The process of optimizing the applied sections in steel frames with elements of variable stiffness, formed from rolled I-beams by their diagonal dissolution and subsequent welding, is considered. A table with groups of I-beams according to GOST R 57837-2017 is proposed, which are advisable to be used together to form a monosymmetrical I-beam of variable height. An algorithm for finding the optimal section is proposed, taking into account the discreteness of the assortment. The calculation of a typical building structure code 828KM according to the proposed algorithm is carried out and a comparative analysis of the applied sections with the found optimized sections is presented. The possibility of obtaining a more economical supporting structure, both in terms of metal consumption and in terms of the cost of rolled products, is noted.

Keywords: variable section, variable stiffness, diagonal opening, I-beam, steel frame

The article considers the possibility of increasing the resistance in sulfate environments of concrete composites based on cement raw mixtures modified with a slag mineral component and a complex superplasticizer. The method of research and modeling of the nature of the impact of an aggressive environment on composites proves the prospects of the technology of chemicalization of cement concretes for the manufacture of durable building structures based on them.

Keywords: sulfate environment, cement concrete, corrosion resistance, chemicalization, composite, environmental impact modeling

The unique building of the Center for Science and Art is modeled as a variant of the complex development of the territory of the old hippodrome in Rostov-on-Don. The analysis of the formation of vertical external communication parametric structures for a spherical object is performed. Based on the results of the consideration of ten forms, a rational form of "Turban" was determined, which retains a constant comfortable slope, and in emergency situations can go into autonomous mode while maintaining the rigidity of the structure. Visualization of the object's integration into the urban environment was carried out in Rhino 3D using the Grasshopper visual programming language program. By combining specialized years, modeling of roads and the volumetric geometry of buildings, the object of study, zoning and reading information from the surrounding area was carried out. The resulting model allows us to evaluate the aesthetics and comfort of the urban environment in the case of construction of a new facility.

Keywords: unique buildings, modeling, parametric architecture, urban environment, grasshopper

The article discusses the geological aspects of the existing and designed anti-landslide protection system of the central part of the Karasan landslide on the Crimean peninsula, where the reconstructed Oryol boarding house is located.

Keywords: landslide, anti-landslide protection system, pile protection wall, retaining wall, Crimea, reconstruction, bored piles

The article substantiates the effectiveness of the design and construction of terraced houses for building slopes as a solution to the problem of a limited amount of land and preserving the originality of national architecture. Architectural and planning solutions for terraced-blocked residential buildings for construction on the territory of the Kabardino-Balkarian Republic are proposed.

Keywords: Residential building, terraced building, complex relief, architectural appearance, block house, social need, national architecture

the article deals with the issues of anchoring external composite reinforcement. The advantages of one of the reinforcement options are described - with the help of anchor harnesses. The procedure for performing work when reinforcing with anchor harnesses is presented. Also presented is a method for calculating pull-out anchors made of carbon fibers.

Keywords: reinforced concrete, concrete, composite materials, carbon fiber, reinforcement, external reinforcement, composite anchor

The article discusses solutions to eliminate obsolescence of the Abakan Hotel, while preserving the historical appearance of the building. The main distinguishing features of the architectural image of the hotel are considered, examples of eliminating moral (functional wear) are given: replacement of wooden floors with monolithic reinforced concrete, arrangement of cores, creation of a frame frame in a docked block, creation of a basement floor instead of existing floors on the ground. Objects with the use of similar design solutions are considered. A variant of reconstruction with an attic floor superstructure is proposed.

Keywords: reconstruction, strengthening, Stalin's Empire style, attic floor, preservation of the architectural appearance, seismic impact