Modern Trends in Construction, Urban and Territorial Planning最新文献

{"title":"Information Modeling of the Administrative Multi-Storey Building Frame Reconstruction","authors":"","doi":"10.23947/2949-1835-2022-1-2-40-48","DOIUrl":"https://doi.org/10.23947/2949-1835-2022-1-2-40-48","url":null,"abstract":"Introduction. The present study is targeting the problem of choosing construction solutions for strengthening the frame of a reconstructed multi-storey administrative building. The object of the study is the former Council of Ministers building in the town of Sukhum, Republic of Abkhazia.Materials and methods. During the examination of the building under study, instrumental and visual inspection methods were implemented, which revealed the significant deflection of the roof slab and of two supporting steel beams, as well as emergence of cracks in the load bearing structures and the destruction of partitions. According to the results of examination the dimensional-planning drawings and a structures’ defects list were elaborated. A spatial finite element model of the building was developed in the LIRA-SAPR software package, taking into account the developed dimensionalplanning solutions for the reconstruction of the facility under study. Loads and impacts were set taking into account the requirements of relevant design standards. The detected defects of the structures’ elements were considered.Results. The dynamic calculation of the building frame by finite element method is carried out. The calculation results analysis has shown that all three forms of oscillations are torsional, which proves the structural solutions of the building frame to be complex and requires additional calculations to ensure reliability of construction solutions. The building frame dynamic loads are set taking into account the requirements for buildings with a complex structure frame. The results of the general static calculation has shown that the load-bearing structures of a building are in operating state except for the roof slab.Discussion and Conclusions. Based on the results of a numerical experiment on modeling the operation of the roof slab, the rational solutions for its reconstruction have been developed, recommendations on considering the seismic impacts on the reconstructed building frame of the Council of Ministers have been given.","PeriodicalId":446647,"journal":{"name":"Modern Trends in Construction, Urban and Territorial Planning","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125180368","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Development of Laboratory-made Compositions of Concrete Based on the Certain Raw Materials and Restrictions of the AKKUYU NPP Construction","authors":"I. Razveeva, S. Ivanchenko, I. Bondarenko, M. P. Kotenko, A. A. Fedchishena","doi":"10.23947/2949-1835-2022-1-1-24-33","DOIUrl":"https://doi.org/10.23947/2949-1835-2022-1-1-24-33","url":null,"abstract":"Introduction. Concrete is one of the materials most frequently used in construction thus the technologies of its manufacturing are being constantly improved. In our article we will develop the laboratory-made compositions of concrete based on the certain raw materials resources and restrictions existing at the construction site of one of the nuclear power plants in the Republic of Türkiye. One of the results of elaborating the concrete composition design technology is the selfcompacting concrete that fosters sustainable construction due to significant reduction of energy consumption. Self–compacting concrete is a type of concrete that can completely fill in the formwork only by gravity, without need for concrete consolidating by vibration. Its high fluidity and filling capacity are its advantages over conventional concrete. Self-compacting concrete has high fluidity, high water retention capacity, good strength. The aim of the study was to obtain the laboratory-made compositions of concrete based on the certain raw materials resources and restrictions existing at the construction site.Materials and methods. The list of raw materials potentially meeting the design documentation requirements has been specified. The concrete compositions using various aggregates were selected, the minimum amount of cement was determined, aimed among other things at corrosion resistance improvement.Results. Based on the restrictions existing at the construction site and according to the results of raw materials analysis including their oxide composition specification, 5 compositions were developed for each of NPP engineering structures.Discussion and conclusions. The study has completed all the tasks set forth, the main of which are: analysis of the raw materials market, laboratory studies of raw materials, specification of their actual physical and mechanical properties, identification of components meeting the standards and requirements, obtaining the laboratory-made compositions of concrete mixtures classified by their designation. The perspectives for further research are indicated.","PeriodicalId":446647,"journal":{"name":"Modern Trends in Construction, Urban and Territorial Planning","volume":"233 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132220661","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A New Method of Strengthening the Compressed Reinforced Concrete Columns Based on the Use of Concrete and Composite Materials","authors":"S. V. Georgie, D. Mailyan, A. I. Solovyeva","doi":"10.23947/2949-1835-2022-1-2-4-12","DOIUrl":"https://doi.org/10.23947/2949-1835-2022-1-2-4-12","url":null,"abstract":"Introduction. For many years strengthening of the compressed reinforced concrete structures