Introduction. The article tackles the problem of finding the most efficient in terms of metal consumption I-shaped crosssection for creating a frame of variable section. In this paper from various options of creating the variable in length frame elements the authors study the option of creating the elements from the ordinary I-beams by diagonal slitting followed by welding as one of the most technologically advanced one. To obtain the most efficient in terms of metal consumption cross-section, it is proposed to use a monosymmetric I-beam composed of two different assortment items.

Materials and Methods. The review of scientific works related to the topic of designing structures from I-beams allowed the authors to compile a methodology for calculating the optimal section parameters. The implementation of this methodology makes it possible to draw the parameters for finding the most efficient for application cross-sections from the existing assortment of rolled I-beams.

Results. The object considered in this study is a frame of a building designed as the braced frame structure from welded single-span frames with elements of variable cross-section (code 828KM). The calculation was made in accordance with the proposed methodology. The results of the calculation show that the use of a monosymmetrical I-beam, composed of two different I-beams, gives opportunity to use the load-bearing capacity of the section to the fullest extent.

Discussion and Conclusions. In the result of implementation of the proposed methodology, it became possible to reduce the mass of an I-beam of a variable cross-section compared to the serial one used under similar loads. The result of the study allows us to conclude that the use of frames of variable section formed of I-beams of various cross-sections by diagonal slitting and subsequent welding in the construction of industrial frame buildings is highly perspective.

Introduction. Integrated territorial development is one of the key areas in modern urban planning, which main goals are to ensure the sustainable development of cities and settlements and to create a high-quality environment and favorable conditions for people’s livelihoods. The mechanisms of integrated territorial development make it possible to approach the renewal of urban development in a comprehensive manner and provide territories with the necessary infrastructure.

Materials and Methods. Investment projects of integrated territorial development need a pre-project analysis in order to identify the most optimal strategies of its redevelopment and renovation. The pre-project analysis should take into account not only the basic comprehensive assessment indicators, but also identify potential target audience and the main stakeholders of the project needs, which will further increase its investment attractiveness. The pre–project assessment should include factors for evaluation the site according to a set of criteria - urban planning, environmental and economic. The article provides a methodology for the territory assessment by a set of factors that take into account the listed criteria. The research was carried out using the methodology of a systematic approach to the scientific problem of improving the urbanized territories environment quality, methods of subject-logical and comparative analysis, and geoinformation technologies.

Results. Pre-project analysis results of the integrated territorial development area located in the city of Rostov-on-Don are considered in order to identify the most optimal approaches to its further use. The main characteristics of the territory obtained with the help of regulatory and legal documentation, environmental and geological conditions analyzed using a geoinformation system, and economic evaluation criterion, including requests from the intended target audience of the project, are presented.

Discussion and Conclusions. The proposed methodology makes it possible to identify the most optimal ways for the study area development through a systematic approach to the integrated territorial development problem, taking into account the directions of city urban development and the investors and territory future users interests.

Introduction. Projects for the introduction of alternative energy sources are quite large. For its qualitative implementation, it is necessary to find the right approach to the goals and objectives set. The development of the life cycle of a construction object in a short time is a competitive factor in the market. In this study, the model will be built relative to the wind energy system. It will provide an opportunity to track all phases and stages of the life of the project step by step from the beginning of the birth of an idea to complete destruction (disposal).

Materials and methods. The object of the study was a wind power plant, presumably located in the vicinity of an agricultural farm. A comparative analysis of Russian and foreign literature in the field of construction of alternative energy facilities was carried out, all the necessary information was collected and processed to build a life cycle.

Results. As a result of the research, the key qualities of the model were considered, five main stages of the project cycle were identified and analyzed, namely: initiation, planning, execution, control, completion. A complete life cycle of the object of study - a wind turbine was built, in which, with the help of the collected information and its in-depth analysis, seven stages were identified, the essence of each of which is described in detail.

Discussion and conclusion. The proposed life cycle model allows you to identify and assess risks, find a timely solution to reduce them in relation to the components of the system, determine whether the project is cost-effective by analyzing all costs and facilitate control over the implementation of alternative sources based on wind energy.

Introduction. When choosing the optimal heat and electric power generating technology, the most promising in terms of ensuring maximum credibility of obtained results is the method of assessing the environmental and economic efficiency of various objects, which implies the application of the studied object life cycle assessment method to be the initial main stage. The authors tackle the problem of assessing the life cycle of steam and gas turbine CHP plants for selecting the optimal heat and electric power generating technology. The aim of the study is to define the main stages and their corresponding specifications of steam and gas CHP plants’ life cycle as facilities generating heat and electric power within the structure of various purpose urban complexes.

