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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.
2019 (English)Doctoral thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Luleå University of Technology, 2019.
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, id: diva2:1129303
Public defence
2019-11-13, F1031, Luleå University of Technology, 10:00 (English)
Supervisors
Available from: 2017-08-11 Created: 2017-08-02 Last updated: 2019-09-27Bibliographically 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, p. 245-257Article 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)000374603200022 ()2-s2.0-84961589286 (Scopus ID)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: 2018-07-10Bibliographically 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, p. 227-238Article 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 ()2-s2.0-84976871845 (Scopus ID)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: 2018-07-10Bibliographically 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
Show others...
2019 (English)In: Advanced steel construction, ISSN 1816-112X, Vol. 15, no 3, p. 242-251Article in journal (Refereed) Published
Abstract [en]

This paper describes a study of the behaviour of cold-formed high strength steel angles. Thirty-six specimens with different cold-formed angles (90°, 100°, 120°, 140°, 160°, and 170°) and different thicknesses (4 mm and 6 mm) were considered. The initial geometric imperfections of the specimens were determined using the 3D laser scanning method. The magnitudes of these geometric imperfections for torsional and torsional-flexural buckling and flexural buckling analyses were proposed. The commercial finite element analysis (FEA) programme ABAQUS with shell elements S4R was used for finite element analyses. Different material strengths in corner and flat parts along with different proof stresses (0.2%, 0.01%, and 0.006%) were considered in the numerical models. The experimental and FEA results showed good agreement. Influence of cold-formed angle on non-dimensional slenderness and reduction factor curves of the 4 mm thick columns with 90° and 120° cold-formed angles was analysed.

Place, publisher, year, edition, pages
The Hong Kong Institute of Steel Construction, 2019
Keywords
High strength steel, Cold-formed angles, Geometrical imperfections, Proof stress, Experimental investigation, Finite element analysis
National Category
Civil Engineering Building Technologies Other Civil Engineering
Research subject
Structural Engineering
Identifiers
urn:nbn:se:ltu:diva-63086 (URN)10.18057/IJASC.2019.15.3.4 (DOI)000484782000004 ()
Note

Validerad;2019;Nivå 2;2019-09-27 (johcin)

Available from: 2017-04-19 Created: 2017-04-19 Last updated: 2019-09-27Bibliographically approved
4. Influence of cold-formed angle on high strength steel material properties
Open this publication in new window or tab >>Influence of cold-formed angle on high strength steel material properties
Show others...
2018 (English)In: Advanced steel construction, ISSN 1816-112XArticle in journal (Refereed) Submitted
Keywords
High strength steel, Cold-formed angle, Tensile coupon test, Ductility, Experimental investigation, 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: 2019-09-13

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