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Bending Performance of Cold-Formed Thick-Walled Rectangular Steel Beams
An increasing number of cold-formed thick-walled members are being employed in engineering structures. However, research on their bending performance is still lacking, and existing codes are primarily suitable for thin-walled steel members. Therefore, bending tests were conducted on 10 cold-formed thick-walled rectangular beams. The primary test parameters were the width, height, and thickness of the cross section. The material properties, initial geometric imperfections, failure modes, load–deflection curves, ultimate loads, rotation capacities, and load–strain curves of these beams were analyzed. Subsequently, a nonlinear finite-element (FE) model of cold-formed thick-walled rectangular beams was developed. After validating the numerical model with the test results, a parametric study was conducted. The results revealed that the height-to-width, radius-to-thickness, and width-to-thickness ratios significantly affected the plastic development ability of the cross section. With the increase in height-to-width and radius-to-thickness ratios, an existing Chinese design code yielded unsafe limits for the width-to-thickness ratio. Based on the parametric study results, width-to-thickness ratio limits suitable for cold-formed thick-walled cross sections were recommended. Finally, a simplified design method for the bending resistance of cold-formed thick-walled rectangular beams was proposed and validated using experimental and FE model results.
Bending Performance of Cold-Formed Thick-Walled Rectangular Steel Beams
An increasing number of cold-formed thick-walled members are being employed in engineering structures. However, research on their bending performance is still lacking, and existing codes are primarily suitable for thin-walled steel members. Therefore, bending tests were conducted on 10 cold-formed thick-walled rectangular beams. The primary test parameters were the width, height, and thickness of the cross section. The material properties, initial geometric imperfections, failure modes, load–deflection curves, ultimate loads, rotation capacities, and load–strain curves of these beams were analyzed. Subsequently, a nonlinear finite-element (FE) model of cold-formed thick-walled rectangular beams was developed. After validating the numerical model with the test results, a parametric study was conducted. The results revealed that the height-to-width, radius-to-thickness, and width-to-thickness ratios significantly affected the plastic development ability of the cross section. With the increase in height-to-width and radius-to-thickness ratios, an existing Chinese design code yielded unsafe limits for the width-to-thickness ratio. Based on the parametric study results, width-to-thickness ratio limits suitable for cold-formed thick-walled cross sections were recommended. Finally, a simplified design method for the bending resistance of cold-formed thick-walled rectangular beams was proposed and validated using experimental and FE model results.
Bending Performance of Cold-Formed Thick-Walled Rectangular Steel Beams
J. Struct. Eng.
Men, Pengfei (author) / Di, Jin (author) / Qin, Fengjiang (author) / Wang, Kunjiao (author) / Wang, Jie (author) / Peng, Xi (author)
2024-12-01
Article (Journal)
Electronic Resource
English
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