Renewable energy design is a complex process requiring many different factors to consider. There are many methods for calculating solar heat supply systems, varying in the degree of feasibility of each specific solution relative to its counterparts. Moreover, each design stage is based solely on the determination of the engineering and technical parameters of the selected solar system execution scheme; such important indicators as reliability, load-bearing capacity and operational safety of structural elements on which the elements of solar power plants are located often fade into the background and are even rarely taken into account by agreement with specialists performing related sections (architectural treatment – AT; structural concept – SC). In turn, the latter creates the need to revise the already adopted design options, and sometimes recalculate the developed measures. The solution to this problem is the development of a conceptual design methodology, including the calculation of active solar systems, taking into account not only climatic parameters that affect the performance of solar systems, but also the fundamental influencing factors that form the load on the load-bearing structural elements of the building, as well as entail a change in it. energy model (in particular, thermal protection indicators). At the same time, it is also possible to correlate the architectural and artistic appearance of the building with the accepted layout of the heliofields of active solar systems on the facades and other protruding elements of the building; including inclined facades.

The issues of designing structures from thin-walled profiles with nodal joints on bolts are considered, a method of strength calculation is developed. The calculation takes into account two variants of bolted joints on high-strength bolts and unregulated tightening connections, two variants of the operation of a shear-resistant connection with a “breakdown” when overcoming the force over the friction force of the contact surfaces and without a “breakdown”. The methodology includes the bolted connection splitting for the elements working in tension and compression.

The article shows the process of analyzing and constructing the stiffness matrices for four-node elements in parallelogram and rhombus shapes using the method of potential deformation energy.