The development of wooden structures tends to create systems, types, elements and types of connection that would allow you to save wood while increasing the load-bearing capacity and best take into account its physical and mechanical features. One of the priority directions is the creation of lightweight composite bent structures based on wood. The scientific novelty of the article consists in the study of multi-span continuous composite beams, the use of which is possible both in new construction and reconstruction. Composite multi-span wood-glued beams with the proposed reinforcement scheme are an experimental design and to date, their work is poorly studied. The essence of the proposed design is to strengthen the lower zones in the spans of the beam and the upper zones of the beam at the location of the support with fiberglass on an epoxy oligomer. To perform the calculations, we set a model of a beam with three spans of 1.5 m. the Load is assumed to be evenly distributed along the entire length of the beam. A comparison of the structure to assess its rationality was carried out with an unreinforced glued beam with the same design scheme. The study found that, in contrast to wooden beams, the strength of composite beams with rational reinforcement of stretched zones increases by 24-27 %, and the deformability decreases by 8-13 %. From the point of view of the work, it is proposed to use the method of vacuum infusion, which is proven, which has a positive effect on technical and economic indicators.
The article presents a study of the joint of wooden beams on a new type of aluminum composite connector. For the numerical experiment, beams with a cross-section of 150x220(h) mm made of solid wood were selected. The beams were connected at the same level in a perpendicular direction to each other. The connecting connectors were made of two types of alloys: 7075 T6 and 6061 T6. The experiment was carried out until the joint was completely destroyed under static load. The elastic operation of the node for different types of connectors under study was maintained until the load of 50… 70 kN, after which there was a sharp increase in the deformations of the beams. Conducting a numerical study of the elements of wooden structures made it possible to predict their behavior most accurately in real operating conditions.
We consider the coatings of single-story industrial buildings of frame type, which in a typical solution are made in the form of a flooring of ribbed plates on rafters, trusses or arches. There is a high complexity of manufacturing, transportation and installation of structures and a large height of the coating. We offer truss beams-slabs of box-shaped cross-section, the height of which varies stepwise along the length, being limited by a square parabola at the top. Beams are installed on the substructure structures in a row, and between them on a permanent formwork of wooden boards are arranged monolithic sections of the plate. The calculation of deformations is performed taking into account the inelastic deformation of concrete and rebar in accordance with the recommended norms of state diagrams: three-line for concrete and two-line for rebar. The results of the calculation of a beam-plate with a span of 30 m, which has 5 different stages, the height of which is selected so that the required cross-section of the reinforcement remains constant along the entire length of the structure.
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