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Local and post-local buckling behavior of welded steel shapes in partially encased composite columns
Abstract This paper presents a theoretical study on both local and post-local buckling behaviors of partially encased composite (PEC) columns, made with thin-walled, welded H-shapes and concrete encasement between flanges; transverse links are welded between flange tips to reinforce the section. Nonlinear finite element analysis (FEA) was conducted to predict buckling behaviors and strengths of steel shapes. Finite element models were verified through a comparison of FEA results with experimental results. A parametric study was then performed using validated FEA models to investigate the effect of several parameters on the buckling behavior of PEC columns. The residual stress of steel shapes, which is introduced through welding process, was discussed in detail. Based on the parametric study, a series of expressions was developed for predicting critical strength, post-buckling strength, as well as the entire stress-strain relationship of steel shapes in PEC columns under concentric loading.
Graphical abstract Display Omitted
Highlights FE models for partially encased composite (PEC) columns are developed and verified. Failure mechanism of steel elements in PEC columns is revealed. Factors affect buckling and post-buckling behavior of steel flanges are investigated. Formulas of critical and post-buckling stresses are proposed. Expressions for stress-strain relationship are developed.
Local and post-local buckling behavior of welded steel shapes in partially encased composite columns
Abstract This paper presents a theoretical study on both local and post-local buckling behaviors of partially encased composite (PEC) columns, made with thin-walled, welded H-shapes and concrete encasement between flanges; transverse links are welded between flange tips to reinforce the section. Nonlinear finite element analysis (FEA) was conducted to predict buckling behaviors and strengths of steel shapes. Finite element models were verified through a comparison of FEA results with experimental results. A parametric study was then performed using validated FEA models to investigate the effect of several parameters on the buckling behavior of PEC columns. The residual stress of steel shapes, which is introduced through welding process, was discussed in detail. Based on the parametric study, a series of expressions was developed for predicting critical strength, post-buckling strength, as well as the entire stress-strain relationship of steel shapes in PEC columns under concentric loading.
Graphical abstract Display Omitted
Highlights FE models for partially encased composite (PEC) columns are developed and verified. Failure mechanism of steel elements in PEC columns is revealed. Factors affect buckling and post-buckling behavior of steel flanges are investigated. Formulas of critical and post-buckling stresses are proposed. Expressions for stress-strain relationship are developed.
Local and post-local buckling behavior of welded steel shapes in partially encased composite columns
Song, Yu-Chen (author) / Wang, Ren-Peng (author) / Li, Jie (author)
Thin-Walled Structures ; 108 ; 93-108
2016-08-02
16 pages
Article (Journal)
Electronic Resource
English
Local and post-local buckling behavior of welded steel shapes in partially encased composite columns
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