SU703637A1 - Metal truss - Google Patents

Description

(54) METAL FARM

one

The proposal relates to the field of construction and can be used in coatings of industrial and public buildings.

The construction of a lattice truss is known, which according to it is formed by a shaped sharp beam (along a sinusoid) 1.

The height of the section along the owl varies in length and the lattice elements are fastened in areas with an increased wall height, which makes it possible to exclude the placement of the gussets at the nodes of the truss.

The closest technical solution to this invention is a metal truss, including a cross section 2.

This structure is formed by cutting I-beams along an oblique line, followed by welding.

The disadvantage of this design is their organic height, which is determined by the height of the original profile, since the cutting is not optimal, since it weakens the lower along with in the places of the most powerful forces.

The purpose of the invention is to reduce the metal intensity due to the optimal distribution of stresses along the lines.

The goal is achieved by the fact that in a metal truss, including lattice elements and over a cross section, the walls are wedge-shaped and are connected by large bases in the middle of the truss flight, and the bevel angle of each wall is determined based on

 slSrhiiir

where k is the allowable stress of the truss material,

N is the force in by ce;

RP is the cross-sectional area of the shelf;

6cm-t-wall thickness sa; hjyn-wall height in sa;

f-- coefficient of buckling. For extended rods.

FIG. 1 shows a farm, a general view; in fig. 2 - beam, cut with an oblique cut along the wall into two parts of a wedge-shaped form, from the coil board;