In this article, the rational constructive form of the combined steel truss with a span of 30 meters is received, with 59% fewer elements than the typical. Calculated regulation methods are offered stress-deformation state (SDS) combined steel trusses, which make it possible to increase their efficiency. Methods of estimated SDS regulation in combined steel trusses are given: change in the stiffness of the rodsand the creation of eccentricities in the nodes connecting the lattice to the upper belt and supporting eccentricities. Designs of experimental samples of rationally combined trusses are developed. Samples of rational steel combined trusses with a span of 3 meters with SDS adjustment are developedand a reference sample of a combined rational truss. A new method of testing combined trusses using a reference sample is proposed. An experimental plant for testing combined steel trusses has been designed, which allows you to test trusses with SDS rigs simultaneously.
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