ТHE MECHANISM OF COMBINED REINFORCEMENT OF GLUED WOODEN BEAMS

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Visnyk LNAU: Architecture and Farm Building 2019 №20: 44-49

ТHE MECHANISM OF COMBINED REINFORCEMENT OF GLUED WOODEN BEAMS

Homon S., Candidate of Engineering Science
Polishchuk M. graduate student
National University of Water Enviromental Engineering

https://doi.org/10.31734/architecture2019.20.044

Annotation

Load-carrying capacity and stiffness of building constructions, made of wood, can be increased at work on the transverse bending by reinforcing them with metal reinforcement. However, recent development of new technologies and high-strength materials use composite armature for the reinforcement of building elements. Carbon Fiber Reinforced Plastic (CFRP) is a composite reinforcement, consisting of polymer resin matrix with longitudinal continuous carbon fibers. Those fibers carry the loads due to their high strength, and the matrix distributes them across all the fibers. Moreover, the use of composite reinforcement has several advantages, particularly low weight, high strength, corrosion resistance, ease of use, etc.

Currently, the actual issue for research is to study joint work of composite reinforcement with steel armature in wooden structures.

The article considers the variant of combined reinforcement of glued wooden beams, using steel fittings in the form of two 12 mm A500S rods and composite reinforcement in the form of a carbon fiber plate Sika CarboDur S-512. Steel fittings were located in the grooves of the compressed beam zone, and the composite was glued to the outside of the stretched zone. Thus, an attempt is made to increase the bearing capacity and stiffness of the reinforced wooden element due to combined reinforcement.

Pine boards with 25 mm thickness and the average humidity of 11-12% were used to make beams. The steel bar reinforcement was glued, using epoxy adhesive with quartz sand filler. Sikadur-30 adhesive was applied to bind the plate to the stretched zone of the wooden element. In order to prevent plates separation, they were anchored, using carbon fiber fabric SikaWrap-230 in the supporting parts of the beam.

The positive result of a well-manufactured glued wooden element with combined reinforcement is primarily achieved by adhering to the requirements of the technological regime in preparation of materials, manufacturing and conducting works on the arrangement of reinforcement.

Key words

glued wood, reinforcement, steel reinforcement, carbon fiber reinforced plastics

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