The article is devoted to the calculated regulation of the stress deformation state (SDS) of combined steel trusses, which allows to reduce the efforts in some sections of the structure by increasing the efforts in other and design evenly stressed structures as the most rational systems. It is shown that the calculated method of SDS regulation makes it possible to reduce steel consumption by up to 34%. Four methods of calculated SDS regulation are proposed. The advantages of combined structures are given: the concentration of materials and the possibility of designing them as low-element. As shown in the example, for the quantitative criterion of quality it is possible to use rationally the maximum potential energy of deformation. Dependences for calculation of the maximum potential energy of compressed stretched, and compressed-bent elements of rod-bearing steel structures are given.

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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.