Thesis
Development of strength and stiffness design values for steel-clad, wood-framed diaphragms
Washington State University
Master of Science (MS), Washington State University
2014
Handle:
https://hdl.handle.net/2376/100569
Abstract
Lateral loads are primarily resisted by roof diaphragms and shear walls in post-frame buildings. While a variety of sheathing materials can be used, most often corrugated steel sheets are fastened to the wood frame to form shear walls and diaphragms. The strength and stiffness of these components must be known for proper analysis and design of the building, and are typically derived through small-scale panel tests. This method is costly and may not accurately estimate the strength of full-scale diaphragm assemblies. A mathematical model, typically referred to as the modified MCA procedure, allows analytical predictions of diaphragm strength and stiffness for steel-clad, wood-framed (SCWF) diaphragms. This model is the most accurate procedure to-date for predictions of design values, but the time investment to learn the model and complexity are significant barriers to implementation. The objective of this research project is to provide an independent validation of the modified MCA procedure, and implement the model to develop a full matrix of shear strength and stiffness design values for common constructions of SCWF diaphragms. Predictions from the modified MCA procedure are compared to design unit shear strength and effective shear v modulus values obtained from seven different SCWF diaphragm tests and nine different SCWF shear wall tests. For diaphragms the ratio of predicted to tested design unit shear strength averaged 0.97 and the ratio of predicted to tested effective shear modulus averaged 1.07. For shear walls the ratio of predicted to tested design unit shear strength averaged 0.81 and the ratio of predicted to tested effective shear modulus also averaged 0.81. The modified MCA procedure was used to develop design values for 168 different diaphragm constructions allowing a variety of corrugated steel profiles to be used. Adjustment formulas are provided to more accurately predict the strength of full-scale diaphragms. The design tables and formulas provide a simplified and useful resource for structural engineers to design safer and more economical post-frame buildings.
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Details
- Title
- Development of strength and stiffness design values for steel-clad, wood-framed diaphragms
- Creators
- David Aguilera
- Contributors
- Donald A. Bender (Degree Supervisor)
- Awarding Institution
- Washington State University
- Academic Unit
- Civil and Environmental Engineering, Department of
- Theses and Dissertations
- Master of Science (MS), Washington State University
- Publisher
- Washington State University; [Pullman, Washington] :
- Identifiers
- 99900525108501842
- Language
- English
- Resource Type
- Thesis