Thesis
Energy-based modeling of dowel-type connections in wood-plastic composite hollow sections
Washington State University
Master of Science (MS), Washington State University
2001
Handle:
https://hdl.handle.net/2376/57
Abstract
The goal of this research was to develop a rational method of designing dowel-type connections for hollow wood-plastic composite sections. Additionally, a method of predicting the load-displacement behavior of a connection with hollow members was developed for use in energy-based design and deformation calculations. A yield model consisting of six controlling yield modes was found to govern the hollow section connection behavior. A model for predicting load-displacement behavior of connections with hollow members was derived for the six controlling modes of the hollow section yield model. The models were validated with double-shear unconstrained bolted connection tests using two wood-plastic composite formulations, three wall thicknesses, and three dowel diameters. Input parameters were also quantified through dowel bearing tests and bending yield strength tests. Dowel bearing tests were completed for each combination of WPC formulation, wall thickness, and dowel diameter. Significant variation in dowel bearing strength with dowel diameter and wall thickness was observed. The hollow section yield model performed well when using a maximum load basis; the average percent difference between the theoretical maximum load and tested maximum load was 5.7%. The maximum connection loads were compared to the theoretical load calculated by entering the dowel bearing strength based on maximum load and a bending yield strength based on the stress in the dowel at the displacement of maximum connection load. Design for WPC hollow section connection maximum loads was based on maximum dowel bearing strength and the 5% diameter offset bending yield strength. The load-displacement behavior model was validated by comparing the predicted and actual work done by the connections to a displacement of 0.11 inches. The Mode Im work prediction was 4.7% less than the actual value. The Mode IV and Mode IIIs equations underpredicted the actual work by an average of 7.6% and 13.2 %, respectively. All Mode IIIs and Mode IV predicted curves were sensitive to the location parameters of the dowel rotation and dowel yielding.
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Details
- Title
- Energy-based modeling of dowel-type connections in wood-plastic composite hollow sections
- Creators
- William Rosse Parsons
- 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, Wash. :
- Identifiers
- 99900524809401842
- Language
- English
- Resource Type
- Thesis