TY - JOUR
T1 - Resistance of cold-formed high strength steel circular and polygonal sections - Part 2
T2 - Numerical investigations
AU - Tran, Anh Tuan
AU - Veljkovic, Milan
AU - Rebelo, Carlos
AU - da Silva, Luís Simões
PY - 2016/10/1
Y1 - 2016/10/1
N2 - This paper is the second part of the study on the cold-formed high strength steel circular and polygonal sections intended to be used in tubular wind towers. Results from 32 numerical finite element analysis (FEA) models were compared with and calibrated against results of the tests on 32 corresponding specimens. The FEA results agreed well with the experimental results in terms of resistances and load-displacement curves. Further investigations on the numerical models were performed. Yield stress used in the FEA significantly affected the resistances of the numerical models. Using 0.2% proof stress leaded to higher resistance than the experimental results. Corners significantly influenced buckling behaviour in the polygonal section models. Analyses of an oval opening in the tubular specimens showed that peak stresses around the opening were considerably higher in the polygonal section models than in the circular section models. Finally, investigation of sensitivity to geometrical imperfections indicated that failure modes of numerical models with geometrical imperfections according to EC3 significantly differed from those of tested specimens and numerical models with geometrical imperfections obtained from the 3D scans.
AB - This paper is the second part of the study on the cold-formed high strength steel circular and polygonal sections intended to be used in tubular wind towers. Results from 32 numerical finite element analysis (FEA) models were compared with and calibrated against results of the tests on 32 corresponding specimens. The FEA results agreed well with the experimental results in terms of resistances and load-displacement curves. Further investigations on the numerical models were performed. Yield stress used in the FEA significantly affected the resistances of the numerical models. Using 0.2% proof stress leaded to higher resistance than the experimental results. Corners significantly influenced buckling behaviour in the polygonal section models. Analyses of an oval opening in the tubular specimens showed that peak stresses around the opening were considerably higher in the polygonal section models than in the circular section models. Finally, investigation of sensitivity to geometrical imperfections indicated that failure modes of numerical models with geometrical imperfections according to EC3 significantly differed from those of tested specimens and numerical models with geometrical imperfections obtained from the 3D scans.
KW - Cold-formed sections
KW - FEA
KW - Geometrical imperfections
KW - High strength steel
KW - Wind turbine towers
UR - http://www.scopus.com/inward/record.url?scp=84976871845&partnerID=8YFLogxK
U2 - 10.1016/j.jcsr.2016.06.014
DO - 10.1016/j.jcsr.2016.06.014
M3 - Article
AN - SCOPUS:84976871845
SN - 0143-974X
VL - 125
SP - 227
EP - 238
JO - Journal of Constructional Steel Research
JF - Journal of Constructional Steel Research
ER -