The modern building material, slurry infiltrated fiber concrete - SIFCON, has not only high compressive and tensile strength, but also flexibility and ductility. These properties allow it to be used in nodes of building structures that perceive dynamic, shock, explosive loads, friction, as well as in the area of penetration of reinforced concrete slabs by columns. The paper describes experimental studies of the mechanical properties of samples from ordinary concrete and SIFCON. A comparison of the test results showed the superiority of SIFCON strength indicators over ordinary concrete by 2-4 times. For a wide range of specialists and students in the field of construction design, production of building materials.

Keywords: slurry infiltrated fiber concrete, steel fibers, cement mortar, flexibility, plasticity, energy absorption, water-cement ratio, superplasticizer, compressive strength, bending strength, splitting strength

Reinforced concrete flat slabs continue to be one of the most popular floor systems due to the speed of construction and their inherent flexibility in the layout of the premises. However, flat, non-rigid floors are subject to brittle fracture at the junction of the slab and column, which can spread and lead to the progressive collapse of a larger segment of the structural system. The lack of shear strength in two directions may be due to design errors, insufficient strength of the material, or overload.

Keywords: reinforced concrete slab, punching, transverse reinforcement, fiberglass, carbon fiber

This article discusses the results of studies of the behavior of reinforced concrete slabs during punching. The parameters affecting the shear strength of the joints of columns and slabs are considered. Studies of the influence of the strength of concrete, the location of reinforcement, the reinforcement coefficient, the shape and size of the column are given. Various types of reinforcement of reinforced concrete slabs in the punching zone are presented.

Keywords: floor slab, column, punching, shear, bending, transverse reinforcement, dowel action

The article deals with the problem of improving the structural safety of cable-stayed structures . The mechanisms for regulating the risk of accidents of an object at the stages of its construction and operation are presented. The procedure for certifying the requirements of the standard is described. The stages of protection of cable-stayed structures from corrosion are given and the optimal position for increasing the corrosion resistance of ropes and fasteners is presented. Recommendations are given on the possibilities of increasing the operational durability.

Keywords: structural safety, cable- stayed structures , corrosion, rope, anchors, operation, accident, risk, durability

This article addresses the issue of structural analysis using the light steel thin-walled designs based on Eurocode. The main reason for the insufficient use of structures fromLSTC in Russia is described. Some flexibility, coefficients and their values ​​are given. Indicate the necessary types of checks for each design. The article contains information on the methods of joining elements from bent profiles of LSTC. It is also said about the types of design loads on the steel frame construction from profiles.

Keywords: light steel thin-walled designs , calculation, Eurocode, design, truss, arch, belt, section, characteristic, moment, coefficient