INCREASING THE COMPETITIVENESS OF WOOD BEAMS DUE TO DIFFERENT TYPES OF REINFORCEMENT

Abstract

The competition in using different materials in building structures makes it possible to create a variety of designs and architectural forms of buildings and structures for different purposes. However, wood is a material that not only adds visual beauty to the premises, but is also an environmentally friendly material. Wood gives a feeling of cosiness and comfort. Moreover, compared to the same structures made of other materials, wooden structures require the least amount of energy to produce.

   To increase the competitiveness of wood in building and to reduce the disadvantages of this natural material, scientists invented and proposed using glued wood. Reinforcement of wooden beams with steel and later with polymeric reinforcement of a periodic profile made it possible to increase their load-bearing capacity by 1.5-2 times without increasing their actual weight. Symmetrical reinforcement of the profile with values of the reinforcement coefficient within µ = 1.2...3.5% is rational. Reinforcement of wooden beams in the tension zone with high-strength composite tapes and webs, together with the use of high-strength reinforcement of class A600 and higher in the compression zone, makes it possible to further increase the load-bearing capacity of the structure. This combined passive reinforcement enables a timber beam to compete with a reinforced concrete beam in terms of load-bearing capacity.

   The use of pre-stressed combined reinforced timber beams makes it possible to bring the load-bearing capacity of these beams up to the load-bearing capacity of reinforced concrete beams with the same cross-sections, but with 4-5 times less weight. Prestressing of the combined reinforcement makes it possible to increase the bearing capacity in the second group of limit states.