TY - GEN
T1 - L-D-G interaction in CFS lipped channel columns Part II: Numerical simulations and design considerations
AU - Dinis, P.B.
AU - Camotim, D.
AU - Young, Ben
PY - 2015/1/1
Y1 - 2015/1/1
N2 - ©Civil-Comp Press, 2015.This paper deals with the structural behaviour, ultimate strength and design of fixedended cold-formed steel (CFS) lipped channel columns experiencing various levels of localdistortional-global buckling mode interaction (more or less close critical local, distortional and global loads). First, a comparison between experimental results, obtained from two tests carried out at The University of Hong Kong (UHK), and the corresponding shell numerical simulations are presented and discussed - the UHK test campaign is reported in Part I of this two-part paper. The comparison (i) involves equilibrium paths, deformed configurations, failure loads and collapse mechanisms, and (ii) provides enough evidence to ensure that the numerical model developed may be deemed validated. Then, this numerical model is employed to perform a parametric study, aimed at obtaining numerical failure load data concerning lipped channel columns experiencing different levels of localdistortional-global interaction - 68 fixed-ended columns, exhibiting the same geometries of the specimens tested at UHK and various yield stresses, thus covering a wider slenderness range. Finally, this Part II paper uses the experimental failure loads reported in Part I and the numerical failure load data obtained in this work and collected from the literature to assess the quality of the ultimate strength estimates provided by various design approaches, based on the direct strength method (DSM), for cold-formed steel columns affected by the triple coupling phenomenon under consideration.
AB - ©Civil-Comp Press, 2015.This paper deals with the structural behaviour, ultimate strength and design of fixedended cold-formed steel (CFS) lipped channel columns experiencing various levels of localdistortional-global buckling mode interaction (more or less close critical local, distortional and global loads). First, a comparison between experimental results, obtained from two tests carried out at The University of Hong Kong (UHK), and the corresponding shell numerical simulations are presented and discussed - the UHK test campaign is reported in Part I of this two-part paper. The comparison (i) involves equilibrium paths, deformed configurations, failure loads and collapse mechanisms, and (ii) provides enough evidence to ensure that the numerical model developed may be deemed validated. Then, this numerical model is employed to perform a parametric study, aimed at obtaining numerical failure load data concerning lipped channel columns experiencing different levels of localdistortional-global interaction - 68 fixed-ended columns, exhibiting the same geometries of the specimens tested at UHK and various yield stresses, thus covering a wider slenderness range. Finally, this Part II paper uses the experimental failure loads reported in Part I and the numerical failure load data obtained in this work and collected from the literature to assess the quality of the ultimate strength estimates provided by various design approaches, based on the direct strength method (DSM), for cold-formed steel columns affected by the triple coupling phenomenon under consideration.
KW - Cold-formed steel columns
KW - Direct strength method
KW - Failure load data
KW - Lipped channels
KW - Local-distortional-global interaction
KW - Numerical simulations
UR - http://www.scopus.com/inward/record.url?scp=85013466907&partnerID=8YFLogxK
M3 - Conference article published in proceeding or book
VL - 108
T3 - Civil-Comp Proceedings
BT - Proceedings of the 15th International Conference on Civil, Structural and Environmental Engineering Computing, Prague, Czech Republic
T2 - 15th International Conference on Civil, Structural and Environmental Engineering Computing, CIVIL-COMP 2015
Y2 - 1 September 2015 through 4 September 2015
ER -