was fulfilled by methods based on using reinforced concrete cages and outer metal frames. These are rather time-consuming and expensive processes. The implementation of composite materials in the construction industry made it possible to quicken and simplify the works on strengthening, however with regard to compressed elements it turned to be very resourcedemanding to increase the bearing capacity of rectangular or square section structures. This is primarily due to the limitation in compression strain of the longitudinally located carbon fiber materials and a large decreasing coefficient for transverse composite strengthening. However, the development of new methods of strengthening, including the one considered in this work, will increase the efficiency of composite materials located in the transverse direction by 5–10 times, depending on different variable factors. This article aims to develop and justify a new method of strengthening the reinforced concrete columns by using mixed concrete-composite reinforcement.Materials and methods. This research relies on the results of theoretical calculations. The standard variant of strengthening a compressed reinforced concrete element has been considered and calculated as well as composite materials volume has been specified. Based on the standard calculation results the proposals, which take into account the effect of a new strengthening method, have been made in this article, the detailed methodology of calculation thereof has also been presented. The results of theoretical strength calculations along with comparison of the required volume of reinforcement materials are the key issues in the analysis and drawing conclusions.Results. The research has resulted in development, calculation and justification of the new method of strengthening, which allows reducing the volume of composite materials required for strengthening the compressed reinforced concrete columns.Discussion and conclusion. Three variants of calculating the strengthening of a reinforced concrete column with composite materials have been presented and reviewed in this work. One of which is a standard one, the other two are proposed by the authors. The developed method of strengthening implies rounding of concrete followed by jacketing with composite materials. These roundings can be considered in calculation or can be referred to as structural elements. In any case, the strengthening effect received from the proposed method becomes 5.3 and 10.5 times higher. Besides, further research ideas for continuing the development and study of the method of strengthening the centrally compressed reinforced concrete columns with composite materials are given in conclusion.","PeriodicalId":446647,"journal":{"name":"Modern Trends in Construction, Urban and Territorial Planning","volume":"83 1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134180048","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Flooding Hazard Assessment of Built-Up Lands Using Modern Geographic Information Systems","authors":"M. Prokopová","doi":"10.23947/2949-1835-2022-1-2-23-32","DOIUrl":"https://doi.org/10.23947/2949-1835-2022-1-2-23-32","url":null,"abstract":"Introduction. The construction and operation of buildings and structures on the banks of rivers and other water reservoirs with rapidly changing water level are associated with the hazard of territories flooding and underflooding, which can lead to major material damage and even endanger the life and health of people. It’s very important to make a reliable forecast of floodable and underfloodable zones and to develop possible engineering protection measures for such territories, as well as evacuation or rescue plans for cases of emergency. In this article by the example of 2 allocated for construction potentially flooded plots in the Tuapse district of the Krasnodar region, the quantitative flooding hazard assessment is carried out based on the use of the geographic information system QGIS.Materials and methods. In the study there were used: the analysis of existing methods for assessing underflooding and flooding of territories; the long-term observation materials of the water level in rivers and of the largest floods on the studied plots; the analysis of methods of engineering protection of territories from underflooding and flooding; the hydrogeological and hydrological processes modeling using the modern geo information system QGIS; the development of recommendations for engineering protection of the built-up lands and for design of buildings’ and structures’ bases and foundations.Results. As a result of modeling of the underflooding and flooding processes of 2 plots of the prospective built-up lands of the Tuapse district of Krasnodar region in the geo information system QGIS, the boundaries of potential flooding zones and varying probability water rise levels have been identified. Graphical results of modeling in the QGIS system have been presented and graphs of flooding and underflooding levels have been plotted in given sections and along plot’s outline.Discussion and Conclusions. The boundaries of the most hazardous built-up lands have been identified and the engineering protection measures have been reasoned for them. Recommendations have been developed on design and construction of buildings and structures on the plots taking into account the forecasted hazards of underflooding and flooding.","PeriodicalId":446647,"journal":{"name":"Modern Trends in Construction, Urban and Territorial Planning","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125377217","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}