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Ultimate strength of pinned-end dual-angle cross combined section columns under axial compression
https://orcid.org/0000-0002-0215-6418
Abstract Dual-angle cross combined section columns (starred angles) have been extensively utilised as transmission tower legs because of their large bearing capacity. However, combined members may fail in different modes, and the provisions on bearing capacity in the regulations of different countries are diverse. To overcome the limitations of existing research and design approaches, a three-dimensional finite element (FE) model is developed in this study and is validated against all column test data available in the literature. Using this model, parametric analyses are performed on varying grades of steel, patterns of filler plates, and the number of filler plates, and the effect of the number and pattern of filler plates is determined. The shortcomings of the current design methods are highlighted along with the necessary solutions, based on a comparison of the results of experiments and those of numerical analysis using values calculated as per various regulatory codes. It is demonstrated that the type and the number of filler plates only affect the starred angles with flexural buckling about the imagine axis, and that torsional buckling and local buckling in the combined section columns do not occur simultaneously. When considering the influence of local buckling on the reduction in the bearing capacity of members, repeatedly factoring in torsional buckling is unnecessary. Furthermore, through modification of the slenderness ratio of the sub-members in the calculation of the equivalent slenderness ratio of starred angles, the calculation results obtained using the code agree well with the results of the numerical analysis.
Highlights Bearing capacity of starred angle with flexural imperfections about weak axis is evidently unaffected by the filler plate. The overall strengthening effect of the starred angle with CSP or CWP is more evident than for that with AP. The current specifications have good applicability when the starred angle fails by flexural buckling about the weak axis. Critical stress of the local stability is the same as the critical stress of overall torsional buckling of the starred angle.
Ultimate strength of pinned-end dual-angle cross combined section columns under axial compression
https://orcid.org/0000-0002-0215-6418
Abstract Dual-angle cross combined section columns (starred angles) have been extensively utilised as transmission tower legs because of their large bearing capacity. However, combined members may fail in different modes, and the provisions on bearing capacity in the regulations of different countries are diverse. To overcome the limitations of existing research and design approaches, a three-dimensional finite element (FE) model is developed in this study and is validated against all column test data available in the literature. Using this model, parametric analyses are performed on varying grades of steel, patterns of filler plates, and the number of filler plates, and the effect of the number and pattern of filler plates is determined. The shortcomings of the current design methods are highlighted along with the necessary solutions, based on a comparison of the results of experiments and those of numerical analysis using values calculated as per various regulatory codes. It is demonstrated that the type and the number of filler plates only affect the starred angles with flexural buckling about the imagine axis, and that torsional buckling and local buckling in the combined section columns do not occur simultaneously. When considering the influence of local buckling on the reduction in the bearing capacity of members, repeatedly factoring in torsional buckling is unnecessary. Furthermore, through modification of the slenderness ratio of the sub-members in the calculation of the equivalent slenderness ratio of starred angles, the calculation results obtained using the code agree well with the results of the numerical analysis.
Highlights Bearing capacity of starred angle with flexural imperfections about weak axis is evidently unaffected by the filler plate. The overall strengthening effect of the starred angle with CSP or CWP is more evident than for that with AP. The current specifications have good applicability when the starred angle fails by flexural buckling about the weak axis. Critical stress of the local stability is the same as the critical stress of overall torsional buckling of the starred angle.
Ultimate strength of pinned-end dual-angle cross combined section columns under axial compression
https://orcid.org/0000-0002-0215-6418
Abstract Dual-angle cross combined section columns (starred angles) have been extensively utilised as transmission tower legs because of their large bearing capacity. However, combined members may fail in different modes, and the provisions on bearing capacity in the regulations of different countries are diverse. To overcome the limitations of existing research and design approaches, a three-dimensional finite element (FE) model is developed in this study and is validated against all column test data available in the literature. Using this model, parametric analyses are performed on varying grades of steel, patterns of filler plates, and the number of filler plates, and the effect of the number and pattern of filler plates is determined. The shortcomings of the current design methods are highlighted along with the necessary solutions, based on a comparison of the results of experiments and those of numerical analysis using values calculated as per various regulatory codes. It is demonstrated that the type and the number of filler plates only affect the starred angles with flexural buckling about the imagine axis, and that torsional buckling and local buckling in the combined section columns do not occur simultaneously. When considering the influence of local buckling on the reduction in the bearing capacity of members, repeatedly factoring in torsional buckling is unnecessary. Furthermore, through modification of the slenderness ratio of the sub-members in the calculation of the equivalent slenderness ratio of starred angles, the calculation results obtained using the code agree well with the results of the numerical analysis.
Highlights Bearing capacity of starred angle with flexural imperfections about weak axis is evidently unaffected by the filler plate. The overall strengthening effect of the starred angle with CSP or CWP is more evident than for that with AP. The current specifications have good applicability when the starred angle fails by flexural buckling about the weak axis. Critical stress of the local stability is the same as the critical stress of overall torsional buckling of the starred angle.
Ultimate strength of pinned-end dual-angle cross combined section columns under axial compression
Qu, Songzhao (author) / Zhang, Bin (author) / Guo, Yonghua (author) / Sun, Qing (author) / Wang, Yi (author)
Thin-Walled Structures ; 157
2020-08-13
Article (Journal)
Electronic Resource
English
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