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Item Information   Holdings       More by this author     Bonnet, Jeffrey D.     Subjects     Photoelasticity     Joists     Steel, Structural     Strains and stresses     Stereolithography     MSST Project.     Browse Catalog     by author:      Bonnet, Jeffrey D.       by title:      Compression chord an...         MARC Display

Compression chord analysis of a cold-formed steel joist using photoelasticity / Jeffrey D. Bonnet. by Bonnet, Jeffrey D. Subjects Photoelasticity   Joists   Steel, Structural   Strains and stresses   Stereolithography   MSST Project. Description:  76 leaves : ill. ; 29 cm. Contents:  Advisor(s): Dr. Hans-Peter Huttelmaier, Michael McGeen, Dr. Richard DeVries Introduction -- Background and theory -- Methodology and results -- Final conclusions -- Recommendations for future testing -- References -- Project approval form. Photoelastic analysis is an experimental tool which uses polarized light to determine stresses within a material. This project explores the validity and practicality of photoelastic analysis in structural engineering applications. This project was conceptualized from the destructive testing of the welded connection of a cold formed joist. In an attempt to utilize a less wasteful and potentially less expensive alternative, two non-destructive analysis tools are introduced -- finite element analysis (FEA) and photoelastic analysis. The results from FEA and photoelastic analysis of an epoxy coated steel joist are compared to results from destructive. It was found that both FEA and photoelastic analysis did accurately predict the critical failure region from destructive testing. Also, a model of the steel joist was made using a rapid prototyping (RP) technique called stereolithography. The RP model was then compared to the actual steel joist using photoelastic analysis. It was found that if the RP model was epoxy-coated, the stress gradients behaved quite similar to that of the steel joist. In an attempt to explain any inconsistencies in the results between the steel and RP joists, a simplified model is created. Independent tests were performed isolating three variables: material, scale, and orientation. Several unexpected characteristics were discovered in these tests, mostly due to the residual stresses inherent in the RP models. The findings show that photoelastic analysis has potential for becoming a valuable tool in structural engineering, especially for specimens with complex geometries. Perhaps the most important finding was that the accuracy of the photoelastic testing depends greatly on the amount of residual stresses, and if these stresses are minimized, the analysis is more likely to remain linear and thus more quantifiable. Several ideas are recommended to guide those in the future who wish to more qualitatively explore the photoelastic characteristics of RP models.   Copy/Holding information Location Collection Call No. Status   Walter Schroeder Library Master's Theses AC805 .B66 2002 Available Add Copy to MyList Format: HTMLPlain textDelimited Subject:   Email to:

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