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On the direct strength design of cold-formed steel columns failing in local-distortional interactive modes
AbstractThis paper present and discusses proposals for the codification of efficient design approaches for cold-formed steel columns affected by local-distortional (L-D) interaction. These proposals, based on the Direct Strength Method (DSM), were developed, calibrated and validated on the basis of experimental and numerical (shell finite element) failure load data concerning columns with several cross-section shapes (plain, web-stiffened and web-flange-stiffened lipped channels, hat-sections, zed-sections and rack-sections) and obtained from investigations carried out by various researchers. Three types of L-D interaction are taken into account, namely “true L-D interaction”, “secondary-local bifurcation L-D interaction” and “secondary-distortional bifurcation L-D interaction”. Moreover, previously available DSM-based design approaches developed to handle column L-D interactive failures are reviewed and their merits are assessed and compared with those exhibited by the present proposals. The paper also presents reliability assessments of the failure load predictions provided by the available and proposed DSM-based design approaches, following the procedure prescribed by the current version of the North American Specification for the Design of Cold-Formed Steel Structural Members.
HighlightsDSM-based codification of the design of cold-formed steel columns undergoing L-D interaction is addressed.Experimental and numerical column failure loads associated with L-D interactive failure are collected.The DSM-based design proposals cover columns experiencing three different types of L-D interaction.Available DSM-based design approaches for column L-D interaction are reviewed and their merits assessed.Reliability assessment of the predictions provided by the available/proposed design approaches is performed.
On the direct strength design of cold-formed steel columns failing in local-distortional interactive modes
AbstractThis paper present and discusses proposals for the codification of efficient design approaches for cold-formed steel columns affected by local-distortional (L-D) interaction. These proposals, based on the Direct Strength Method (DSM), were developed, calibrated and validated on the basis of experimental and numerical (shell finite element) failure load data concerning columns with several cross-section shapes (plain, web-stiffened and web-flange-stiffened lipped channels, hat-sections, zed-sections and rack-sections) and obtained from investigations carried out by various researchers. Three types of L-D interaction are taken into account, namely “true L-D interaction”, “secondary-local bifurcation L-D interaction” and “secondary-distortional bifurcation L-D interaction”. Moreover, previously available DSM-based design approaches developed to handle column L-D interactive failures are reviewed and their merits are assessed and compared with those exhibited by the present proposals. The paper also presents reliability assessments of the failure load predictions provided by the available and proposed DSM-based design approaches, following the procedure prescribed by the current version of the North American Specification for the Design of Cold-Formed Steel Structural Members.
HighlightsDSM-based codification of the design of cold-formed steel columns undergoing L-D interaction is addressed.Experimental and numerical column failure loads associated with L-D interactive failure are collected.The DSM-based design proposals cover columns experiencing three different types of L-D interaction.Available DSM-based design approaches for column L-D interaction are reviewed and their merits assessed.Reliability assessment of the predictions provided by the available/proposed design approaches is performed.
On the direct strength design of cold-formed steel columns failing in local-distortional interactive modes
Dias Martins, André (author) / Camotim, Dinar (author) / Borges Dinis, Pedro (author)
Thin-Walled Structures ; 120 ; 432-445
2017-06-22
14 pages
Article (Journal)
Electronic Resource
English
DSM Design of Cold-Formed Steel Columns Failing in Distortional Modes at Elevated Temperatures
| Online Contents | 2018
DSM Design of Cold-Formed Steel Columns Failing in Distortional Modes at Elevated Temperatures
| Springer Verlag | 2018