Dynamic behavior of metal-plate-connected wood truss joints Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/05741v769

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  • The objectives of this research were to evaluate the behavior of actual metal-plate-connected (MPC) tension-splice and heel wood truss joints under seismic loads from the Northridge earthquake (tension-splice joints only) and under loads from a large artificial earthquake (1.0 g's and 0.67 g's maximum horizontal and vertical accelerations, respectively). A proposed sequential phased displacement (SPD) loading standard was used to determine dynamic characteristics of MPC joints: energy dissipation, damping ratio and cyclic stiffness. A sinusoidal loading function was used to determine the effect of cyclic loading on the strength of MPC tension-splice and heel joints. Joints were constructed from 2x4 in. nominal Douglasfir. The size of the metal-plate-connectors for the tension-splice and heel joints were 3x4 in. and 3x5 in., respectively. Strength and stiffness of the MPC joints after the seismic and SPD loadings were compared to those properties in a control group of joints tested to failure under a static ramp load alone. Strength degradation was not observed in the tension-splice and heel joints as a result of the earthquake loading regimes. Stiffness degradation was observed in the heel joint as a result of the large artificial earthquake loads and in both the tension-splice and heel joints as a result of the SPD loading. The SPD loading regime did not affect the ultimate strength of the tension-splice joints, but did reduce the ultimate strength of the heel joints. Dynamic properties, determined from the SPD loading, depended on the magnitude of displacement (displacement increases in amplitude with time). The damping ratio and energy dissipation tend to increase as the SPD loading progresses, whereas, the cyclic stiffness decreases. For design, damping ratios of 4.3% and 3.8% are recommended for the tension-splice and heel joints, respectively. Cyclic loading can have a significant effect on the strength of MPC joints depending on the amplitude of the cycles. Cycles with amplitudes greater than 20% of the mean ultimate strength (determined from the static loading control group) for the tension-splice joints and greater than 35% of the mean ultimate strength for the heel joints tend to reduce the strength.
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  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2010-09-17T18:59:17Z (GMT) No. of bitstreams: 1 KentScottMerrill1996.pdf: 5300809 bytes, checksum: f93db601a12f8c4690d4fc599a52ac58 (MD5)
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  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2010-09-17T18:57:22Z (GMT) No. of bitstreams: 1 KentScottMerrill1996.pdf: 5300809 bytes, checksum: f93db601a12f8c4690d4fc599a52ac58 (MD5)
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