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Investigation into a proposed methodology for slender element analysis for hot rolled steel shapes : a report submitted to the faculty of the Milwaukee School of Engineering in partial fulfillment of the requirements for the degree of Master of Science in Structural Engineering / by Matthew J. Graziano.

by Graziano, Matthew J., Milwaukee School of Engineering

Rolling (Metal-work)

Steel, Structural

Strains and stresses

Buckling (Mechanics)

105 leaves : illustrations, some of which are in color ; 29 cm.

Thesis advisor: Dr. Chris Raebel.

Committee members: Dr. Richard DeVries, Dr. Hans-Peter Huttelmaier.

Introduction -- Literature review -- Parametric analysis -- Analytical results -- Conclusions -- Appendix A: Table B4.1 of the current AISC Specifications -- B: Table 1 and Table 2 of the current CISC Specifications -- C: Mathematical conversion of existing AISC expressions -- D: Current AISC expressions for slender stiffened elements.

The focus of this project is to compare the results of a proposed methodology for slender element analysis to different design methods, such as those produced by the Canadian Institute of Steel Design (CISC), and the American Institute of Steel Construction (AISC). A full parametric study is featured, following a review of relevant literature. The results of this project provide a basis for an understanding of the proposed methodology and contribute to the discussions necessary when considering the proposal for adoption into the AISC Specification. The parametric analysis for this report was conducted using Microsoft Excel. For each of the slender members under consideration, spreadsheets were assembled to determine the capacities of each particular member according to the specifications of AISC, CISC, and the proposed methodology. Each slender member under consideration was then analyzed, according to respective specifications, over various lengths in order to determine overall trends and to discover any outliers. Additionally, plots of individual slender members of the four members considered were created by producing a normalized y-axis with respect to yield force analyzed over slenderness ratios maximized at 200. This was completed in hopes of discovering particular trends for each specification pertaining to the four shapes under consideration in this report. The parametric analysis in this report of slender WT and single angle members provided key observations for unstiffened slender elements. It was observed that the proposed methodology provides more capacity for the unstiffened elements under consideration with respect to both the AISC and CISC Specifications. This observation is noted as an overall trend for the unstiffened elements. Through the parametric analysis of both slender stiffened elements in this project, it was observed that the AISC Specifications provided more member capacity with respect to the proposed methodology. In terms of the CISC Specifications, overall trends with respect to the proposed methodology pertaining to the slender stiffened elements in this project were not observed. This report recommends that additional parametric analysis of both stiffened and unstiffened elements must be completed. It is important that future research considers all slender HSS members in an effort to observe particular trends related to the slender stiffened elements. Also, additional shapes need to be considered in a parametric analysis, such as double angles, channels, and variations of built-up members in order to observe any inconsistencies between the methodologies. Due to the nature of the parametric analysis in this report, overall trends for the particular members were exclusively observed. Therefore, future research may also consist of statistical analysis in an attempt to compare the proposed methodology in an effort to provide necessary modifications to produce favorable trends consistent for all steel members. This statistical analysis could require member testing and analysis versus only a parametric analysis of particular members against the design specifications as seen in this report.

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