The presented article deals with flat roofs of triangular trusses with the development of the structural form in one longitudinal direction. Bearing structures of trihedral trusses are used for public and industrial buildings and constructions. Using the modular system as a result of cross structural division of the structures of triangular trusses allows to carry out their safe transportation to the place of storage or construction. The peculiarities of formation of the modular system taking into account structural peculiarities of the layout of spatial trihedral trusses are considered. By the results of a comparative analysis of the deformability of mathematical computational models of three-sided trusses in the roof, the use of pliable module coupling assemblies was substantiated. The possibility of using different element composition of rods within each module of a triangular truss is confirmed.

Keywords: modular system of a trihedral truss, structures of non-centered truss-less knots; spatial-string computational model; deformability of modular systems with rigid and compliant mounting knots, comparative analysis of computational models

The article deals with the structural forms of spanning trihedral trusses used as load-bearing structures of flat roofs of buildings and structures of various purposes. An algo-rhythm for arranging tubular belt bars from rolled elements with layout conditions for a channel and an angle is presented. Based on the results of numerical studies, the stressed elements of the spatial strut system have been determined. Also, based on the results of the comparative analysis of the deformability of the computational model of a triangular truss, the application of prestressing with a mechanical tensioning device on the stops in the ends of the lower longitudinal rod has been substantiated.

Keywords: prestressed trihedral truss, compound profiles of longitudinal cores, non-centred nodes, spatial-core design model, schemes of application of nodal design loads, deformability, evaluation of numerical results

To date, the construction of high-rise buildings is the highest priority in construction. One of the problems in the construction of high-rise buildings is wind loads, which have a significant impact on horizontal movements. The article provides a calculation in the LIRA CAD software package of a high-rise building for wind loads in order to determine the optimal locations of outrigger floors and the type of outrigger floor. The system of outrigger floors serves to reduce the displacement of floors from the effects of wind loads.

Keywords: high-rise building, outrigger, stiffness core, aerodynamics, software package, modeling, wind loads