DEFORMATION STABILITY OF PVC WINDOWS UNDER TEMPERATURE LOADS

Experience in operating PVC windows in the climatic conditions of the Russian Federation shows that they are subject to significant temperature deformation. Temperature deformations of PVC windows lead to a decrease in their operational and technical characteristics. Nevertheless, at present the calculation of these structures for the action of temperature loads is not performed. This is due, among other things, to the fact that the methods for calculating the plastic deformation of PVC windows under the action of temperature loads have not yet been developed. The development of this methodology is the purpose of the present research. It was proposed to divide a window construction into profile combinations and to consider the profile combination as a single calculation element. By introducing a number of simplifications, a calculation scheme of profile combination was created. A universal form of a system of differential equations describing deformation of a combination of profiles was obtained. A general form solution for this system of equations has been obtained which takes into account temperature bending of window profile elements, impact of IGU rigidity, conditions of profile fixing, point forces and moments, which enables to calculate the strain-stress state o f any structure which can be represented as a set of combination of profiles. A condition limiting temperature deformations of a window structure has been proposed. It consists in ensuring the window seal deformations not exceeding its operating range, which can be verified using the described calculation methodology.