Bulletin of Odessa State Academy of Civil Engineering and Architecture最新文献

{"title":"OPTIMIZATION OF PROTECTIVE COATING COMPONENTS OF THERMOMODIFIED WOOD TO THE EXPOSURE OF WATER","authors":"Y. Tsapko, A.Yu. Gorbachova, S. Mazurchuk, O. Bondarenko","doi":"10.31650/2415-377x-2021-84-101-109","DOIUrl":"https://doi.org/10.31650/2415-377x-2021-84-101-109","url":null,"abstract":"Abstract. Paints and varnishes are used to a large extent to protect wood surfaces in outdoor conditions, as they are easy to maintain and reapply. Also, when developing a coating, manufacturers are guided by the need to obtain a number of properties that generally determine its ability to protect against moisture. To obtain a protective coating that meets the specified requirements, it is necessary that the components that make up the coating belong directly to the group of protective materials or form such compounds under operating conditions, be able to adhere to the surface of the product. It was found that thermal modification provides a decrease in water absorption of wood. Additional processing of the wood surface helps to reduce moisture absorption by 2 times, and for samples modified at a temperature of 220 °C – 3 times. Geometric dimensional stability is also improved by a factor of 2. The effect of heat treatment on the water absorption of wood is somewhat less – for samples modified at 190 and 220 °C for more than 10 hours. Protective substances for thermally modified wood provided similar protection of open thermally modified surfaces of wood from the effects of water. The positive effect of thermal modification on a decrease in the level of water absorption has been established. It has been proven that it is temperature that has a significant effect on such changes. Since the protective coating is also susceptible to photochemical degradation, it is very important to renew it in a timely manner in accordance with the manufacturer's instructions for the pleasant appearance of wood surfaces during external use. The optimal ratio of components in the surface layer of thermally modified wood has been determined, which ensures the fulfillment of the task, namely for a mixture of oil and wax: the density of a wood – 724 kg/m3; oils – 70.0%; wax – 17.5%. Therefore, such treatment is beneficial for the protection and aesthetic appeal of wood products.","PeriodicalId":273453,"journal":{"name":"Bulletin of Odessa State Academy of Civil Engineering and Architecture","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117097953","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":"THE INNOVATIVE BREAKWATER STRUCTURE","authors":"S. Rogachko","doi":"10.31650/2415-377x-2021-84-110-117","DOIUrl":"https://doi.org/10.31650/2415-377x-2021-84-110-117","url":null,"abstract":"Abstract. Most of the breakwater structures in various countries of the world are either gravitational or rock-fill types. The most optimal of them are gravity structures in the form of vertical walls. They are less material-capacious, are relatively quick prefabricated and reliably protect the port waters from storm waves. The construction of such structures began in the century before last many of them continue to fulfill their functional purpose. At first, ordinary concrete massifs were used for the construction of such structures, and then ferroconcrete massif-giants. The most ideal conditions for the construction of such structures are rocky soils. Nevertheless, in the world practice of marine hydraulically construction, there are cases of construction of berths and breakwaters of gravity type and on soft soils. Under such conditions, in later times, static loading of soil foundations was used under rubble-mound, as well as the beds themselves, by pre-installing concrete massifs at courses. Then, after stabilization of the subsidence, the masonry was dismantled, the planned-high-altitude position of the rubble-mound was finally corrected and the massifs were set along the courses to the design position, in sections. The duration of this technology took a rather long period of time, so its application in modern conditions seems impossible due to a significant increase in the construction time. In the last century, various technologies for artificial strengthening of soft soils were introduced into engineering practice. They require the use of specialized mechanisms, including those in the marine version. For this reason, the use of such technologies leads to a sharp rise in the cost of construction and an increase in its terms of building. Thus, the problem of build protective structures on soft soils exists at the present time. This problem was solved on the basis of an analysis of the technical condition of the constructed breakwater structures, as well as technologies for their construction in various climatic conditions and regions.","PeriodicalId":273453,"journal":{"name":"Bulletin of Odessa State Academy of Civil Engineering and Architecture","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124198308","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":"MODERN ARTISTIC APPROACHES OF ARCHITECTURAL ORGANIZATION OF PUBLIC AND RESIDENTIAL ENVIRONMENT","authors":"V.