Session Start Date

11-5-2014

Session End Date

11-5-2014

Abstract

Presented in this paper is an experimental investigation on the effect of web holes on the strength of cold-formed steel (CFS) C-shape columns. A total of 18 CFS C-shape stub columns were tested without and with web holes. The column length and web height of C-shape section were 490 mm (19 in) and 150 mm (6 in), respectively; and the lengths of the holes investigated were 74 mm (3 in), 114 mm (4.5 in) and 130 mm (5 in) whereas the width of the holes remains as 38 mm (1.5 in). It is noted that for the strength determination of uniformly compressed stiffened elements with non-circular holes AISI-S100 requires the length of the holes not to exceed 114 mm (4.5 in). The test results obtained from this investigation showed that local buckling at the column ends combining with one distortional half-wave along the column length was the predominant failure mode. Results also indicate that the presence of web holes had negligible effect on the ultimate compressive strengths for the hole dimensions considered here. A numerical investigation based on elastic buckling analysis confirmed that the elastic local buckling load is not affected by the presence of the hole while the elastic distortional buckling load decreases slightly as the increase of the length of the hole. A comparison between results of the tests and the Direct Strength Method approach (DSM) for CFS columns with holes demonstrated that the DSM design equations are valid to evaluate the strength of CFS C-shape columns with web holes.

Department(s)

Civil, Architectural and Environmental Engineering

Research Center/Lab(s)

Wei-Wen Yu Center for Cold-Formed Steel Structures

Meeting Name

22nd International Specialty Conference on Cold-Formed Steel Structures

Publisher

Missouri University of Science and Technology

Publication Date

11-5-2014

Document Version

Final Version

Rights

© 2014 Missouri University of Science and Technology, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Compressive Strength of Cold-Formed Steel C-shape Columns with Slotted Holes

Presented in this paper is an experimental investigation on the effect of web holes on the strength of cold-formed steel (CFS) C-shape columns. A total of 18 CFS C-shape stub columns were tested without and with web holes. The column length and web height of C-shape section were 490 mm (19 in) and 150 mm (6 in), respectively; and the lengths of the holes investigated were 74 mm (3 in), 114 mm (4.5 in) and 130 mm (5 in) whereas the width of the holes remains as 38 mm (1.5 in). It is noted that for the strength determination of uniformly compressed stiffened elements with non-circular holes AISI-S100 requires the length of the holes not to exceed 114 mm (4.5 in). The test results obtained from this investigation showed that local buckling at the column ends combining with one distortional half-wave along the column length was the predominant failure mode. Results also indicate that the presence of web holes had negligible effect on the ultimate compressive strengths for the hole dimensions considered here. A numerical investigation based on elastic buckling analysis confirmed that the elastic local buckling load is not affected by the presence of the hole while the elastic distortional buckling load decreases slightly as the increase of the length of the hole. A comparison between results of the tests and the Direct Strength Method approach (DSM) for CFS columns with holes demonstrated that the DSM design equations are valid to evaluate the strength of CFS C-shape columns with web holes.