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Resistance of cold-formed high strength steel sections: Effect of cold-formed angle
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
2017 (English)Doctoral thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Luleå University of Technology, 2017.
Series
Doctoral thesis / Luleå University of Technology 1 jan 1997 → …, ISSN 1402-1544
National Category
Civil Engineering
Research subject
Steel Structures
Identifiers
URN: urn:nbn:se:ltu:diva-64936ISBN: 978-91-7583-931-8 (print)ISBN: 978-91-7583-932-5 (electronic)OAI: oai:DiVA.org:ltu-64936DiVA: diva2:1129303
Public defence
2017-10-06, F1031, Luleå University of Technology, 10:00 (English)
Supervisors
Available from: 2017-08-11 Created: 2017-08-02 Last updated: 2017-08-11Bibliographically approved
List of papers
1. Resistance of cold-formed high strength steel circular and polygonal sections: Part 1: Experimental investigations
Open this publication in new window or tab >>Resistance of cold-formed high strength steel circular and polygonal sections: Part 1: Experimental investigations
2016 (English)In: Journal of constructional steel research, ISSN 0143-974X, E-ISSN 1873-5983, Vol. 120, 245-257 p.Article in journal (Refereed) Published
Abstract [en]

This paper presents results from experiments performed on cold-formed high strength steel circular and polygonal sections. The test specimens were conceived to provide necessary information for development of tubular towers for wind turbines. A total of 32 high strength steel specimens were tested under uniaxial compression. Various thicknesses, openings and geometric imperfections were studied. Sixteen specimens without opening and sixteen specimens with opening were tested under axial compression in order to investigate influences of opening on the resistances. Tensile tests of coupon specimens taken from flat part, circular part and corner part were used to investigate basic properties of high strength steel material S650 and to evaluate influence of corner on the material strength and ductility. Initial geometric imperfections of the specimens were determined by using a 3D laser scanning method. The coupon test results were used to calibrate the ductile damage material models for modelling of fracture. Results from the experiments are fully described in this paper

National Category
Building Technologies
Research subject
Steel Structures
Identifiers
urn:nbn:se:ltu:diva-6940 (URN)10.1016/j.jcsr.2015.10.014 (DOI)54549d2a-844f-412f-8a47-886dfba0bd03 (Local ID)54549d2a-844f-412f-8a47-886dfba0bd03 (Archive number)54549d2a-844f-412f-8a47-886dfba0bd03 (OAI)
Note
Validerad; 2016; Nivå 2; 20151027 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-08-02Bibliographically approved
2. Resistance of cold-formed high strength steel circular and polygonal sections: Part 2: Numerical investigations
Open this publication in new window or tab >>Resistance of cold-formed high strength steel circular and polygonal sections: Part 2: Numerical investigations
2016 (English)In: Journal of constructional steel research, ISSN 0143-974X, E-ISSN 1873-5983, Vol. 125, 227-238 p.Article in journal (Refereed) Published
Abstract [en]

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.

National Category
Building Technologies
Research subject
Steel Structures
Identifiers
urn:nbn:se:ltu:diva-7640 (URN)10.1016/j.jcsr.2016.06.014 (DOI)000381834200017 ()60a8f640-4371-4b15-a819-88e3073103a4 (Local ID)60a8f640-4371-4b15-a819-88e3073103a4 (Archive number)60a8f640-4371-4b15-a819-88e3073103a4 (OAI)
Note

Validerad; 2016; Nivå 2; 20160705 (andbra)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-08-02Bibliographically approved
3. Resistance of cold-formed high strength steel angles
Open this publication in new window or tab >>Resistance of cold-formed high strength steel angles
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2017 (English)In: Engineering structures, ISSN 0141-0296, E-ISSN 1873-7323Article in journal (Refereed) Submitted
Keyword
High strength steel, Cold-formed sections, Geometrical imperfections, Experimental investigation, Finite element analysis, Buckling curve.
National Category
Civil Engineering Building Technologies
Research subject
Steel Structures
Identifiers
urn:nbn:se:ltu:diva-63086 (URN)
Available from: 2017-04-19 Created: 2017-04-19 Last updated: 2017-08-02
4. Influence of cold forming angle on the material properties of high strength steel
Open this publication in new window or tab >>Influence of cold forming angle on the material properties of high strength steel
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2017 (English)In: Journal of constructional steel research, ISSN 0143-974X, E-ISSN 1873-5983Article in journal (Refereed) Submitted
Keyword
High strength steel, Cold forming angle, Tensile coupon test, Ductility, Finite element analysis
National Category
Building Technologies
Research subject
Steel Structures
Identifiers
urn:nbn:se:ltu:diva-62267 (URN)
Available from: 2017-03-02 Created: 2017-03-02 Last updated: 2017-08-02

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