О. Praslova","doi":"10.31650/2415-377x-2021-84-7-15","DOIUrl":"https://doi.org/10.31650/2415-377x-2021-84-7-15","url":null,"abstract":"Abstract. The existing problems of emotional-figurative perception of the architectural environment of public and residential buildings and structures, on the one hand, and modern examples of practical activities with very radical ideas about the organization of the architectural environment force us to rethink the theoretical achievements of artistic design. The aim of the study is to systematize existing information about the artistic design of the architectural environment in the context of the development of the artistic image of the architectural environment, formulating the features of modern artistic approaches to organizing the public and residential architectural environment. Materials and methods. Literary and informational sources, comparative analysis, structural and logical modeling, systematization of research results, literary and informational sources, methods of experimental design. Within the framework of the study, the architectural environment a three-tier hierarchical system is considered. Four modern approaches to the artistic design of the architectural environment are proposed: critical, individual, interactive and creative. It is established that the architectural environment is perceived as a multilevel, open developing and interacting with visitors in time and space system. The artistic image of the architectural environment covers all levels of formation and connects them into a single whole. The application of the proposed modern artistic approaches is possible both separately and together. Their harmonious integration in the context of artistic design helps to create an architectural environment that evolves and changes according to the needs of visitors and their own interactive rules of perception. The argumentation of these artistic approaches provides a basis for further study of dynamic processes and prospects for the development of artistic design with the possibility of using the results of research work in the artistic design of public and residential architectural environment. Examples are given.","PeriodicalId":273453,"journal":{"name":"Bulletin of Odessa State Academy of Civil Engineering and Architecture","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131883588","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":"ANALYSIS AND EVALUATION OF COMFORT OF HOUSING COMPLEXES (DEVELOPMENT STUDIES IN WESTERN UKRAINE)","authors":"I. Smadych","doi":"10.31650/2415-377x-2021-84-16-31","DOIUrl":"https://doi.org/10.31650/2415-377x-2021-84-16-31","url":null,"abstract":"Abstract. Architects and urban planners in the process of designing residential areas use building codes that consider the comfort of living only in terms of safety, sanitation and environmental performance. This article highlights the problem of taking into account a number of additional social parameters of comfort that affect the characteristics of living comfort. The structure of a comprehensive analysis of housing is formed by assessing the elements of living comfort. The presented research algorithm includes the consistent use of methods of sociological survey, evaluation and modeling. Having identified socio-psychological factors of comfort of a residential district at different levels of urban assessment (in the context of location in the city system, formation of the surrounding area, spatial and architectural-planning level), 3 residential development projects of Ivano-Frankivsk were assessed. For a comparative analysis, the architectural and planning solutions of residential quarters \"Lemkivsky\", \"Club town 12\", \"Vidensky\" were used, the construction of which began in 2017. This took into account not only the quantitative technical and economic indicators of individual elements of the project, but also qualitative indicators, the measurement of which in normal conditions is a resource-intensive process. As a result of the analysis and the carried-out estimation the graphic model of the complex analysis of a residential quarter is formed that allows to carry out comparison of various design decisions irrespective of size of a site of quantity of housing sections, etc. Using the method of movement to the ideal, a comprehensive analysis of various residential complexes was carried out. The obtained results allow, both at the stage of designing residential neighborhoods and the analysis of operated facilities to assess them in accordance with the needs of people, as well as to balance the indicators of comfort by applying the proposed architectural and planning techniques.","PeriodicalId":273453,"journal":{"name":"Bulletin of Odessa State Academy of Civil Engineering and Architecture","volume":"109 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131950805","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":"ESTIMATION OF DURABILITY AND DEFORMATION PROPERTIES OF CONCRETE AND REINFORCED CONCRETE","authors":"S.І. Rogovyi, L. Tsyhanenko, N. Sribniak, V.M. Lutskovskyi, H. Tsyhanenko","doi":"10.31650/2415-377x-2021-84-49-58","DOIUrl":"https://doi.org/10.31650/2415-377x-2021-84-49-58","url":null,"abstract":"Abstract. The research deals with the main directions of the Reinforced Concrete Theory current improvement on the basis of its incisive analysis. As leading direction in solving such a problem, the modern, well known deformational analytic model is examined. It is implemented on the base of complete experimental diagrams of deformation of different structural materials. The offered methods for improvement of such model suggest the creation and use of the transformed diagrams of deformation of concrete, reinforced elements as well as those structural elements on their basis. The modelling of these diagrams is envisaged on the basis of experimental dependences of complete diagrams for