limiting condition, wood, plastic, beams, composite materials, polymers, deformation, hybrid structures.

The proposed active development of the Subpolar and North-Eastern regions of Russia requires the accelerated creation and development of a special construction industry for vast remote geographic areas with weak soil bases. It is completely clear that mass economically acceptable development in such areas should not be based on the use of collapsible wooden and wood-plastic structures [1,2]. Given the transport difficulties and the high economic value of the “northern deliveries” to these areas, with massive localized development of the inhabited territories, emphasis should be placed on the maximum use of local renewable forest resources. This will require extended special research programs to clarify the specific properties of trees of various nomenclatures as structural materials and to develop methods for calculating and designing elements of wooden structures taking into account specific properties found. Such developments are becoming especially relevant at present, since the problem of reconstructing existing buildings and developing low-rise construction in cities and towns is considered as a socio-political and economic task of paramount importance when providing the population with housing in sufficient quantitative terms and according to the criteria of economic affordability for the majority. Here, an additional useful tool for the mass use of wooden structures can be the construction of roof trusses and the construction of attic floors in various types of residential and office buildings.

Nemirovskii Yuri Vladimirovich, Dr. Sci. Phys. & Math., Professor, Leading Research Worker, S. Khristianovich Institute of Theoretical and Applied Mechanics of the Siberian Branch of the RAS, Novosibirsk, Russia.