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Measurement and prediction of residual stresses in welded girders
Abstract Residual stresses can have a significant impact on the stability of structural members. In the case of I-section beam elements, such stresses can impact lateral–torsional buckling (LTB) capacity, particularly in the inelastic range. I-sections are typically fabricated by either rolling as a single shape or welding three plates together; residual stress distributions can differ considerably between the two section types. It is therefore possible for a built-up welded girder to have a different LTB capacity than that of a rolled one of identical cross-section. Concerns have been raised that such a difference may render North American steel design standards unconservative for welded girders. Because of the lack of recent physical LTB tests on welded girders, finite element modelling was used as a tool in making this assessment, and the assumed residual stress distributions were based on data from 1970 to 1980 that may not account for advancements in welding technologies and processes since the publication of these data. The paucity of recent residual stress data, however, prevents a direct assessment of these assumed distributions. In this study, residual stress measurements were carried out on a series of four welded steel test girders using the sectioning method. A comparison of the measured distributions with four existing models finds these models to be inaccurate in important ways; an updated model is therefore required for use in numerical simulations of LTB behaviour of welded girders used in industry today.
Highlights Sectioning residual stress measurements were carried out on four welded steel test girders. Measured residual stress distributions were parameterized. Existing residual stress models were shown to be inaccurate for measured girders.
Measurement and prediction of residual stresses in welded girders
Abstract Residual stresses can have a significant impact on the stability of structural members. In the case of I-section beam elements, such stresses can impact lateral–torsional buckling (LTB) capacity, particularly in the inelastic range. I-sections are typically fabricated by either rolling as a single shape or welding three plates together; residual stress distributions can differ considerably between the two section types. It is therefore possible for a built-up welded girder to have a different LTB capacity than that of a rolled one of identical cross-section. Concerns have been raised that such a difference may render North American steel design standards unconservative for welded girders. Because of the lack of recent physical LTB tests on welded girders, finite element modelling was used as a tool in making this assessment, and the assumed residual stress distributions were based on data from 1970 to 1980 that may not account for advancements in welding technologies and processes since the publication of these data. The paucity of recent residual stress data, however, prevents a direct assessment of these assumed distributions. In this study, residual stress measurements were carried out on a series of four welded steel test girders using the sectioning method. A comparison of the measured distributions with four existing models finds these models to be inaccurate in important ways; an updated model is therefore required for use in numerical simulations of LTB behaviour of welded girders used in industry today.
Highlights Sectioning residual stress measurements were carried out on four welded steel test girders. Measured residual stress distributions were parameterized. Existing residual stress models were shown to be inaccurate for measured girders.
Measurement and prediction of residual stresses in welded girders
Unsworth, Daniel (author) / Driver, Robert G. (author) / Li, Leijun (author)
2020-02-27
Article (Journal)
Electronic Resource
English
Residual stress , Steel , Girders , Welding , Sectioning
Residual Stresses in Welded I-Girders Made of Stainless Steel and Carbon Steel
| British Library Conference Proceedings | 2001
| Engineering Index Backfile | 1964