The article discusses the basic principles for choosing multi-purpose design solutions for construction production during a forensic construction and technical expertise, and also presents an algorithm for solving problems of this type. Based on the interpretation of the results of theoretical work and the analysis of judicial practice, a method was obtained that can be used in the conduct of judicial construction and technical expertise to solve the problems of choosing design solutions and materials.

Keywords: judicial construction and technical expertise; building production; design solutions; construction expert; mathematical modeling

In today's Russian society, people with limited mobility often have limited access to urban resources; therefore, ensuring their independent life is an important task for the state and society. The idea of forming a barrier-free urban environment is relevant, which necessitates the creation of modern and promising methods for adapting urban space for people with limited mobility.

Keywords: barrier-free environment, people with limited mobility, accessible urban environment, city territory, infrastructure, government program

The concept of sustainable development of cities determines the relevance of the formation of organizational and technological approaches to the creation and development of urban public spaces in accordance with modern trends in urban planning and the needs of the population. Urban public spaces are the key to the development of a comfortable urban environment and represent the cultural and social aspect of the modern city.

Keywords: urban public spaces, comfortable urban environment, sustainable development, improvement, city territory, infrastructure

The article touches on the relevance of the problem of territory improvement and the role of the state in its solution not only in Russia, but also abroad. Examples of long-term state programs and projects aimed at "improving" urban areas are given, and tasks, deadlines, and responsible persons for the result are defined. The importance of carrying out such activities as reconstruction, renovation and modernization of territories and existing buildings that do not meet a number of modern requirements.

Keywords: improvement of the territory, modernization, state program, regional program, renovation, comfort, formation of a modern urban environment, "improvement" of urban areas

Cities around the world lack land resources, despite the fact that the housing stock is in a state of extreme deterioration. The solution to this problem becomes such a concept as renovation - the process of updating urban space. This mechanism is currently provided for in the Town Planning Code of the Russian Federation, but for a number of reasons its implementation in practice is limited. Renovation is necessary in the prevailing conditions of the modern world in order to adapt the spaces of former industrial zones for their use in an already new format. The vast majority of industrial companies cease to operate within cities, and their territories turn into neglected neglected development, isolated from the urban social environment. The authors of this article reviewed and analyzed the benefits of implementing renovation programs for residents of the Russian Federation.

Keywords: renovation, eco-construction, depressed territories, modernization of urban areas, development of regions, redevelopment buildings

In this article, the problem of the application of high-strength steel reinforcement in flexible compressed reinforced concrete elements is considered. Conditions are considered for establishing the minimum necessary proportion of prestressed reinforcement in flexible columns with pre-stretched reinforcement with mixed reinforcement.

Keywords: concrete, reinforced concrete, structures, technologies, installation, reinforced concrete structures, tension, prestress, beams, reinforcement, efficiency

Effective use of high-strength reinforcement in concrete structures - an important task today. Studies of Russian and foreign scientists have shown that the most expedient are combination of prestressed and untensioned reinforcement in section. When designing the compressed concrete elements with prestressed reinforcement should strive to reduce the amount of pre-tension reinforcement in columns, on the contrary, to increase the pre-compressed in short elements. In elements with pre-compressed steel, untensioned reinforcement is needed, because it provides improving crack resistance during transmission technology process tensile stresses on the concrete and untensioned reinforcement. The percentage of this reinforcement should be the minimum necessary to achieve the required cracking resistance. Minimal amount of pre-tension reinforcement adopted at the level of prestressing (usually the highest) should be taken of the conditions provide the desired crack resistance and rigidness. Later in the article describes main principles the calculation minimum number of prestressed reinforcement in reinforced concrete elements to the presentation requirements of the first, second and third categories crack resistance.

Keywords: concrete, reinforcement, steel, reinforced concrete, prestressing, crack resistance, rigidity, bearing capacity, deformation