SU808639A1 - Prestrained truss - Google Patents

Description

FIELD OF THE INVENTION The invention relates to construction, intended for the coating of buildings, galleries, racks, bridges, as well as for multi-storey swing buildings and other structures. The closest technical solution to the proposed is a pre-stressed cable-stayed farm, for example, to cover buildings with polygonal intersecting by themselves, which consist of separate elements: cables, rods with a clear border on the carriers and strains 1. A disadvantage of the known pre-Te: jtbBO stress farm is the reduction of stress in the tension elements, their bearing capacity is not fully used, the deformability is increased and, consequently, the reliability of the operation of the farms is reduced. The purpose of the invention is to increase the reliability of the cable farm operation. This goal is achieved by the fact that a prestressed tandem truss, for example, for covering buildings, is made of a system of tandem consoles, which consist of at least two cable-stayed and one core element connected at the vertices of the corners loads at the nodes of the connection. FIG. 1 shows a cable-stayed console; in fig. 2 - truss made of cable-stayed consoles; in fig. 3 - the same, made with two d: dimensions of cable-stayed consoles in relation to galleries; in fig. 4 - the same, made with three sizes of cable-stayed consoles; in fig. 5 - gallery span; in fig. 6 - covering the building, made from farms; in fig. 7 illustrates the use in span structures of a truss bridge 7 in FIG. 8 - use of trusses in building coatings. . The prestressed cable-stayed farm includes flexible elements 1 and 2 and tension 3 and 4, as well as supporting elements 5, and flexible and core elements are connected at the vertices of angles 6 and 7, and the cable-stayed farm also has pillars 8 and contour frames 9 With an increase in the span of the truss and the need to install additional racks for hanging the enclosing structures, additional sizes of wack brackets with elements 1, 2, 3, 1, 2, 3 are introduced into the truss.

By acting on single and multi-span trusses of uniform loads, through the supports 8, 8, 3, 3, 3, and 6, the nodes receive elastic displacement and the stressing elements 4, 4, 4 are included in the work (at the same time in elements 2, 2 2 prestress decreases).

By acting on trusses of uneven distributed loads, nodes b, b, b receive different in size elastic displacements and, in addition to elements 4, tension elements are included in the work.

In the superstructure of the gallery, njloc trusses are combined into a spatial one (two in the vertical and horizontal planes with contour frames 9).

For the device for covering the building, the trusses are placed in a cross direction and form a kind of cable-stayed structural slab.

Cable trusses can be calculated by applying known methods for calculating rod and cable structures. In all cases, the thrust from the truss is perceived in the horizontal plane by compressible structures, for example, the roadway of the bridge, or by floors, and in the vertical plane by compressible structures — supports, columns, saws, walls, and the guyed elements that form with it also cable-stayed console.

The thrust from trusses can be repaid by adjacent spans, shelf, anchor supports, detachments and other known methods.

Claims (1)

Invention Formula Pre-stressed farm, eg for coatings buildings, characterized in that, in order to increase the reliability of the truss, it is made of a system of cable-stayed cantilevers, which consist of at least two guys and one core element connected at the vertices of the corners, to absorb the load at the joints . Sources of information taken into account during the examination 1. Streletsky N.S. Metal constructions. M., Gosstroyizdat, 1961, p. 421. . i FIG. Vut.5 five% . V 9i / t, t (Put. 9