Design of High-Strength Polygonal Cold-Formed Steel Built-Up Sections Using the Direct Strength Method
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Sakpunpanom, Korawat
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Abstract
Cold-formed steel (CFS) structural members, which are increasingly important in building
construction, offer numerous shapes and are created through roll-forming machines or
bending processes. Advancements in metallurgy, particularly the development of high
-strength low-alloy (HSLA) sheet with a minimum yield strength of 100 ksi (690 Mpa),
have further expanded the use of cold-formed sections in lightweight and advanced
structural applications, such as in the solar energy industry.
Despite their benefits, cold-formed sections are susceptible to cross-sectional
instabilities like local and distortional buckling, which reduce their ultimate capacity. To
enhance their strength, connecting individual sections using fasteners to create built-up
sections is advantageous. The research employs the Direct Strength Method (DSM) as a practical flexural strength prediction approach for polygonal shape built-up sections, compared to the advanced Finite Element Analysis (FEA). The predictions from both methods are also validated against the experimental program. Furthermore, the Digital Image Correlation (DIC) system is utilized to capture the buckling of the specimens during testing precisely.
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Date
2023-07-31
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