method for predicting distortional buckling critical and ultimate load was proposed. The applicability and accuracy of the proposed method were evaluated.
Distortional buckling behavior of axially loaded cold-formed steel built-up I-section columns
Abstract This paper presents a comprehensive experimental program in which the distortional buckling behavior of cold-formed steel built-up I-section columns with two different cross-sectional dimensions and three different screw spacings was investigated. In total, the results from 24 experimental tests, including 18 built-up I-section columns and 6 lipped channel section columns, were tested between fix-ended conditions. Material properties, geometrical cross-sectional dimensions, and initial imperfections for all test specimens were measured during tests. The experiments aim to quantify buckling behavior, failure deformation, assembly effect, and ultimate strength for built-up I-section columns. Nonlinear finite element models were established and the accuracy of the model was verified by experiments. Additionally, a theoretical model for the distortional buckling of built-up I-section columns was proposed, and the calculation formula for the distortional buckling critical stress was given in this paper. The validated finite element model was used to carry out extensive parametric research, revealing the influence of basic parameters such as boundary condition, cross-sectional dimension, and self-drilling screw arrangement on the distortional buckling. Finally, a calculation method for the distortional buckling bearing capacity that can consider the post-buckling strength was established by substituting the calculation formula of the distortional buckling critical stress into Schafer's bearing capacity curve. The effectiveness of the proposed method was verified by comparing the computational results with the experimental results and supplementary finite element results. The comparison results show that the proposed method can be successfully used to predict the bearing capacity of built-up I-section columns affected by pure distortional buckling mode.
Highlights Axial compression tests were conducted on cold-formed steel built-up I-section columns. The distortional buckling behavior and compressive strength of columns were obtained. Nonlinear finite element models suitable for columns were established and verified. A method for predicting distortional buckling critical and ultimate load was proposed. The applicability and accuracy of the proposed method were evaluated.
Distortional buckling behavior of axially loaded cold-formed steel built-up I-section columns
Sang, Liurui (author) / Zhou, Tianhua (author) / Zhang, Lei (author) / Zhu, Bo (author) / Wang, Shuaibing (author)
2022-10-05
Article (Journal)
Electronic Resource
English
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