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Experimental and numerical comparison of flexural capacity of light gage cold formed steel roof deck : 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 Civil Engineering / by Dawid Gwozdz.

by Gwozdz, Dawid, author., Raebel, Dr. Christopher , DeVries, Dr. Richard, committee member , Huttelmaier, Dr. Hans-Peter , Milwaukee School of Engineering

[Milwaukee School of Engineering], [2017]

Decks -- Testing

Structural analysis (Engineering)

Steel -- Cold working

Thin-walled structures

Buckling (Mechanics)

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

Introduction, literature review and numerical analysis methods -- Experimental program -- Results and discussion -- Conclusions and recommendations -- Appendix A: hand calculations -- B: initial project synthesis documents -- C: material sources and fabrication documents.

This paper presents an analysis of experimental data and compares it to two numerical analysis methods of light gage cold formed steel roof deck. The flexural capacity was determined upon the first failure mode of the light gage cold formed steel roof deck. A comparison of the experimental data was made to both the effective width method and the direct strength method. The objective of the comparison was to have a physical test provide the actual behavior of the light gage cold formed steel roof deck and grade how well the numerical analysis, effective width and direct strength methods, compare against the results. Material testing samples were taken from the steel roof deck and evaluated for the actual yield stress. This allowed for the most accurate comparison between the experimental results with the numerical analysis since the exact yield strength was used in calculation. It was found that the effective width method and the direct strength method vary in their prediction of the nominal moment capacity across material grades and deck thickness but tend to converge to a constant ratio, Mn/dsm/Mn/ewm, at higher deck gages. The effective width method was found to be more accurate for thinner gage steel roof deck, while the direct strength method was found to be more accurate for thicker gage steel roof deck. The effective width method was great at extracting the most strength out of steel roof deck, particularly the thinner gage ones, while the direct strength method was a much quicker process to find the flexural capacity of the deck. Both methods can be used to determine the capacity of the deck and it is up to the end user to determine which method is appropriate for the given application.

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