THE STRESS-STRAIN STATE OF THE FOUNDATION IN PERMAFROST CONDITIONS AND ITS EFFECT ON THE FORCES IN THE ELEMENTS OF THE ABOVEGROUND PART OF THE BUILDING

The article considers examples of space-planning and structural solutions of frame buildings during construction in permafrost regions. The most typical schemes and methods of solving problems related to compensation of deformations during cyclic freezing and thawing, temperature influence on the condition of foundations, as well as the compilation of design schemes of foundations and aboveground structures, taking into account the factors of actual operation, are analyzed. The problems of assessing the technical condition of foundations and compiling mathematical models for calculating structures by the finite element method in permafrost conditions are highlighted. A program of numerical experimental studies has been developed that allows obtaining the desired dependencies of the stress-strain state and creating a computational model that adequately corresponds to the actual operation of structures in permafrost. The following are the matrices developed by the authors of varied factors, on the basis of which calculation it is possible to take into account additional factors arising in the structures when the homogeneity of the frozen base is violated. Prerequisites are given for drawing up the most correct calculation scheme for controlling the behavior of foundations on frozen soils. A method of taking into account the possible temperature precipitation of the base on the distribution of internal force factors in the above fundament structure is proposed