Stainless steel stub columns subject to combined bending and axial loading

Martin Macdonald, J. Rhodes

Research output: Contribution to conferencePaper

Abstract

Stainless steel exhibits highly non-linear behaviour, and in the case of short column structural members, this can lead to substantial conservatism in the prediction of load capacity by design codes due to their use of the 0.2% proof stress as an upper limit of capacity. This paper examines the behaviour of short stainless steel stub columns in which the material follows a Ramberg-Osgood type of stress-strain law. The column length is varied to examine the effects on the load capacity when the column is subjected to varying magnitudes of combined bending and axial compression loading. The loading is applied as eccentric axial loading, with the eccentricity being positive at one end and negative at the other to produce varying moments along the column under load. Two different methods of analysis are employed, (1) the ASCE design code using a Ramberg-Osgood stress-strain law combined with a full section moment capacity within the interaction formula with nominal levels of loading eccentricity, and (2), the same approach, but using the true eccentricity with reference to the unsupported length of the columns. The results are compared with those obtained from a series of compression tests performed on cold formed stainless steel Type 304 stub columns of lipped channel cross-section for the same conditions.

Conference

Conference17th International Speciality Conference on Cold Formed Steel Structures
CityOrlando, Florida
Period4/11/045/11/04

Fingerprint

Stainless steel
Structural members
Axial compression

Keywords

  • finite element analysis
  • dynamic loading
  • stainless steel

Cite this

Macdonald, M., & Rhodes, J. (2004). Stainless steel stub columns subject to combined bending and axial loading. Paper presented at 17th International Speciality Conference on Cold Formed Steel Structures, Orlando, Florida, .
Macdonald, Martin ; Rhodes, J. / Stainless steel stub columns subject to combined bending and axial loading. Paper presented at 17th International Speciality Conference on Cold Formed Steel Structures, Orlando, Florida, .
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title = "Stainless steel stub columns subject to combined bending and axial loading",
abstract = "Stainless steel exhibits highly non-linear behaviour, and in the case of short column structural members, this can lead to substantial conservatism in the prediction of load capacity by design codes due to their use of the 0.2{\%} proof stress as an upper limit of capacity. This paper examines the behaviour of short stainless steel stub columns in which the material follows a Ramberg-Osgood type of stress-strain law. The column length is varied to examine the effects on the load capacity when the column is subjected to varying magnitudes of combined bending and axial compression loading. The loading is applied as eccentric axial loading, with the eccentricity being positive at one end and negative at the other to produce varying moments along the column under load. Two different methods of analysis are employed, (1) the ASCE design code using a Ramberg-Osgood stress-strain law combined with a full section moment capacity within the interaction formula with nominal levels of loading eccentricity, and (2), the same approach, but using the true eccentricity with reference to the unsupported length of the columns. The results are compared with those obtained from a series of compression tests performed on cold formed stainless steel Type 304 stub columns of lipped channel cross-section for the same conditions.",
keywords = "finite element analysis, dynamic loading, stainless steel",
author = "Martin Macdonald and J. Rhodes",
note = "Also published in: Thin-Walled Structures (2007), 45 (10-11), 893-897. (This is a variant record); 17th International Speciality Conference on Cold Formed Steel Structures ; Conference date: 04-11-2004 Through 05-11-2004",
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Macdonald, M & Rhodes, J 2004, 'Stainless steel stub columns subject to combined bending and axial loading' Paper presented at 17th International Speciality Conference on Cold Formed Steel Structures, Orlando, Florida, 4/11/04 - 5/11/04, .

Stainless steel stub columns subject to combined bending and axial loading. / Macdonald, Martin; Rhodes, J.

2004. Paper presented at 17th International Speciality Conference on Cold Formed Steel Structures, Orlando, Florida, .

Research output: Contribution to conferencePaper

TY - CONF

T1 - Stainless steel stub columns subject to combined bending and axial loading

AU - Macdonald, Martin

AU - Rhodes, J.

N1 - Also published in: Thin-Walled Structures (2007), 45 (10-11), 893-897. (This is a variant record)

PY - 2004/11

Y1 - 2004/11

N2 - Stainless steel exhibits highly non-linear behaviour, and in the case of short column structural members, this can lead to substantial conservatism in the prediction of load capacity by design codes due to their use of the 0.2% proof stress as an upper limit of capacity. This paper examines the behaviour of short stainless steel stub columns in which the material follows a Ramberg-Osgood type of stress-strain law. The column length is varied to examine the effects on the load capacity when the column is subjected to varying magnitudes of combined bending and axial compression loading. The loading is applied as eccentric axial loading, with the eccentricity being positive at one end and negative at the other to produce varying moments along the column under load. Two different methods of analysis are employed, (1) the ASCE design code using a Ramberg-Osgood stress-strain law combined with a full section moment capacity within the interaction formula with nominal levels of loading eccentricity, and (2), the same approach, but using the true eccentricity with reference to the unsupported length of the columns. The results are compared with those obtained from a series of compression tests performed on cold formed stainless steel Type 304 stub columns of lipped channel cross-section for the same conditions.

AB - Stainless steel exhibits highly non-linear behaviour, and in the case of short column structural members, this can lead to substantial conservatism in the prediction of load capacity by design codes due to their use of the 0.2% proof stress as an upper limit of capacity. This paper examines the behaviour of short stainless steel stub columns in which the material follows a Ramberg-Osgood type of stress-strain law. The column length is varied to examine the effects on the load capacity when the column is subjected to varying magnitudes of combined bending and axial compression loading. The loading is applied as eccentric axial loading, with the eccentricity being positive at one end and negative at the other to produce varying moments along the column under load. Two different methods of analysis are employed, (1) the ASCE design code using a Ramberg-Osgood stress-strain law combined with a full section moment capacity within the interaction formula with nominal levels of loading eccentricity, and (2), the same approach, but using the true eccentricity with reference to the unsupported length of the columns. The results are compared with those obtained from a series of compression tests performed on cold formed stainless steel Type 304 stub columns of lipped channel cross-section for the same conditions.

KW - finite element analysis

KW - dynamic loading

KW - stainless steel

UR - http://strathprints.strath.ac.uk/20706/

M3 - Paper

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Macdonald M, Rhodes J. Stainless steel stub columns subject to combined bending and axial loading. 2004. Paper presented at 17th International Speciality Conference on Cold Formed Steel Structures, Orlando, Florida, .