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The article investigates the effectiveness of structural solutions for reinforcing steel frames of frames designed to withstand explosive loads. Design approaches for resistance to progressive (disproportionate) collapse are considered. A comparative analysis of options for strengthening and complete replacement of the structure is performed, taking into account the cost of steel, manufacturing and installation work.

This work considers the actual problem of using composite reinforcement in building structures. Traditional steel fittings have some disadvantages, such as susceptibility to corrosion, heavy weight, and the need for frequent maintenance. Composite materials, unlike metals, are lighter, stronger, and less prone to corrosion, which increases the durability of structures and reduces operating costs. In the work, a structural analysis of the composite armature was carried out using modern microscopic methods, making it possible to identify certain structural defects.

This article presents a study of the use of composite materials in strengthening building structures. Materials consisting of two or more components or phases are called composite. Now modern composite materials open up new opportunities for design in all areas of production. The construction industry is no exception. Laminates, canvases, nets, rebars and ropes made of high-strength fibers of various origins are among the most widely used in construction at the moment.

The article examines studies on the reinforcement of reinforced concrete elements of cement -based fibro -based fibro systems (FRC) and polymers reinforcement fibro (FRP). Nowadays, the world economy, and with it, the construction industry is developing at a rapid pace. New materials, mechanization, construction equipment are emerging on the market. Due to this, modern structures impress with their shapes, scale and complexity of structures. The state of construction production in the country can be judged on the state of the economy of this country as a whole.

The research and analysis of technical conditions, deflections, and bearing capacity of subjected to fire impact reinforced concrete slabs of raised “panel per room” typical design model 1-480a of a five-storey residential building in Lviv are present.

The article is devoted to the regulation of the stress-strain state in the compressed elements of steel frames under full operating load. It is proposed to perform reinforcement of such elements with different end eccentricities of load application by rational regulation of the stress-strain state in the reinforcement elements. It is shown that the use of SDS adjustment for frame racks increases their bearing capacity and reduces deformability and welds. The new proposed technology of SDS regulation and possible constructive decisions are offered.

The results of the experimental research of the strength and deformability of normal cross sections of reinforced concrete beams reinforced in tension area with additional sheet reinforcement without the bond.

The results are given on the basis of an experimental research on firmness and deformability of normal sections of concrete beams reinforced with frameless reinforcement and rod reinforcement class A400C without prestressing. These experiments and comparing them with calculations according to current regulations give an opportunity to assess the convergence of the results and draw conclusions about the possibility of rational design of ceramic block bending elements with double reinforcement in the area of the normal forces.

The existing bridge designs and variations of design decisions reconstruction of the bridge expansion monolithic or precast-monolithic concrete slab and enhancement bill beams change their static circuit with a split on a continuous are described.
The existing span structure reinforced concrete, ribbed beam cross-cutting scheme
10 × 16,8 m clearance Г-7 + 2 × 0,9 m was built in 1960–64 years as a pilot facility construction of prestressed beams by Ukrdortrans NDI (now DerzhdorNDI).
Reconstruction span structure included its extension to clearance Г -10 + 2 × 1,0 m