TY - JOUR
T1 - Effect of web hole spacing on axial capacity of back-to-back cold-formed steel channels with edge-stiffened holes
AU - Chi, Yaohui
AU - Roy, Krishanu
AU - Chen, Boshan
AU - Fang, Zhiyuan
AU - Uzzaman, Asraf
AU - Ananthi, G. Beulah Gnana
AU - Lim, James B.P.
PY - 2021/7/25
Y1 - 2021/7/25
N2 - Recently, a new generation of cold-formed steel (CFS) channel section with edge-stiffened web holes has been developed by industry in New Zealand. However, no research has been reported in the literature to investigate the axial capacity of back-to-back channels with edge-stiffened web holes. This paper presents a total of 73 new results comprising 29 compression tests and 44 finite element analyses (FEA) on axial capacity of such back-to-back CFS channels. The results show that for back-to-back channels with seven edge-stiffened holes, the axial capacity increased by 19.2%, compared to plain channels without web holes. A non-linear finite element (FE) model was developed and validated against the test results. The validated FE model was used to conduct a parametric study involving 44 FE models. Finely, the tests results were compared with the design strengths calculated from the AISI and AS/NZ standards and from the proposed design equations of Moen and Schafer. From the comparison results, it was found that the AISI and AS/NZ design strengths are only 9% conservative to the test results for plain channels without web holes. While Moen and Schafer equations are conservative by 13% and 47% for axial capacity of CFS back-to-back channels with un-stiffened and edge-stiffened web holes, respectively.
AB - Recently, a new generation of cold-formed steel (CFS) channel section with edge-stiffened web holes has been developed by industry in New Zealand. However, no research has been reported in the literature to investigate the axial capacity of back-to-back channels with edge-stiffened web holes. This paper presents a total of 73 new results comprising 29 compression tests and 44 finite element analyses (FEA) on axial capacity of such back-to-back CFS channels. The results show that for back-to-back channels with seven edge-stiffened holes, the axial capacity increased by 19.2%, compared to plain channels without web holes. A non-linear finite element (FE) model was developed and validated against the test results. The validated FE model was used to conduct a parametric study involving 44 FE models. Finely, the tests results were compared with the design strengths calculated from the AISI and AS/NZ standards and from the proposed design equations of Moen and Schafer. From the comparison results, it was found that the AISI and AS/NZ design strengths are only 9% conservative to the test results for plain channels without web holes. While Moen and Schafer equations are conservative by 13% and 47% for axial capacity of CFS back-to-back channels with un-stiffened and edge-stiffened web holes, respectively.
KW - back-to-back channels
KW - cold-formed steel
KW - compression tests
KW - edge-stiffened holes
KW - finite element modelling
UR - http://www.scopus.com/inward/record.url?scp=85110769338&partnerID=8YFLogxK
U2 - 10.12989/scs.2021.40.2.287
DO - 10.12989/scs.2021.40.2.287
M3 - Article
AN - SCOPUS:85110769338
SN - 1229-9367
VL - 40
SP - 287
EP - 305
JO - Steel and Composite Structures
JF - Steel and Composite Structures
IS - 2
ER -