Bulletin of Prydniprovs'ka State Academy of Civil Engeneering and Architecture

10-18

Authors: Derevianko V. N., Dr. Sc. Eng., Prof.; Maksimenko А. А., Cand. Sc. Eng.; Begun A. I., Cand. Sc. Eng., Assoc. Prof.; Hryshko H. M., Cand. Sc. Eng., Asst. Prof.

Problem statement . Visualizing the mechanical strength of both pure magnesia stone and aggregate stone with different component ratios provides a three-component diagram. The finishing laboratory of the Academy of Construction and Architecture [1] studied the dependence of strength on the ratio of MgO to MgCl2 solution of different concentrations. The strength Rcompr..28 increases with increasing the solution density and the ratio of MgO content to MgCl2 solution from 0,5 to 1,6. S. I. Kilesso [6] obtained similar results by mixing magnesia cement with magnesium sulphate solution. Purpose. Defining the optimum ratio of magnesia cement mixture components: sealer and comparing magnesia stone structures, formed by the interaction of magnesia cement and bishofit of different density, but with same newgrowths. Conclusion. The developed composition based on magnesite fired (calcined) at 970°C in a SSHOL type electric furnace and high concentration MgCl2 solution (ρ = 1,28 g/sm3) can be used as a matrix for manufacturing construction products for different applications. The increase of MgCl2 solution density from ρ = 1,18 g/sm3 to ρ=1,28 g/cm3 increases the rate of the mixture hydration by 10–20 % (Table. 3). By increasing the sealer density to ρ = 1,28 g/sm3, we reduce the percentage in Mg(OH)2 stone from 5 to 8 times, i. e. from 32 % to 4 % (at 28 days), within different curing times (Table. 4). By using quantitative X-ray phase analysis it has been determined, that with increasing bishofit density up to 1,28 g/sm3 there is formed 5MgО·MgCl2·13H2О in the stone from 1,68 to 2,5 times more, and 3MgО·MgCl2·11H2О from 3,85 to 13 times more than in the structure formed with cement and bishofit with ρ = 1,18 g/sm3 (Table. 3). In a non-reacted residue forsterite makes up ≈13 %, and the rest is MgO, but by 28 days of curing of the cement and bishofit mixture with ρ = 1,28 g/sm3, it has been established, that hardly any magnesium oxide remains, therefore there haven't even been any hairline cracks found on the pats unlike the cement and bishofit stone sample with ρ =1,18 g/sm3, where some through cracks have been observed. In the magnesia stone structure formed with cement and bishofit with ρ = 1,28 g/sm3 by 28 days of curing approximately twice more pentoxyhydrochloride, and over 10 times more trioxyhydrochloride crystallize, as compared to the cement and stone bishofit stone structure with ρ = 1, 18 g/cm3, which results in the difference of the strength values (Table. 4), though not proportionally. Waterproofing value of both structures is less than the standard value (≤ 0,8), consequently, in order to increase Кр (Si) content, furthermore we have to add special modifiers in the mixture composition of cement and MgCl2 solution with ρ =1,28 g/sm3 (Table. 5).

26-32

Authors: Zaiats I. I., Cand. Sc. (Tech.), Ass.-prof.

Problem statement. The design decision represents the description or an assessment of a designed project sufficient for consideration and taking of the conclusion about the end of design or ways of its achievement. The feasibility study on design solutions of construction of facilities assumes determination of cost and duration of their construction. When developing the feasibility study it is necessary to recognize that the construction cost coordinated with contract organization, provided in the approved feasibility study, is a limit for the entire period of design and construction. Preliminary development of the feasibility study is an indispensable condition of the tender. Today in the large cities of Ukraine is more actively carried out process of design and construction of high-rise multipurpose complexes, despite difficult architectural, space-planning, constructive and organizational and technological solutions that is caused by deficiency of the free land plots and their high cost, and, as a result, need of the most effective use of the territory, increase of consumer requirements to quality, comfort and safety of objects. However so far there is no exhaustive scientific justification predicted costs and durations of high-rise construction though these indicators are defining when carrying out the contract auction. For a possibility of adoption of the most rational design and organizational and technological solutions of construction of high-rise multipurpose complexes at systematization of factors which influence process of decision-making and further implementation of the project, for a choice of the better decision uncertainty should consider when carrying out system researches. It will allow to determine the specific weight of influence on result of each of the considered factors with a bigger accuracy. Purpose. Consideration of influence of fundamental and utilitarian uncertainty to the studied processes of construction of high-rise multipurpose complexes. Conclusion. Understanding and registration for potential uncertainties in conducting of analytical research in the field of planning of construction of high-rise multipurpose complexes will significantly improve their effectiveness.

41-48

Authors: Belikov A. S., Dr. Sc. (Tech.), Prof.; Kolesnik I. A., Competitor.

