TRUSS RODS DEFORMATIONS DETERMINATION MODEL Russian patent published in 2018 - IPC G01N3/00 G01B5/30 G01B7/16 

FIELD: training means.

SUBSTANCE: invention relates to the visual teaching aids and is intended for use in the educational and research laboratories for theoretical, structural mechanics, building structures as the illustrative demonstration of the rod structures operation, and as the hinged-rod systems models in the design of buildings and structures, during the trusses operation studying. To achieve the technical result, a model has been proposed to determine the truss rods deformations, characterized by the fact, that the truss contains pivotally interconnected rods forming the geometrically immutable pivot-rod system from triangles. Each rod of the system is made to be used as the mechanical strain gauge to determine the deformation type therein under the action of the load in the truss nodes. Rod is formed from two tubular halves, coaxially joined by means of inserted into their openings bushing with possibility of the gap formation between the rod tubular halves joined ends. At that, the bushing part is fixed in one tubular half, and the second tubular half mounted on the bushing with possibility of free movement thereon and fixation. Inside the rod the elastic element is installed, fixed at the rod ends and connecting the tubular halves to each other with a gap filled with brittle material, in particular, gypsum, that does not change shape in the absence of external forces, at that detached or peeled off form the movably installed unfixed tubular part end under the tensile forces action and is squeezed out of the gap under the compression forces action in the rod under study, wherein, in all the rods, except for the studied one, the rod movable tubular half is fixed on the bushing against movement by means of removable retainer, in particular, a locking screw installed in each rod.

EFFECT: technical result consists in expansion of the technical demonstration tools and visual aids arsenal, as well as in simplifying the model for the visual determination of deformations of truss rods without the use of electrical tensometric equipment.

7 cl, 3 dwg