TY - JOUR
T1 - Design of cold-formed steel built-up open section members under combined compression and bending
AU - Li, Qiu Yun
AU - Young, Ben
N1 - Funding Information:
The first author is grateful for the support given by the Research Grants Council of Hong Kong for the Hong Kong PhD Fellowship Scheme.
Publisher Copyright:
© 2022 Elsevier Ltd
PY - 2022/3
Y1 - 2022/3
N2 - The numerical investigation on cold-formed steel built-up open section members under combined compression and minor axis bending is described in this paper. Through validating against experimental results in the literature, a rational finite element model of built-up section beam–column members was developed. The verified numerical model was employed for a comprehensive parametric study to obtain the results of 280 eccentrically loaded built-up section members. Furthermore, the applicability of the design formulae provided in the AISI Specification, AISC Specification, AS/NZS Standard and European Code was examined by comparing nominal strengths with loading capacities of the 280 numerical data produced in this study and 33 existing test data. Overall, the strength predictions determined by the codified interaction formulae based on the nominal compressive and flexural resistances calculated by the current direct strength method (DSM) were found to be highly scattered and underestimated by average of 17% – 27% for the built-up open section components experiencing combined loading. Hence, the modified DSM was recommended to determine the nominal resistances of the members under isolated compression or bending for more accurate endpoints of the load–moment interaction curve. In addition, a bi-linear interaction expression was proposed in this study for the design of the cold-formed steel built-up section beam–columns, which offered better strength predictions in accuracy and consistency compared to the codified interaction formulae.
AB - The numerical investigation on cold-formed steel built-up open section members under combined compression and minor axis bending is described in this paper. Through validating against experimental results in the literature, a rational finite element model of built-up section beam–column members was developed. The verified numerical model was employed for a comprehensive parametric study to obtain the results of 280 eccentrically loaded built-up section members. Furthermore, the applicability of the design formulae provided in the AISI Specification, AISC Specification, AS/NZS Standard and European Code was examined by comparing nominal strengths with loading capacities of the 280 numerical data produced in this study and 33 existing test data. Overall, the strength predictions determined by the codified interaction formulae based on the nominal compressive and flexural resistances calculated by the current direct strength method (DSM) were found to be highly scattered and underestimated by average of 17% – 27% for the built-up open section components experiencing combined loading. Hence, the modified DSM was recommended to determine the nominal resistances of the members under isolated compression or bending for more accurate endpoints of the load–moment interaction curve. In addition, a bi-linear interaction expression was proposed in this study for the design of the cold-formed steel built-up section beam–columns, which offered better strength predictions in accuracy and consistency compared to the codified interaction formulae.
KW - Cold-formed steel
KW - Combined loading
KW - Finite element model
KW - Load–moment interaction curve
KW - Parametric study
UR - http://www.scopus.com/inward/record.url?scp=85124027782&partnerID=8YFLogxK
U2 - 10.1016/j.tws.2022.108890
DO - 10.1016/j.tws.2022.108890
M3 - Journal article
AN - SCOPUS:85124027782
SN - 0263-8231
VL - 172
JO - Thin-Walled Structures
JF - Thin-Walled Structures
M1 - 108890
ER -