TY - JOUR
T1 - Cold-formed steel elliptical hollow section stub columns under combined compression and biaxial bending
AU - Yao, Ye
AU - Kong, Zhengyi
AU - Quach, Wai Meng
AU - Young, Ben
N1 - Funding Information:
The authors would like to thank The Science and Technology Development Fund, Macau S.A.R (FDCT) (File no. 0088/2022/A , File no. 129/2014/A3 , and File no. 073/2015/A2 ), the University of Macau (File no. MYRG2018-00099-FST , and File no. MYRG073(Y1-L2)-FST13-QWM ), and the Fundamental Research Funds for the Central Universities (No. N2101011 ) for their financial support.
Publisher Copyright:
© 2023 Elsevier Ltd
PY - 2023/3
Y1 - 2023/3
N2 - The paper presents a numerical study on the cross-section behavior of cold-formed (CF) steel elliptical hollow sections (EHS) under combined compression and biaxial bending. In the present study, a finite element (FE) model for CF steel tubular stub columns under combined compression and biaxial bending was first developed, in which the local geometric imperfections, residual stresses and enhanced material behavior were predicted by a rigorous numerical simulation of roll forming. The developed FE model for CF steel tubular stub columns under combined compression and biaxial bending was validated against test results of various tubular sections (including EHS). Then, the validated FE model was employed to carry out a parametric study for CF steel EHS with a large range of steel grades (including both high strength and normal grade steels), section sizes, loading eccentricities and angles. Based on the generated FE data, the traditional design specifications for doubly symmetric cross-sections under combined loading in EN 1993-1-1: 2005 (CEN, 2005) and ANSI/AISC 360-16 (AISC, 2016), as well as the current design equations for hot-finished (HF) normal grade steel EHS suggested by Gardner et al. (2011) under combined loading were evaluated for the design of CF steel EHS under combined loading. New slenderness limits of Class 2 and Class 3 sections, as well as new design equations of cross-section resistances, for CF steel EHS stub columns under combined compression and biaxial bending are proposed.
AB - The paper presents a numerical study on the cross-section behavior of cold-formed (CF) steel elliptical hollow sections (EHS) under combined compression and biaxial bending. In the present study, a finite element (FE) model for CF steel tubular stub columns under combined compression and biaxial bending was first developed, in which the local geometric imperfections, residual stresses and enhanced material behavior were predicted by a rigorous numerical simulation of roll forming. The developed FE model for CF steel tubular stub columns under combined compression and biaxial bending was validated against test results of various tubular sections (including EHS). Then, the validated FE model was employed to carry out a parametric study for CF steel EHS with a large range of steel grades (including both high strength and normal grade steels), section sizes, loading eccentricities and angles. Based on the generated FE data, the traditional design specifications for doubly symmetric cross-sections under combined loading in EN 1993-1-1: 2005 (CEN, 2005) and ANSI/AISC 360-16 (AISC, 2016), as well as the current design equations for hot-finished (HF) normal grade steel EHS suggested by Gardner et al. (2011) under combined loading were evaluated for the design of CF steel EHS under combined loading. New slenderness limits of Class 2 and Class 3 sections, as well as new design equations of cross-section resistances, for CF steel EHS stub columns under combined compression and biaxial bending are proposed.
KW - Cold forming
KW - Combined compression and biaxial bending
KW - Cross-section classification
KW - Cross-section resistance
KW - Elliptical hollow section
KW - Finite element
UR - http://www.scopus.com/inward/record.url?scp=85146590727&partnerID=8YFLogxK
U2 - 10.1016/j.tws.2023.110531
DO - 10.1016/j.tws.2023.110531
M3 - Journal article
AN - SCOPUS:85146590727
SN - 0263-8231
VL - 184
JO - Thin-Walled Structures
JF - Thin-Walled Structures
M1 - 110531
ER -