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Full-scale Tests on Stability of Cantilevered Steel Girders
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- Author / Creator
- Essa, Maha
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Cantilever–suspended-span construction, commonly referred to as Gerber girder systems, is a popular roof-framing system for large single-storey buildings in North America. This system consists of a series of simply-supported girders in the principal framing direction that extend beyond the column as cantilevers, with the portion of the girder between the supports referred to as the back span. Due to the continuity of the cantilever segment over the column support, this system offers several advantages such as ease of erection, reduced moments and lower deflections in comparison to simply-supported beams. Despite these advantages, it has become clear following several collapses in Canada and the United States that the stability response of these systems is complex and in need of further investigation. Moreover, designers use disparate methods for these systems due to the lack of special design guidelines in the U.S. and Canadian steel design standards, despite the wide use of Gerber systems in practice.
To improve the understanding of the stability response of these systems, a full-scale physical testing program was developed consisting of 14 A992 W410×85 single-overhanging girders, with back span and cantilever lengths of 9.14 m and 1.83 m, respectively. The test specimen matrix was developed based on numerical simulations conducted by Esmaeili et al. (2021), which was used to evaluate the influence of various parameters on the LTB capacity of steel cantilevered girders. The design of the test setup was based largely on preliminary FEA simulations of the test specimens which provided the anticipated loads and displacements in the tests. The experimental results for capacity and displacements of each test girder were analyzed, considering the effect of influential parameters such as loading and bracing conditions, residual stresses, and initial geometric imperfections. Finally, the moment resistances obtained from the experiments for each test girder were compared against resistances predicted by the CISC (Lasby 2019) design procedure.
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- Subjects / Keywords
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- Graduation date
- Spring 2024
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- Type of Item
- Thesis
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- Degree
- Master of Science
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- License
- This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for non-commercial purposes. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.