Effect of Stiffeners on the Axial Strength of Face-to-Face Unequal-Angle Cold-Formed Steel Columns
Cold-formed steel (CFS) unsymmetrical angles are increasingly used in structural applications such as portal frames, roof trusses, and transmission towers. However, research on built-up face-to-face unsymmetrical CFS angle columns (FFUACs) with stiffeners remains limited. This study addresses this g...
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MDPI AG
2024-12-01
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| Online Access: | https://www.mdpi.com/2075-5309/15/1/88 |
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| author | Beulah Gnana Ananthi Gurupatham Krishanu Roy James Boon Piang Lim |
| author_facet | Beulah Gnana Ananthi Gurupatham Krishanu Roy James Boon Piang Lim |
| author_sort | Beulah Gnana Ananthi Gurupatham |
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| description | Cold-formed steel (CFS) unsymmetrical angles are increasingly used in structural applications such as portal frames, roof trusses, and transmission towers. However, research on built-up face-to-face unsymmetrical CFS angle columns (FFUACs) with stiffeners remains limited. This study addresses this gap by presenting the findings from six experimental investigations on intermediate FFUACs connected using intermittent screw fasteners. The results offer insights into failure deformation patterns and load-axial shortening behaviour. A nonlinear finite element (FE) model was developed to account for material and geometric nonlinearity, with experimental results used for validation. This study contributes 166 new data points, including six experimental tests under concentric compression and 160 finite element analysis (FEA) results focused on the compressive strength of FFUACs. Additionally, this study evaluates the performance of existing design guidelines based on the direct strength method (DSM). The DSM strength predictions were found to be less conservative for stub FFUAC specimens that failed due to local buckling and more conservative for short FFUAC specimens that failed due to a combination of local and flexural buckling. A revised DSM methodology is proposed to address these discrepancies. |
| format | Article |
| id | doaj-art-994f6c9f11f54aa18ef659498b0d7915 |
| institution | Kabale University |
| issn | 2075-5309 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | MDPI AG |
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| series | Buildings |
| spelling | doaj-art-994f6c9f11f54aa18ef659498b0d79152025-01-10T13:16:00ZengMDPI AGBuildings2075-53092024-12-011518810.3390/buildings15010088Effect of Stiffeners on the Axial Strength of Face-to-Face Unequal-Angle Cold-Formed Steel ColumnsBeulah Gnana Ananthi Gurupatham0Krishanu Roy1James Boon Piang Lim2Department of Civil Engineering, Anna University, Chennai 600 025, IndiaSchool of Engineering, The University of Waikato, Hamilton 3216, New ZealandSchool of Engineering, The University of Waikato, Hamilton 3216, New ZealandCold-formed steel (CFS) unsymmetrical angles are increasingly used in structural applications such as portal frames, roof trusses, and transmission towers. However, research on built-up face-to-face unsymmetrical CFS angle columns (FFUACs) with stiffeners remains limited. This study addresses this gap by presenting the findings from six experimental investigations on intermediate FFUACs connected using intermittent screw fasteners. The results offer insights into failure deformation patterns and load-axial shortening behaviour. A nonlinear finite element (FE) model was developed to account for material and geometric nonlinearity, with experimental results used for validation. This study contributes 166 new data points, including six experimental tests under concentric compression and 160 finite element analysis (FEA) results focused on the compressive strength of FFUACs. Additionally, this study evaluates the performance of existing design guidelines based on the direct strength method (DSM). The DSM strength predictions were found to be less conservative for stub FFUAC specimens that failed due to local buckling and more conservative for short FFUAC specimens that failed due to a combination of local and flexural buckling. A revised DSM methodology is proposed to address these discrepancies.https://www.mdpi.com/2075-5309/15/1/88face-to-facebuilt-up unequal-angle sectionscold-formed steelaxial strengthlocal bucklingflexural buckling |
| spellingShingle | Beulah Gnana Ananthi Gurupatham Krishanu Roy James Boon Piang Lim Effect of Stiffeners on the Axial Strength of Face-to-Face Unequal-Angle Cold-Formed Steel Columns Buildings face-to-face built-up unequal-angle sections cold-formed steel axial strength local buckling flexural buckling |
| title | Effect of Stiffeners on the Axial Strength of Face-to-Face Unequal-Angle Cold-Formed Steel Columns |
| title_full | Effect of Stiffeners on the Axial Strength of Face-to-Face Unequal-Angle Cold-Formed Steel Columns |
| title_fullStr | Effect of Stiffeners on the Axial Strength of Face-to-Face Unequal-Angle Cold-Formed Steel Columns |
| title_full_unstemmed | Effect of Stiffeners on the Axial Strength of Face-to-Face Unequal-Angle Cold-Formed Steel Columns |
| title_short | Effect of Stiffeners on the Axial Strength of Face-to-Face Unequal-Angle Cold-Formed Steel Columns |
| title_sort | effect of stiffeners on the axial strength of face to face unequal angle cold formed steel columns |
| topic | face-to-face built-up unequal-angle sections cold-formed steel axial strength local buckling flexural buckling |
| url | https://www.mdpi.com/2075-5309/15/1/88 |
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