TY - JOUR
T1 - Global instability of cold-formed steel elliptical hollow section members under combined compression and biaxial bending
AU - Yao, Ye
AU - Quach, Wai Meng
AU - Young, Ben
N1 - Funding Information:
The authors would like to thank The Science and Technology Development Fund (FDCT), Macao SAR (File no. 0088/2022/A, and File no. 129/2014/A3), the University of Macau (MYRG2018-00099-FST), and the Fundamental Research Funds for the Central Universities (No. N2301016) for their financial support.
Publisher Copyright:
© 2023 Elsevier Ltd
PY - 2023/9/15
Y1 - 2023/9/15
N2 - The present study numerically investigated the global instability of cold-formed (CF) steel elliptical hollow section (EHS) members under combined compression and biaxial bending. A finite element (FE) model for CF tubular members under combined compression and biaxial bending was first developed, in which the strength enhancement, geometric imperfection and residual stresses due to roll-forming were incorporated. The FE model was validated against the existing test results. The validated FE model was employed to carry out a parametric study for CF steel EHS members, which covers an extensive range of cross-section geometries, material grades (including both high strength and normal grade steels), member slenderness, loading eccentricities and loading angles. Based on the generated FE data, the application of the current interaction design formulae for steel members under combined loading in EN 1993–1-1, together with the codified slenderness limits for circular hollow section (CHS) under combined loading, were assessed for the design of CF steel EHS members under combined compression and biaxial bending. It can be found that the design formulae in EN 1993–1-1, together with the slenderness limits for CHS, can give very conservative predictions for CF steel EHS members under combined loading. In addition, the influences of different parameters, including the loading eccentricity, loading angle, loading level and the reduction factor for lateral-torsional buckling, on the member behavior were also examined. Finally, new design recommendations are proposed for the design of CF steel EHS members under combined compression and biaxial bending.
AB - The present study numerically investigated the global instability of cold-formed (CF) steel elliptical hollow section (EHS) members under combined compression and biaxial bending. A finite element (FE) model for CF tubular members under combined compression and biaxial bending was first developed, in which the strength enhancement, geometric imperfection and residual stresses due to roll-forming were incorporated. The FE model was validated against the existing test results. The validated FE model was employed to carry out a parametric study for CF steel EHS members, which covers an extensive range of cross-section geometries, material grades (including both high strength and normal grade steels), member slenderness, loading eccentricities and loading angles. Based on the generated FE data, the application of the current interaction design formulae for steel members under combined loading in EN 1993–1-1, together with the codified slenderness limits for circular hollow section (CHS) under combined loading, were assessed for the design of CF steel EHS members under combined compression and biaxial bending. It can be found that the design formulae in EN 1993–1-1, together with the slenderness limits for CHS, can give very conservative predictions for CF steel EHS members under combined loading. In addition, the influences of different parameters, including the loading eccentricity, loading angle, loading level and the reduction factor for lateral-torsional buckling, on the member behavior were also examined. Finally, new design recommendations are proposed for the design of CF steel EHS members under combined compression and biaxial bending.
KW - Beam-columns
KW - Cold-forming
KW - Combined compression and biaxial bending
KW - Elliptical hollow section
KW - Global instability
KW - Numerical modeling
UR - http://www.scopus.com/inward/record.url?scp=85162137275&partnerID=8YFLogxK
U2 - 10.1016/j.engstruct.2023.116415
DO - 10.1016/j.engstruct.2023.116415
M3 - Journal article
AN - SCOPUS:85162137275
SN - 0141-0296
VL - 291
JO - Engineering Structures
JF - Engineering Structures
M1 - 116415
ER -