SU1129306A1 - Glued wooden beam - Google Patents

Abstract

GLUED WOODEN BEAM, including horizontal plates, adhesive layers and reinforcement elements of the support areas, made in the form of corrugated sheets, characterized in that, in order to increase the bearing capacity and strength of the beam by grinding, by reducing the deplanations in the supporting sections, the ends of the beam are made with a zigzag shaped slots to a depth equal to the length of the support zones in which the elements of usi are placed on the glue. laziness. . -

Description

Yu

with

about

X 1

05 X

 2 1 The invention relates to construction and is intended to reinforce the support zones of flexural glue wood elements. The wood laminate is glued, including horizontal plates, assembled into a package and displaced one with another in the pscerex direction, adhesive layers and reinforcement elements on the lateral edges of the beam, formed by grooves filled with a composite material. The residues of this beam are weak. the bearing capacity of the beam is tangential. The closest to the one proposed is a wooden beam, including horizontal plates, adhesive layers and elements forceNIN pripornyh zones, made in the form of corrugated sheets Zj. The disadvantages of the known beam are the weakening of the cleavage areas by gluing flat corrugations between the plates and reducing the carrying capacity of the glue in terms of lateral force and strength under normal stresses. The purpose of the invention is to increase the bearing capacity and durability of the beam by scaling by reducing the deposit in the supporting areas. This goal is achieved by the fact that in a glued wooden beam including horizontal plates, adhesive layers and reinforcing elements of the supporting areas, made in the form of corrugated sheets, The ends of the beam are made with zigzag slots to a depth equal to the length of the support zones in which reinforcement elements are placed on the glue. .

FIG. 1 shows a beam, side view (fragment); in fig. 2 shows section A-A in FIG. one; FIG. 3 shows a beam with a reinforcement element per part of the beam height, side view (fragment); in fig. 4 shows a section B-B in FIG. 3

The glued wooden beam includes horizontally placed plates 1, adhesive layers 2, zig zag-like sheets - reinforcement elements 3 of the supporting sections along the entire height of the beam or its part fixed in slots made at the ends of the beam.

If we assume that the zigzag sheet of metal with SL 850.- 10 kg / cm, the modulus of elasticity

L wood take equal

l4

 U kg / cm2, and

tangents for example / /

nor in wood VA to limit the calculated resistance to spallation R to 15 kg / cm, then the tangential stresses in the sheet at the level of the neutral axis are

 - bli§li.

103

 1275 kg / cm2.

n 10

Thus, the gluing of a zigzag sheet, the material of which 6 The choice of reinforcement elements 3, differing in a much larger modulus of elasticity of the second kind in comparison with wood, causes a significant part of the tangential stresses that occur when loading a glued timber beam, is transmitted by zigzag sheets 3 and this results in a reduction in the tangential stresses transmitted to the wood of the supporting portions. The presence of corrugations does not prevent deformation of the temperature, shrinkage and swelling of wood. In addition, the installation of corrugated sheets in an array of wood eliminates the occurrence of thermal shock, thus, no significant internal stresses arise in the design. In this case, from the point of view of the occurrence of internal stresses, preference should be given to a beam in which the zigzag sheets are glued on parts of the height. Along with this, the joint work of a zigzag sheet and beam, characterized by the condition of joint shear deformations, leads to a significant redistribution of tangential stresses equal to the zigzag sheet from (1) where Tg are the tangential stresses in the wood; the shear modulus of the wood ;, the shear modulus of the zigzag Sheet, has a greater value of the modulus of elasticity of the second order, leads to / an increase in the shear forces perceived by the section. This leads to an increase in the load bearing capacity of beam 1129.

A-A3064 in terms of lateral force, and an increase in its strength under normal stresses and general deformations by eliminating deplanations in the supporting areas.

FIG. 2

Claims (1)

GLUED WOODEN BEAM, including horizontal plates, adhesive layers and reinforcing elements of support zones, made in the form of corrugated sheets, characterized in that, in order to increase the bearing capacity and shear strength of the beam to shear by reducing deplanation in the supporting sections, the ends of the beam are made with zigzag slots on the depth equal to the length of the support zones in which reinforcing elements are placed on the glue, - FIG. 1 1 1129306