Small-scale modeling of metal-plate-connected wood truss joints Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/r494vn916

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  • The objective of this research was to develop a one-third scale model of full-size (prototype) metal-plate-connected (MPC) wood truss joints using similitude theory. The prototype metal connector plates in MPC joints were modeled using thin galvanized sheet metal and short staples. Truss grade wood material was ripped to one-third scale dimensions to be used as the modeling material. Prototype tension splice joints were modeled with 48, one-quarter inch staples embedded in each model connection with each pair of prototype teeth approximated by a single staple tooth. Heel joints were modeled with 60, one-quarter inch staples embedded in each model heel joint connection. The remaining truss connections were developed from projections based on tension splice joint and heel joint designs. To provide verification of the model material properties, a modulus of elasticity (MOE) study was performed that compared prototype and one-third scale model boards. The results indicated that although the variation in MOE of the model was 11% greater than that of the prototype, the average properties of the model and prototype were similar. One-third scale tension-splice joints were tested and the resulting average design stiffness was within 1% of the prototype joint stiffness, while the ultimate load was 7% lower than the prototype. Stiffness and strength of model heel joints were within 22% and 17% of the stiffness and strength of prototype heel joints, respectively. Finally, ten complete model trusses were fabricated and tested. Model trusses had an average stiffness and strength of 4,450 lb/in and 3,895 lb, respectively, after being scaled up by similitude requirements. These results were compared with the available literature, but exact comparisons were not possible because of different loading conditions and the use of oversized connector plates by some other researchers. The results indicate that it may be possible to model full-size truss connection behavior up to the design load and possibly to failure using small-scale models and similitude theory.
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  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2010-09-17T15:14:59Z (GMT) No. of bitstreams: 1 KittelMark1998.pdf: 19818171 bytes, checksum: 943c53df4565a5058f002534b21c0ef3 (MD5)
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