Materials and methods. The authors' research is based on the object life cycle assessment method as well as on the quality management system and the theory of selecting and evaluating the various objects’ environmental and economic efficiency.

 Results. Based on the research, it was found that:

 -CHP plants are of particular interest in terms of selecting the optimal cogeneration technology because many technological types of this energy are implemented there;

 - the life cycle assessment method may well be implemented at CHP plants;

 - the authors have taken a steam and gas turbine CHP plant as an object for the life cycle analysis because it has significant advantage over other similar technologies;

 - the life cycle of a steam and gas turbine CHP plant includes three main stages: construction (erecting, setting-up and commissioning), operation and disposal, which have the largest share in the overall life cycle

; - the most significant processes have been identified for each of the distinguished life cycle stages of a steam and gas turbine CHP plant.

Discussion and conclusion. The performed life cycle analysis led to the conclusion that the life cycle of a steam and gas turbine CHP plant, the one commonly used in real life and representing particular interest in terms of choosing the optimal technology, has three main stages occupying the largest share in the overall life cycle: construction, operation and disposal. Besides, the most significant processes were identified and described for each of the distinguished life cycle stages of a steam and gas turbine CHP plant.

Introduction. In the existing building industry standards and regulations there are currently put into effect the requirements for the spatial rigidity of buildings and structures. For fulfillment of the set requirements various design solutions are used: outrigger systems, edge beams, subrafter constructions etc. Currently the most common design solution for high-rise buildings is integration of the outrigger systems into a building frame.

Materials and methods. The evolution of forming the epicycloid cylindrical surface in the SAPPHIRE software was investigated. Based on the results of the study, the optimal form of a parametric architecture object was determined. Five versions of an object design solutions were developed. Modeling of the elaborated building frames was performed in the LIRA-SAPR software based on the slab-beam design model by the finite element method.

Results. The analysis of static and dynamic calculations results enables to choose the rational version of a parametric architecture object frame and to provide the necessary strength attributed with maximum possible lean consumption of the materials for the outrigger storey. In the course of experiment the efficiency of a building frame dynamic properties regulation is defined, the technical and economic indicators of the proposed versions and design solutions aimed at increasing the overall rigidity of the building are compared.

Discussion and conclusion. A comparative analysis of the dynamic properties regulation efficiency was carried out for each structural scheme. The most rational scheme for a high-rise building was selected, the one meeting the strength and rigidity requirements and proving to be the most material saving. In addition to the efficient dynamic properties regulation, the horizontal stiffening rings were implemented as a constructive solution to prevent and protect a high-rise building from progressing impact which accounts for complete or partial collapse of the building.

Introduction. Today there is no doubt that the city is being transformed thanks to the rapid improvement of the technologizing environment. However, an exclusively technical analysis of the problem emphasizes the role of citizens as direct users and producers of new data. The article is devoted to the analysis of the impact of digital technologies on the modern life of urban residents. Tools to reduce the vulnerability of network urbanism are proposed. The purpose of this study is to search for new methods and means to realize the right of urban residents to a comfortable and safe life with the help of digital technologies, and not in spite of them.

Materials and methods. Previously carried out research in the field of smartization and digitalization of the modern city allowed us to establish that digital technologies are firmly established in the lives of citizens. The tendency to develop the city from the technical side will continue and, moreover, multiply, since it is convenient to entrust most of the routine processes performed by people to technology. In this regard, the fears and risks of scientists are justified, who note the vulnerability of technologies that have not withstood strength tests already during the COVID-19 pandemic. Self-isolation has identified such problems as the insecurity of the safety of user data, fraudulent tricks of the population, and also increased political tension in the "state power-citizens" connection. As a leveling of the undermined trust on the part of urban residents, an agile methodology is proposed, the implementation of which will allow developers to adapt their developments to the actual needs of urban users and treat the release and testing of new products for potential users more humanely. Urban activism as a form of inventory of urban space is considered as an effective tool for solving local urban problems by citizens.

Results. Civic activism as a form of inventory of the city made it possible to establish close cooperation between technologies and people in the struggle for the right to influence the urban environment and accept, or vice versa, reject the decisions made by the city authorities.

Discussion and conclusion. In conclusion, the data obtained by the empirical method of studying the information received from activist users are summarized. The exit of civil society activists from the online space to offline allowed us to establish a hybrid (material and media) form of participation of modern citizens.