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UBC Theses and Dissertations

Modelling strength and stiffness of glued-laminated timber using machine stress rated lumber Xiong, Pingbo


A localized E-simulation model and a strength simulation model, which are based on the theories of stationary random process and the bivariate standard normal distribution, have been developed. A group of 2x6 2100f-1.8E SPF MSR lumber have been tested to obtain the within-board compressive strengths. The test E-profiles and compressive strength data was used to provide the statistical information for E-simulation model and σ-simulation model. The comparison between the within-board compressive strength test data and the simulation results shows that the E-simulation approach and the σ-simulation approach can model the localized stiffness and strength behaviours satisfactorily. Using E-simulation model and σ-simulation model three grades of MSR lumber have been generated with localized MOE, tension strength and compression strength profiles on each board. With these generated MSR lumbers, different sizes and layups of glulam beams have been built and the effect of beam sizes and layups on the strength of glulam beams has been simulated. The results obtained from glulam beam simulation showed that the beam sizes and layups did have significant effect on the beam strength properties. With one or two layers of higher grade lamination on the outer layer of the beam and lower grade laminations in the rest of inner layers of the beam, the glulam beam bending strength could be improved significantly.

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