The Stability of Wood Composite Wall Panels with Elastically Deformable Mechanical Links

Abstract

AbstractComposite panels with wooden ribs and covers, made of board materials—are the universal enclosing and supporting structures. When such structures are subjected to vertical loads, the main part of the load is absorbed by the vertical load-bearing ribs. Due to the shear resistance of screw connections, part of the load can be absorbed by the sheathing. With relatively large spacing between the fixing points at floor level, an important factor in determining the required cross-sectional dimensions of ribs is to ensure their stability from the wall plane; and considering the joint operation of ribs and sheathing allows the critical compressive force to be significantly increased. The feature of such structures calculating is the necessity to take into account the ties ductility at the seams of the layers. Because of it, the critical force cannot be calculated by the classical Euler formula as for a composite structure with rigid bonds. The presented mathematical model is based on the solution of determinant equation which is obtained from differential equation system of 3-layer composite element considering both mutual shift of layers and shifts of elastic axis from vertical in a given form. The resulting expression allows to determine the value of critical force taking into account major parameters of the composite structure. Considering the sheathing in the framing operation allows increasing the critical force by 70%, which is mainly influenced by the stiffness of the shear bonds. Increasing the thickness of covers does not have the same tangible effect.KeywordsWoodWood composite panelsCompressionStabilitySemirigid connections