Problem statement. All heat-proof materials can be divided into homogenous – low thermal conductivity (foam, foams, etc.), and composite, laminated – with the presence of mineral media having different thermal characteristics showed the analysis , but in an amount giving a beneficial effect in the presence of thermal insulation of the predominant proportion of radiant body. Studies have shown that in the presence of an equal distribution of the volume of air mass takes place largely pin and convective heat transfer. The analysis methods for determining the thermal properties of materials and their means of measurements showed that the majority of them based on solving the problems of transient heat conduction with heat sources, the geometry of which is not reflected in the calculation formulas. Therefore, a measurement method that allows to determine the thermal performance of building materials walling according to experience directly in a production environment. Purpose – to perform theoretically study the development and application of sensors with ring heater for the determination of thermal properties of building materials walling, which will assess the indoor climate changes, taking into account changes in the environment. Conclusion. The method of solving the problem with the annular heat source results in analytical functions describing the change of the temperature field of the array with the initial and boundary conditions, geometry and thermal power sources. It may naturally be generalized to problems with variable power heat sources, as well as inhomogeneous and isotropic bodies having different thermal performance. Ultimately, as a result of the research we have obtained to determine the dependence of thermal characteristics of the materials studied. On the basis of the calculated dependences we have proposed a sensor, with which, in addition to determining the thermal properties of materials, it is possible to investigate the heat transfer of building structures with the environment in a confined space. At the same time we adopted a functional block diagram of the sensor with a ring heater that allows to evaluate the changes of thermal properties of building materials during the operation.

55-61

Authors: Kontorchyk YU. A., Dr. Sc. (Tech.), Lect.; Zakorko B. V., stud.

Raising of problem. Modern tendency of architecture for development in densely populated cities in Ukraine is closely related to the increase in building height, this is due to the density of urban development, land prices and the ambitions of architects, but the experience of high-rise buildings identified by the SCN V.2.2-24: 2009 as tall buildings from 73,5 m to 100 m inclusive, is small enough that leads to defects and errors in the design - hence determines the relevance of the criteria for determining the complex dismantling and installation work on the reconstruction of buildings of this class. Tall buildings and facilities designed to meet the domestic, industrial and cultural needs of the people. In this regard, you must constantly take care of their preservation during their entire life cycle, consisting of technically correct operation and maintenance. The performance of high-rise buildings can be enhanced through a major overhaul and reconstruction performance. The aim is to improve the reconstruction or modification of functional, structural and aesthetic properties of buildings with a comprehensive view of social and urban problems, as well as economic and technical efficiency of its implementation. When reconstruction is often a need in the superstructure, strengthening the individual designs, eyeliner foundations, and in some cases, shifting buildings. This work is often carried out in cramped conditions, making it difficult to storage of materials, the use of lifting devices, increases the demands on safety, increases the cost and duration of the works. The main factors to reduce the cost is to decide on the basis of well feasibility studies on the choice of working procedures, the use of modern production technology and a clear, coordinated organization of workers [1; 4]. Purpose. Defining criteria for dismantling and installation of construction work on the reconstruction of high-rise buildings and structures in high external constraint. Conclusions. Question reconstruction of tall buildings seem not so sharp due to the weak development of the construction of high-rise buildings themselves, demonstrates this and the lack of literature on this topic, including a relatively young regulatory baza. The time of writing in Ukraine put into operation a total of about 10 buildings, stepped 100 m mark, but these buildings enough to commemorate the arrival of the era of high-rise construction and stimulate the development of the regulatory framework and the literature devoted to the construction so as to further remodeling of the whole class to the reconstruction of high-rise buildings similar to the reconstruction of buildings and other structures, apply similar steps in the preparation of the package design and estimate documentation, preceding and accompanying works, unlike most directly on the selection and the further application of organizational decisions, namely the choice of mechanization schemes dismantling and assembly works of reconstruction, especially storing and organizing the transport of materials. Carrying out work in conditions of reduced external and internal, is likely to continue operation of the building also imposes a number of restrictions on the timing of the works, and requires careful consideration of all the organizational and technical issues for the reconstruction work.

68-75

Authors: Podolinnyy S. I., senior Lecturer; Boldyreva H. G., senior Lecturer; Datskiv D. V., student.

Problem statement. Currently, Ukraine is reform of municipal services. One of the areas is acquired scope of administrative services. Foreign experience gives effective examples of such activities on the principle of "single window". Our country has developed relevant programs on the implementation of this system in daily practice. There is a need in the design and construction of buildings for a new type of administrative agencies. The current regulatory framework design only partly reveals the essence of the problems developers. It is necessary to understanding existing diverse experience of administrative buildings, whose activity is based on new functionality for our country programs. An important aspect of this problem is the need to analyze the influence of ideology of a new type of administrative agencies on features functional organization of internal space. The basis for this analysis are the materials that the results of international experience, creating different types of administrative buildings and complexes based on the principle of "single window". Purpose. Show the main features of the functional program of administrative agencies that use the principle of "single window". The most complete highlights issues of ideological and marketing principles of administrative buildings on a "single window" (AZ "EA"). The development of foreign authors generalizing practical experience [8–11] and in the decisions of public services Ukraine [1; 2; 3] provides a detailed algorithm for the creation of municipal service new type. These sources can serve as a basis for the formation of general ideas about functional program. Analysis of typological characteristics of modern office buildings is given in research [8]. Another source of understanding the functional characteristics AZ "EA" is already available experience in implementation of architectural projects. Conclusion. An important aspect of the restructuring of municipal services is the sphere of administrative services based on the principle of "single window". The regulatory framework for the design of new administrative offices yet. Analysis of international experience to determine the main feature of their functional program: a pronounced binary patterns of activity process. Two distinct autonomous functional zones: front office and back office. Front office de-signed for business effective contact of citizens with office workers. This area should be provided with a high level of comfort for employees and for customers. In the area of back-office processing is carried out in-depth information that comes from traditional office planning schemes.