Beam

FIELD: building, particularly load-bearing structure of different buildings and building structures.

SUBSTANCE: beam comprises main frame composed of upper and lower belts and stiffening ribs arranged in-between, side walls of corrugated thin sheets connected with the frame so that corrugations of the sheets extend along longitudinal beam axis. Beam also has reinforcing ribs extending along longitudinal beam axis and arranged in side wall corrugations. The reinforcing ribs have flanges unconnected with stiffening ribs and belts along the full beam length or in beam zones characterized by maximal stresses.

EFFECT: increased load-bearing reliability, rigidity and stability in plane of flexure.

2 cl, 4 dwg

 

The invention relates to the field of construction and can be used as a carrier of various buildings and structures.

Known cleanera I-beam or box-shaped cross-section consisting of upper and lower belts, flat thin walls and ribs (Dkhasanov, Unnusual and other Structures of wood and plastics. The textbook for technical schools. - M.: Publishing house of the DIA, 2002, s-128, RES). Known beam is relatively simple in design, but it has a low Flexural rigidity of plane bending, Flexural rigidity of the thin walls in the plane of bending is limited, and the risk of losing their stability is high, which implies frequent step of ribs (0,8...1,5 height of the cross section).

Closest to the technical essence and the achieved effect to the proposed technical solution is a beam with a corrugated wall with different form of corrugations, which includes upper and lower belt, a wall of corrugated sheets, and the corrugations are perpendicular to the longitudinal axis of the beam (V. Gorev, BY Uvarov and other Metal structures. 3 so That 1. Structural elements: Textbook. for builds. higher education institutions. - M.: Higher. HQ., 2001, s-297, RIS). This constructive solution of the beam has a high local stability of the wall, in the possibility to drastically reduce the number of ribs or fully exclude them. However, the bearing capacity of the known beam is limited because of the low rigidity of the thin wall across the corrugations possibility to include it in the overall operation of the beam on the transverse bending, i.e. the wall with corrugations oriented perpendicular to the longitudinal axis of the beam, does not perceive the normal stress, and is only a weak link between the zones.

The technical result to be obtained from use of the invention is to increase the carrying capacity of the beam, the stiffness and stability of plane bending.

The problem is solved due to the fact that beam containing the main frame consisting of upper and lower belts and located between the ribs, while the side faces of the elements of the main frame are in the same vertical plane, the side walls of the corrugated thin sheets, fastened with belts and ribs, corrugations of the side walls are located along the longitudinal axis of the beams, and flutes, the shelves of which is not adjacent to the ribs and belts are reinforcing ribs, oriented along the longitudinal axis of the beam, and the elements of the main frame, reinforcing ribs and side walls, connected between them.

In addition, reinforcing ribs can be located in flutes side walls only in the most stressed areas of the beams.

With mnost invention is illustrated in the drawing, which figure 1 shows a view of the side beams; figure 2 - its main frame with reinforcing ribs; figure 3 - cross section 1-1 figure 1; figure 4 cross-section 2-2 in figure 1.

The beam includes a main frame consisting of upper 1 and lower 2 zones located between ribs 3, bonded with him the side walls 4 of the corrugated thin sheets, the corrugations of which are located along the longitudinal axis of the beams, reinforcing ribs 5, oriented along the longitudinal axis of the beam and located in the flutes of the side walls 4, the shelves of which is not adjacent to the ribs and belts, along the entire length of the beam or only in its most stressed zones.

Beam works as follows. Under the action of vertical load is transverse bending of the beam, with the resulting normal stress perceived by upper and lower belts, side walls and reinforcing ribs. Inclusion in collaboration with the frame side walls and reinforcing ribs located in the flutes of the side walls, the shelves of which is not adjacent to the ribs and belts, is provided by the interconnection of elements (e.g., using adhesive, mechanical connection type nails, dowels, brackets, etc), and also due to the orientation of the corrugations in the side walls and the reinforcing elements along the longitudinal axis balkie orientation of the corrugations of the side walls along the longitudinal axis of the beam is achieved a substantial increase in the Flexural rigidity of the walls in the direction normal stress in comparison with the flat walls of the same thickness sheet or wall with corrugations arranged perpendicular to the longitudinal axis of the beam, due to what they are involved in the overall operation of the design, thereby increasing the moments of inertia and resistance of the cross-section of the beam in the plane of its bending. In addition, in the case of corrugated side walls with corrugations oriented along the span of the beams is achieved by increasing the Flexural rigidity of the walls of the plane of the beam, resulting in increased stability of the beam as a whole when bending out of plane, which allows to simplify the design measures that would ensure the sustainability of the beams from their plane bending, because the distances between the points of the cross arrangement of beams can be increased.

The placement of the reinforcing ribs in flutes side walls, the shelves of which is not adjacent to the ribs and the belt, helps to reduce twice the distance between the points of fastening of the walls in the vertical direction, which provides an additional increase in the Flexural rigidity of the walls in the plane of bending. In addition, by reducing the calculated free length of the corrugations in the vertical direction, there is no danger of buckling walls.

An additional reduction of consumption of materials for the beam can be achieved by placing reinforcing ribs is R only in the most stressed areas - in the middle of the span in the area of the maximum tensile and compressive stresses in the support area in the middle of the height of the cross section in the area of the principal stresses.

1. Beam containing a main frame consisting of upper and lower belts and located between the ribs, while the side faces of the elements of the main frame are in the same vertical plane, the side walls of the corrugated thin sheets, fastened with belts and ribs, characterized in that the corrugations of the side walls are located along the longitudinal axis of the beams, and flutes, the shelves of which is not adjacent to the ribs and belts are reinforcing ribs, oriented along the longitudinal axis of the beam, and the elements of the main frame, reinforcing ribs and the side walls are interconnected.

2. Beam according to claim 1, characterized in that the reinforcing ribs are located in the flutes of the side walls only in the most stressed areas of the beams.



 

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