Forecasting and Comparison of Mechanical Properties of Wooden Structure Models

In this study, different methods were used to compare the mechanical properties of spruce wood. The aim was to evaluate the potential of predicting the properties and behavior of wooden structural elements containing holes and voids. The modulus of elasticity (MOE) was determined using three methods: the static 4-point bending method according to the standard EN 408:2010+A1:2012, the original dynamic transverse resonance vibration method, and the ANSYS design program. The research was carried out in two phases. In the first phase, the dynamic modulus of elasticity (MOEd) of the samples was determined without causing them any damage. In the second phase, the bending resistance and static modulus of elasticity (MOE) of the same samples were determined. Using the ANSYS program and considering the dynamic modulus of elasticity, density, and other parameters, the bending resistance and static modulus of elasticity (MOEa) were predicted. During the first stage of the study, the modulus of elasticity (MOE) was measured for different groups of samples using different methods. The results showed that the average values of MOE differed by up to 4.6 % between the different groups. In the second stage, additional samples were divided into 5 groups, and holes or voids were formed in them according to 5 different schemes. The MOE, bending resistance, MOEa, and bending resistance were determined for each group, and it was found that the average MOE values differed by up to 17 % between the different groups. The presence of holes and voids in the wood increased the anisotropy of the material, which had the most significant impact on the results. Regardless of the number of holes and voids, the damping factor increased by up to 2.1 times.