Graduate Thesis Or Dissertation


Load Path Investigation in a Light-Frame Wood House with Complex Geometry Public Deposited

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  • The objective of this study was to investigate load paths in an existing light-frame wood structure with complex geometry, using previously established computer modeling methods. The structural model is derived from an existing, multi-level residence located in Corvallis, Oregon. For the purpose of this study, the existing structure was simplified in some respects, then analyzed using a commercial finite-element software. Modeling methods developed in previous research were used for both gravity and wind loads in accordance with the 2014 Oregon Structural Specialty Code (OSSC), and ASCE 7-10. The modeling and analysis were done using SAP2000 for behavior within the linear elastic range using frame and shell elements. Results from the study showed gravity load paths and the governing load combinations for different parts of the structure. Wind investigations revealed load concentrations at corners and openings due to uplift pressure on the roof, as well as overturning forces from lateral wind loads on the walls. Additionally, load concentrations are dependent on wind direction and the loading type, as well as the amount of dead load present. Load path investigations show that for this asymmetrical structure, the shear carried in each wall is dependent on the wind direction, and the stiffness of the wall. By adding an additional shear wall to the structure, the base shear redistributes with shear wall loads closest to the added shear wall seeing the greatest reductions. Finally, stress concentrations in the roof sheathing under wind loads revealed that a truss extending up the slope of the roof, perpendicular to the other trusses, can cause high stress concentrations due to the stiffness it adds in comparison to the rafters surrounding it.
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