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Item Information   Holdings       More by this author     Moorhead, William     Subjects     Building, Wooden     Roof trusses     Trusses -- Standards -- United States     Trusses -- Standards -- Canada     Timber joints     Trusses -- Specifications     Plates (Engineering)     MSST Project.     Browse Catalog     by author:      Moorhead, William       by title:      Comparison of modeli...         MARC Display

Comparison of modeling in metal-plate-connected wood roof trusses / William Moorhead. by Moorhead, William Subjects Building, Wooden   Roof trusses   Trusses -- Standards -- United States   Trusses -- Standards -- Canada   Timber joints   Trusses -- Specifications   Plates (Engineering)   MSST Project. Description:  82 leaves : ill. ; 29 cm. Contents:  Thesis advisor: Dr. Douglas Stahl Committee members: Dr. Richard DeVries, Dr. Hans-Peter Huttelmaier Background -- Technical history of MPCWT engineering -- Evolution of the ANSI/TPI standard -- Keys to truss economics: gravity loads and top chord stresses -- Truss modeling - United States standards -- Recent attempts toward further standardization in the U.S. -- Truss modeling - Canadian standards -- Goals for this study -- General approach -- Load combinations used -- Truss configuration selection -- Lumber properties for comparisons -- Heel analog conventions for studied trusses -- Validation and details of generic analysis method -- Result collection and synthesis -- Gravity load analyses -- Wind uplift load analyses -- Gravity analysis conclusions -- Wind analysis conclusions -- Overall conclusions -- Appendix: Wind loading calculations. Several editions of a national standard for metal-plate-connected wood truss design have been issued in the United States going back to 1960. However the current standard does not include language to precisely define how the heel joint region of a roof truss should be modeled in analysis to predict truss performance. The Canadian national standard for trusses does include provisions for the heel joint analog. This study compares results from trusses modeled under three different heel joint analogs, and includes the results from proprietary analysis and design software title. Certain truss types are reported to have much lower combined stresses in the first top chord panel adjacent to the heel joint when the Canadian provisions are used. Truss deflections are not appreciably affected by the various analogs compared. It is common that stresses in the first top chord panel adjacent to the heel joint are most influential in determining required chord grade, and the lower stress levels in the Canadian variations suggest that using the Canadian analog could provide designs with generally lower lumber grade requirements, and hence more economical trusses.   Copy/Holding information Location Collection Call No. Status   Walter Schroeder Library Master's Theses AC805 .M669 2008 Available Add Copy to MyList Format: HTMLPlain textDelimited Subject:   Email to:

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