Design of cold-formed HSS channels for bending and eccentric compression: Bending about the axis of symmetry

Pekka Salmi, Asko Talja

Research output: Book/ReportReport

Abstract

Open channel sections manufactured from high-strength steel (HSS) were tested. The sections were bent about the axis of symmetry of the cross sections. The roll formed test profiles, one U, two C and one hat cross section with yield stresses of 565 - 655 N/mm2 and material thicknesses of 4 6 mm were taken from normal production. Also one point symmetric Z profile of lower grade steel was included in the test series. Tests were made for bending and eccentric compression. Bending tests for short and long beams (12 tests) were made to determine the cross sectional properties and lateral buckling resistance of the beams respectively. The eccentric compression tests (12 tests) studied the interaction between compression and bending resistance. The test results together with other test results from literature are compared with the design resistance determined according to the proposed design method. The simplified method is a combination of the Eurocode 3/Annex A and AISI 1989 codes. The elastic buckling stresses are calculated using the full, unreduced dimensions, while actual section strength is determined with the effective dimensions. The method is satisfactory for normal design, although in some cases it is found to be too conservative. Comparison with the other test results confirmed that the accuracy of the design rules do not depend on the yield strength or wall thickness. Some non linear FEM analyses indicated the feasibility also in this loading case.
Original languageEnglish
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Number of pages82
ISBN (Print)951-38-4440-4
Publication statusPublished - 1993
MoE publication typeNot Eligible

Publication series

SeriesVTT Tiedotteita - Meddelanden - Research Notes
Number1505
ISSN1235-0605

Fingerprint

High strength steel
Buckling
Yield stress
Bending tests
Finite element method
Steel

Keywords

  • steel structures
  • steel construction
  • high strength steels
  • structural steels
  • design
  • cold working
  • dimensioning
  • bending properties
  • bending stress
  • tests
  • eccentricity
  • compression tests
  • cross sections
  • buckling
  • beams (supports)
  • comparison

Cite this

Salmi, P., & Talja, A. (1993). Design of cold-formed HSS channels for bending and eccentric compression: Bending about the axis of symmetry. Espoo: VTT Technical Research Centre of Finland. VTT Tiedotteita - Meddelanden - Research Notes, No. 1505
Salmi, Pekka ; Talja, Asko. / Design of cold-formed HSS channels for bending and eccentric compression : Bending about the axis of symmetry. Espoo : VTT Technical Research Centre of Finland, 1993. 82 p. (VTT Tiedotteita - Meddelanden - Research Notes; No. 1505).
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abstract = "Open channel sections manufactured from high-strength steel (HSS) were tested. The sections were bent about the axis of symmetry of the cross sections. The roll formed test profiles, one U, two C and one hat cross section with yield stresses of 565 - 655 N/mm2 and material thicknesses of 4 6 mm were taken from normal production. Also one point symmetric Z profile of lower grade steel was included in the test series. Tests were made for bending and eccentric compression. Bending tests for short and long beams (12 tests) were made to determine the cross sectional properties and lateral buckling resistance of the beams respectively. The eccentric compression tests (12 tests) studied the interaction between compression and bending resistance. The test results together with other test results from literature are compared with the design resistance determined according to the proposed design method. The simplified method is a combination of the Eurocode 3/Annex A and AISI 1989 codes. The elastic buckling stresses are calculated using the full, unreduced dimensions, while actual section strength is determined with the effective dimensions. The method is satisfactory for normal design, although in some cases it is found to be too conservative. Comparison with the other test results confirmed that the accuracy of the design rules do not depend on the yield strength or wall thickness. Some non linear FEM analyses indicated the feasibility also in this loading case.",
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Salmi, P & Talja, A 1993, Design of cold-formed HSS channels for bending and eccentric compression: Bending about the axis of symmetry. VTT Tiedotteita - Meddelanden - Research Notes, no. 1505, VTT Technical Research Centre of Finland, Espoo.

Design of cold-formed HSS channels for bending and eccentric compression : Bending about the axis of symmetry. / Salmi, Pekka; Talja, Asko.

Espoo : VTT Technical Research Centre of Finland, 1993. 82 p. (VTT Tiedotteita - Meddelanden - Research Notes; No. 1505).

Research output: Book/ReportReport

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N2 - Open channel sections manufactured from high-strength steel (HSS) were tested. The sections were bent about the axis of symmetry of the cross sections. The roll formed test profiles, one U, two C and one hat cross section with yield stresses of 565 - 655 N/mm2 and material thicknesses of 4 6 mm were taken from normal production. Also one point symmetric Z profile of lower grade steel was included in the test series. Tests were made for bending and eccentric compression. Bending tests for short and long beams (12 tests) were made to determine the cross sectional properties and lateral buckling resistance of the beams respectively. The eccentric compression tests (12 tests) studied the interaction between compression and bending resistance. The test results together with other test results from literature are compared with the design resistance determined according to the proposed design method. The simplified method is a combination of the Eurocode 3/Annex A and AISI 1989 codes. The elastic buckling stresses are calculated using the full, unreduced dimensions, while actual section strength is determined with the effective dimensions. The method is satisfactory for normal design, although in some cases it is found to be too conservative. Comparison with the other test results confirmed that the accuracy of the design rules do not depend on the yield strength or wall thickness. Some non linear FEM analyses indicated the feasibility also in this loading case.

AB - Open channel sections manufactured from high-strength steel (HSS) were tested. The sections were bent about the axis of symmetry of the cross sections. The roll formed test profiles, one U, two C and one hat cross section with yield stresses of 565 - 655 N/mm2 and material thicknesses of 4 6 mm were taken from normal production. Also one point symmetric Z profile of lower grade steel was included in the test series. Tests were made for bending and eccentric compression. Bending tests for short and long beams (12 tests) were made to determine the cross sectional properties and lateral buckling resistance of the beams respectively. The eccentric compression tests (12 tests) studied the interaction between compression and bending resistance. The test results together with other test results from literature are compared with the design resistance determined according to the proposed design method. The simplified method is a combination of the Eurocode 3/Annex A and AISI 1989 codes. The elastic buckling stresses are calculated using the full, unreduced dimensions, while actual section strength is determined with the effective dimensions. The method is satisfactory for normal design, although in some cases it is found to be too conservative. Comparison with the other test results confirmed that the accuracy of the design rules do not depend on the yield strength or wall thickness. Some non linear FEM analyses indicated the feasibility also in this loading case.

KW - steel structures

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KW - cold working

KW - dimensioning

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KW - tests

KW - eccentricity

KW - compression tests

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KW - buckling

KW - beams (supports)

KW - comparison

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Salmi P, Talja A. Design of cold-formed HSS channels for bending and eccentric compression: Bending about the axis of symmetry. Espoo: VTT Technical Research Centre of Finland, 1993. 82 p. (VTT Tiedotteita - Meddelanden - Research Notes; No. 1505).