TY - JOUR
T1 - Experimental and numerical studies on cold-formed steel battened columns
AU - Li, Qiu Yun
AU - Young, Ben
N1 - Funding Information:
The authors are grateful to BlueScope Lysaght (Singapore) Pte. Ltd. for supplying the test specimens.
Publisher Copyright:
© 2023 Elsevier Ltd
PY - 2023/8/1
Y1 - 2023/8/1
N2 - The compression performance of cold-formed steel battened columns was experimentally and numerically investigated in this study. Three types of built-up sections considered in this study were composed of two stiffened chord components and longitudinally distributed batten plates, which were assembled utilizing self-tapping screws. A total of 20 simply supported columns were tested under concentric compression. The experimental results in terms of loading capacity, failure mode and load versus shortening response were obtained and then employed to calibrate the finite element model. Furthermore, based on the verified finite element model, a parametric study was carried out to explore the effects of member slenderness, transverse distance between the chords and longitudinal batten spacing on the compressive strengths of the thin-walled battened columns. Underpinned by the results of 20 experiments and 216 numerical analyses, it was demonstrated that the nominal strengths by doubling the resistances of individual chord components determined using direct strength method were generally rather conservative and quite scattered for the cold-formed steel battened members undergoing compression. Additionally, the provisions specified in the AISI S100 with the shear stiffness reduction of built-up section members considered by the modified slenderness ratio were overall unconservative to predict the compressive strengths of the thin-walled battened columns. Therefore, modifications of the current design rules were proposed in this investigation to offer accurate strength predictions for the cold-formed steel battened compression members.
AB - The compression performance of cold-formed steel battened columns was experimentally and numerically investigated in this study. Three types of built-up sections considered in this study were composed of two stiffened chord components and longitudinally distributed batten plates, which were assembled utilizing self-tapping screws. A total of 20 simply supported columns were tested under concentric compression. The experimental results in terms of loading capacity, failure mode and load versus shortening response were obtained and then employed to calibrate the finite element model. Furthermore, based on the verified finite element model, a parametric study was carried out to explore the effects of member slenderness, transverse distance between the chords and longitudinal batten spacing on the compressive strengths of the thin-walled battened columns. Underpinned by the results of 20 experiments and 216 numerical analyses, it was demonstrated that the nominal strengths by doubling the resistances of individual chord components determined using direct strength method were generally rather conservative and quite scattered for the cold-formed steel battened members undergoing compression. Additionally, the provisions specified in the AISI S100 with the shear stiffness reduction of built-up section members considered by the modified slenderness ratio were overall unconservative to predict the compressive strengths of the thin-walled battened columns. Therefore, modifications of the current design rules were proposed in this investigation to offer accurate strength predictions for the cold-formed steel battened compression members.
KW - Battened columns
KW - Cold-formed steel
KW - Compression tests
KW - Direct strength method
KW - Numerical simulation
KW - Strength predictions
UR - http://www.scopus.com/inward/record.url?scp=85156087851&partnerID=8YFLogxK
U2 - 10.1016/j.engstruct.2023.116110
DO - 10.1016/j.engstruct.2023.116110
M3 - Journal article
AN - SCOPUS:85156087851
SN - 0141-0296
VL - 288
JO - Engineering Structures
JF - Engineering Structures
M1 - 116110
ER -