Date of Award
Civil and Environmental Engineering
Temple, M. C.,
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The problem of built-up columns has been under investigation since the collapse of the Quebec Bridge in 1907, which occurred due to the failure of the lower chords. It was reported that these elements were not designed as latticed columns. It is widely accepted that built-up columns exhibit reduced shear stiffness resulting in an increase in lateral deflection. This reduction in shear stiffness leads to a reduction in the strength of the column, which may be accounted for by increasing the slenderness ratio of the built-up member to an equivalent slenderness ratio. One of the questions addressed by this research was to determine the appropriate value of this equivalent slenderness ratio. A differentiation was made between the action of a battened and a buttoned column. The second problem tackled was the need to limit the slenderness ratio of the individual members between interconnectors to something less than the slenderness ratio of the integral member. It was found that increasing this slenderness ratio decreased the strength of the column, but this could be accounted for by using the equivalent slenderness ratio. The second concern with increasing the slenderness ratio of the individual members between interconnectors was the occurrence of simultaneous local and global buckling. This interaction could also lead to a decrease in the strength of the column resulting from imperfection sensitivity. An experimental program was designed to investigate these problems. Three groups of specimens were tested. The first two groups were composed of channel sections, interconnected by batten plates, placed toe-to-toe forming a box-like section. The ends were hinged about the axis passing through the web, the X axis, and fixed about the other axis, the Y axis. The specimens with one and two interconnectors buckled about the Y axis, whereas, the specimens with more interconnectors buckled about the X axis. The third group was composed of channel sections, placed back-to-back, interconnected by batten or button plates. These specimens were hinged about the Y axis and fixed about the X axis, and buckled about the Y axis. The specimens of the experimental program were modelled using the finite element method and results were compared.Dept. of Civil and Environmental Engineering. Paper copy at Leddy Library: Theses & Major Papers - Basement, West Bldg. / Call Number: Thesis1997 .E55. Source: Dissertation Abstracts International, Volume: 59-08, Section: B, page: 4298. Adviser: M. C. Temple. Thesis (Ph.D.)--University of Windsor (Canada), 1997.
Elmahdy, Ghada Mohamed., "Buckling of built-up columns." (1997). Electronic Theses and Dissertations. 1332.