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