A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
DSM design of fixed-ended slender built-up back-to-back cold-formed steel compression members
Abstract Built-up back-to-back cold-formed steel channel (BC) sections have gained increased application as compression members in building structures. Although many researchers have studied the behaviour and design of BC compression members, the design equations in the current standards are still inadequate for them, while the new design equations proposed in recent studies are inconsistent and lead to predictions with varying accuracy. This study focuses on slender BC members with fixed ends, which are sensitive to local-global interaction or global buckling. Many tests of fixed-ended slender channel and BC compression members, which failed mostly by local-global interaction buckling, were conducted first, followed by developing validated finite element models. The models were then used in a parametric study of BC compression members with varying sections, screw arrangements and lengths, to investigate their failures by local-global interaction and global buckling. The outcomes from tests and finite element analyses provided improved understanding of the behaviour of BC members, and were used to compare their compression capacities against twice the individual member capacities, and show the limitations of the current design equations available in the standards and research publications. Finally, reliable design guidelines were proposed using the Direct Strength Method (DSM).
Graphical abstract Display Omitted
Highlights Investigated built-up back-to-back channel (BC) members failing by global or local-global interaction buckling. BC members are not subject to torsional and flexural-torsional buckling modes. BC members' capacities for global or local-global interaction buckling can be higher than the sum of individual capacities. Effects of screw fastener connections and their arrangements are considerable. Proposed reliable design guidelines based on the current DSM and recommended suitable maximum screw spacing.
DSM design of fixed-ended slender built-up back-to-back cold-formed steel compression members
Abstract Built-up back-to-back cold-formed steel channel (BC) sections have gained increased application as compression members in building structures. Although many researchers have studied the behaviour and design of BC compression members, the design equations in the current standards are still inadequate for them, while the new design equations proposed in recent studies are inconsistent and lead to predictions with varying accuracy. This study focuses on slender BC members with fixed ends, which are sensitive to local-global interaction or global buckling. Many tests of fixed-ended slender channel and BC compression members, which failed mostly by local-global interaction buckling, were conducted first, followed by developing validated finite element models. The models were then used in a parametric study of BC compression members with varying sections, screw arrangements and lengths, to investigate their failures by local-global interaction and global buckling. The outcomes from tests and finite element analyses provided improved understanding of the behaviour of BC members, and were used to compare their compression capacities against twice the individual member capacities, and show the limitations of the current design equations available in the standards and research publications. Finally, reliable design guidelines were proposed using the Direct Strength Method (DSM).
Graphical abstract Display Omitted
Highlights Investigated built-up back-to-back channel (BC) members failing by global or local-global interaction buckling. BC members are not subject to torsional and flexural-torsional buckling modes. BC members' capacities for global or local-global interaction buckling can be higher than the sum of individual capacities. Effects of screw fastener connections and their arrangements are considerable. Proposed reliable design guidelines based on the current DSM and recommended suitable maximum screw spacing.
DSM design of fixed-ended slender built-up back-to-back cold-formed steel compression members
Vy, Son Tung (author) / Mahendran, Mahen (author)
2021-11-11
Article (Journal)
Electronic Resource
English
Design of Fixed-ended Cold-Formed Steel Plain Angle Compression Members
| British Library Conference Proceedings | 2004
Design of Cold-Formed Steel Back-To-Back Connected Built-up Beams
| Elsevier | 2021