Analytical model to simulate the behavior of notched wood beams (temperate species) under creep behavior in outdoor conditions
Résumé
During their lifetime, wood structures are subjected to loadings and environmental changes, which can lead in some cases to their collapsel. The present paper proposes an analytical model that allows predicting the behaviour of a notched wood beam subjected to a long-term loading (4-points bending) test in outdoor conditions. The proposed model considers the impact of cracks propagations (the specimen is made in a way to allow a linear crack propagation from the notch until total collapse of the beam) and the intensity of the load applied on the beam. The analytical model of the notched beam compliance (JN) is based on the Timoshenko beam theory assumptions which consider the effects of shear and accounts for the geometry of the tested beam. The proposed model shows satisfactory results (good fit between the experimental deflection curves and analytical deflection curves for short period of times (approximatively a month)). Experimental and analytical comparisons however underline the necessity to improve the proposed model in a way to account for the effects of moisture content (MC) variations in the beam during time (which is expected to be the object of a future paper) as well as creep.
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