MODEL FOR DETERMINATION OF ROD DEFORMATIONS OF SPATIAL GRID FRAMING Russian patent published in 2019 - IPC G01N1/36 G01N3/02 G01N3/08 

FIELD: teaching.

SUBSTANCE: invention relates to illustrated study guides and is intended for use in educational and research laboratories for theoretical, structural mechanics, building structures as a presentation of spatial grid framings work, as well as models of hinged-rod systems in the design of buildings and structures, in the study of the work of spatial grid framings. Model contains pivotally interconnected rods that form a geometrically immutable hinged-rod system of triangles mounted on supports. Each rod of the system is designed to be used as a mechanical strain gauge to determine the type of deformation in it under the action of the load in the nodes of the system and is formed of two tubular halves, coaxially joined by means of a sleeve inserted into their openings with the possibility of forming a gap between the joined ends of the tubular halves of the rod. Part of the sleeve is fixed in one tubular half, and the second tubular half mounted on the sleeve with the possibility of free movement on it and fixation. Inside the rod there is an elastic element fixed at the ends of the rod and connecting the tubular halves with each other with a gap filled with brittle material that does not change shape in the absence of external forces, at the same time, the unsecured movably installed tubular half detached or peeled off from the end under the action of tensile forces, and squeezed out of the gap under the action of compression forces in the rod under study, and in all rods except the one under study. Movable tubular half of the rod is fixed on the sleeve against movement by means of a removable retainer.

EFFECT: expanding the arsenal of technical demonstration tools and visual aids, as well as simplifying the model for the visual determination of deformations in the rods of a spatial grid framing without the use of electrical strain-gauge equipment.

7 cl, 4 dwg