Bending Performance of Spliced, Nail-Laminated Posts With Edge Reinforcement
Kelley, Van C.
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https://hdl.handle.net/2142/86093
Description
Title
Bending Performance of Spliced, Nail-Laminated Posts With Edge Reinforcement
Author(s)
Kelley, Van C.
Issue Date
1999
Doctoral Committee Chair(s)
Riskowski, Gerald L.
Department of Study
Agricultural Engineering
Discipline
Agricultural Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Materials Science
Language
eng
Abstract
Two groups of 3-ply laminated posts were constructed from 2 x 6 visually graded No. 1 Southern Pine lumber. One group of 23 posts was constructed without splice joints with the boards running continuously along the full length of each post. The second group of 23 posts was constructed by first cutting each board in two and splicing it back together forming butt joints without changing the grain orientation of the board. Two toothed connector plates 1 1/2 inches wide by 39 inches long pressed into the narrow edge of each board were used to splice the board back together. The individual bending stiffness about the strong axis of each board was tested before and after making the splice joint. The average gain in bending stiffness for each board that was cut in two and spliced back together was 20.5%. The spliced boards were then nailed laminated together to form a 3-ply post. All posts were loaded with two point loading to determine ultimate bending strength. At the 5% exclusion value, assuming a normal distribution, the spliced posts obtained 82% of the ultimate mid span bending moment of the control group of unspliced posts. Four inch sections of the toothed plate were tested to determine the load-slip relationship of the plates when they were pressed into the edges of 2 x 6 boards. The load-slip parameters derived from testing the 4 inch plate sections were used in a finite element program called FEAST to model the bending performance of the 23 posts that were spliced together with splice plates 39 inches long. FEAST accurately predicted the center span deflection of each spliced post with an average error of 3.5%.
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