DEVELOPMENT OF A MODEL OF THE WOOD MATERIAL FOR THE FINITE ELEMENT ANALYSIS OF BUILDING STRUCTURES (Part 1)
Due to the wide spread of engineering analysis systems, software systems are increasingly used for modeling and calculation of wooden structures. In most cases, if possible, the formulation of the problem is carried out in such a way as to neglect the orthotropic properties of the material. However, this approach is not applicable to solving spatial problems. Unfortunately, in the numerical simulation of wood material as isotropic, there is a significant decrease in the accuracy of calculations up to complete inaccuracy. One of the factors affecting the physical and mechanical characteristics of wood is the ambient temperature. In accordance with the current building codes, the operation of wood at temperatures from 0 to +35 °C occurs without reducing the bearing capacity of structures. At temperatures from +35 to +50 °C there is a decrease in load-carrying capacity. At temperatures below 0 °C, the elastic characteristics of the wood increase due to the freezing of moisture, both bound and intercellular, reducing the bearing capacity does not occur. In this paper we consider the process of modeling wood in CAE ANSYS as an orthotropic material. The values of such physical and mechanical characteristics as density, modulus of elasticity in tension along the fibers, modulus of elasticity in tension across the fibers, shear modulus and Poisson's ratio along the fibers, Poisson's ratio across the fibers, as well as the tensile and compressive strength of wood along and across the fibers are determined on the basis of the data of the SP 64.13330.2017 Wooden structures. The updated edition of SNiP II-25- 80 (with Change N 1). With the use of the finite element method and the ANSYS software package, the carrying capacity of the connection of two wooden elements connected by metal gear plates is determined. The configuration of the compound was selected based on the possibility of a full-scale experiment. The bearing capacity is determined taking into account the influence of the ambient temperature for the second group of limiting states, since in such compounds the compliance value is normalized and should not exceed 1.5 mm. The calculation results showed a decrease in the bearing capacity of the compound with an increase in ambient temperature.