Simplified design expressions for cold-formed channel sections

Asko Talja, Pekka Salmi

Research output: Book/ReportReport

Abstract

This study is a summary of the investigations into the design of cold-formed steel sections manufactured from high-strength steels (HSS), made by the Technical Research Centre of Finland (VTT) during the years 1989 - 1993. The main purpose of the project has been to obtain test data and develop and simplify the design rules for HSS members. The first part of the publication gives examples of the different stability phenomena of channel sections. In addition to the stability of members, such as flexural, torsional-flexural and lateral buckling, also the local buckling of unstiffened and edge-stiffened plates is considered. The second part presents the simplified design expressions. The main principles are in accordance with Eurocode 3 Part 1.3, but many conservative simplifications are given. The third part compares the predicted resistances with the experimental values. The test programme covers concentric compression tests, bending tests, eccentric compression tests and support reaction tests. The total number of full-scale tests made by VTT is 89. The cold-rolled test sections are U, C and hat profiles with different lengths. The material and cross-section properties varied in yield stress from 400 to 670 N/mm2, material thickness of 4 - 7 mm and web height of 110 - 280 mm. In addition to VTT's results, in all 178 other tests are analyzed. These results concern usual thin-walled carbon steel sections. When all the test results are treated as a family of tests, statistical analyses show that the expressions give satisfactory accuracy for normal design, but in some cases the results are very conservative and more accurate methods are desired. The comparisons confirm that the yield strength or wall thickness has no significant effect on accuracy.
Original languageEnglish
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Number of pages68
ISBN (Print)951-38-4639-3
Publication statusPublished - 1994
MoE publication typeNot Eligible

Publication series

SeriesVTT Publications
Number201
ISSN1235-0621

Fingerprint

High strength steel
Buckling
Yield stress
Statistical tests
Bending tests
Carbon steel
Steel

Keywords

  • steel construction
  • structural steels
  • structural members
  • high strength steels
  • design
  • cold working
  • structural analysis
  • columns (supports)
  • beams (supports)
  • steel structures
  • carbon steels
  • buckling
  • stability
  • metal plates
  • comparison
  • compression tests
  • mechanical properties
  • materials tests
  • Eurocode 3

Cite this

Talja, A., & Salmi, P. (1994). Simplified design expressions for cold-formed channel sections. Espoo: VTT Technical Research Centre of Finland. VTT Publications, No. 201
Talja, Asko ; Salmi, Pekka. / Simplified design expressions for cold-formed channel sections. Espoo : VTT Technical Research Centre of Finland, 1994. 68 p. (VTT Publications; No. 201).
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Talja, A & Salmi, P 1994, Simplified design expressions for cold-formed channel sections. VTT Publications, no. 201, VTT Technical Research Centre of Finland, Espoo.

Simplified design expressions for cold-formed channel sections. / Talja, Asko; Salmi, Pekka.

Espoo : VTT Technical Research Centre of Finland, 1994. 68 p. (VTT Publications; No. 201).

Research output: Book/ReportReport

TY - BOOK

T1 - Simplified design expressions for cold-formed channel sections

AU - Talja, Asko

AU - Salmi, Pekka

N1 - Project code: RTE3793

PY - 1994

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N2 - This study is a summary of the investigations into the design of cold-formed steel sections manufactured from high-strength steels (HSS), made by the Technical Research Centre of Finland (VTT) during the years 1989 - 1993. The main purpose of the project has been to obtain test data and develop and simplify the design rules for HSS members. The first part of the publication gives examples of the different stability phenomena of channel sections. In addition to the stability of members, such as flexural, torsional-flexural and lateral buckling, also the local buckling of unstiffened and edge-stiffened plates is considered. The second part presents the simplified design expressions. The main principles are in accordance with Eurocode 3 Part 1.3, but many conservative simplifications are given. The third part compares the predicted resistances with the experimental values. The test programme covers concentric compression tests, bending tests, eccentric compression tests and support reaction tests. The total number of full-scale tests made by VTT is 89. The cold-rolled test sections are U, C and hat profiles with different lengths. The material and cross-section properties varied in yield stress from 400 to 670 N/mm2, material thickness of 4 - 7 mm and web height of 110 - 280 mm. In addition to VTT's results, in all 178 other tests are analyzed. These results concern usual thin-walled carbon steel sections. When all the test results are treated as a family of tests, statistical analyses show that the expressions give satisfactory accuracy for normal design, but in some cases the results are very conservative and more accurate methods are desired. The comparisons confirm that the yield strength or wall thickness has no significant effect on accuracy.

AB - This study is a summary of the investigations into the design of cold-formed steel sections manufactured from high-strength steels (HSS), made by the Technical Research Centre of Finland (VTT) during the years 1989 - 1993. The main purpose of the project has been to obtain test data and develop and simplify the design rules for HSS members. The first part of the publication gives examples of the different stability phenomena of channel sections. In addition to the stability of members, such as flexural, torsional-flexural and lateral buckling, also the local buckling of unstiffened and edge-stiffened plates is considered. The second part presents the simplified design expressions. The main principles are in accordance with Eurocode 3 Part 1.3, but many conservative simplifications are given. The third part compares the predicted resistances with the experimental values. The test programme covers concentric compression tests, bending tests, eccentric compression tests and support reaction tests. The total number of full-scale tests made by VTT is 89. The cold-rolled test sections are U, C and hat profiles with different lengths. The material and cross-section properties varied in yield stress from 400 to 670 N/mm2, material thickness of 4 - 7 mm and web height of 110 - 280 mm. In addition to VTT's results, in all 178 other tests are analyzed. These results concern usual thin-walled carbon steel sections. When all the test results are treated as a family of tests, statistical analyses show that the expressions give satisfactory accuracy for normal design, but in some cases the results are very conservative and more accurate methods are desired. The comparisons confirm that the yield strength or wall thickness has no significant effect on accuracy.

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KW - structural steels

KW - structural members

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KW - design

KW - cold working

KW - structural analysis

KW - columns (supports)

KW - beams (supports)

KW - steel structures

KW - carbon steels

KW - buckling

KW - stability

KW - metal plates

KW - comparison

KW - compression tests

KW - mechanical properties

KW - materials tests

KW - Eurocode 3

M3 - Report

SN - 951-38-4639-3

T3 - VTT Publications

BT - Simplified design expressions for cold-formed channel sections

PB - VTT Technical Research Centre of Finland

CY - Espoo

ER -

Talja A, Salmi P. Simplified design expressions for cold-formed channel sections. Espoo: VTT Technical Research Centre of Finland, 1994. 68 p. (VTT Publications; No. 201).