deformation of construction materials taking into account the influence on them of different physical, technological, dynamic and other factors. The general view of the said diagram will be realized by two its branches – ascending and descending, designed by different parametric (key) points. The special interest on the modern stage in development of deformational analytic model presents the design of descending branch of complete diagram on the state of construction material that is recorded by different parametric points. One of the main tasks in designing of such points is standardization of experimental methods in determining the critical values of relative power deformations in the top of a diagram, that correspond to the limit straining of construction material, that does not exceed the board of its durability at a compression. The descending branch of complete diagrams must be designed on condition that the deformation of concrete became consistently waning. The transitional point of this state in sustained and increasing deformation it to be considered as destruction start of material at intensively increasing destructive transformations of its structure. The straining of constructional material on such on-loading area of diagram can diminish to the level of postcritical values, beyond the durability range of stability at a compression, and to correspond to relative deformations in the limit state. Further reduction in tension to the concrete is representative at its dynamic deformation in terms of more intensive development of destructive transformations. Thus the level of relative deformations can increase to the maximally possible values, beyond which a concrete, as structural material, stops to comply with the necessary operating qualities. The long-term experience in initiation, perfection and development of theory of the reinforced concrete, as well as implementation of its modern deformational model of calculation show that there is a number of important vital problems which need to be examined and solved for today. Such problems in the outlined aspect are to be examined in two directions of researches. The first is an improvement of methodology of tests and standardization of methods in obtaining the complete experimental diagrams of the state and the","PeriodicalId":273453,"journal":{"name":"Bulletin of Odessa State Academy of Civil Engineering and Architecture","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132629352","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":"STRUCTURAL ASSESSMENT OF THE BRIDGE № M 044 AT THE END OF RYBNIČNÁ STREET ABOVE THE ROAD II/502 BRATISLAVA-PEZINOK","authors":"P. Paulík, O. Chernieva","doi":"10.31650/2415-377x-2021-84-39-48","DOIUrl":"https://doi.org/10.31650/2415-377x-2021-84-39-48","url":null,"abstract":"Abstract. The paper is focused on the results of the survey and diagnostics of the bridge № M 044 at the end of Rybničná street above the road II/502 Bratislava-Pezinok in the Slovak Republic. The article is the result of the cooperation between the Department of Concrete Structures and Bridges of the Slovak Technical University in Bratislava and the Department of Reinforced Concrete Structures and Transport Facilities of the Odessa State Academy of Civil Engineering and Architecture within the framework of the National Scholarship Program of the Slovak Republic. Data were obtained to assess the technical condition of the structures and the bridge as a whole. As a result of the inspection, the type of destruction of each structural element of the frame and superstructure was determined. A study on the content of chloride-ionic contamination of concrete and non-destructive tests of strength parameters was carried out. A detailed research analysis of the results and recommendations for processing the reconstruction has been proposed. In accordance with the valid regulations, due to the significant deformation in the horizontal plane, the cause of which is not known and due to the gradual loss of the bearing function, we evaluate the construction, and technical condition by the degree: VI ‒ very bad, and immediate reconstruction is required. The service life of the bridge is mainly affected by corrosion and displacement of the bearings, as well as contamination of concrete with chlorides from sanding salts and corroded bearings. Corrosion of the reinforcement in the horizon of 5 years can negatively affect the load-bearing capacity of the bridge and there is also an increased risk of falling pieces of the covering layer of the reinforcement on the road leading under the bridge. The following actions are strongly recommended: replace all bearings; reconstruct the waterproofing of the bridge, roadway, drainage system, expansion join on support no. 4; consider the installation of asphalt expansion joins over support no. 1 and piers no. 2 and 3; clean the entire surface with high-pressure water and apply a remedial coating, that would slow down the corrosion of the reinforcement; renew the areas with the delaminated cover layer with a repair compound. The conclusions about the calculation of load bearing capacity are based on the current technical condition of the bridge found during diagnostics (08/2021). During further operation, it is necessary to pay attention to the state of prestressing and possible opening of joints at the contact of beam segments.","PeriodicalId":273453,"journal":{"name":"Bulletin of Odessa State Academy of Civil Engineering and Architecture","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134456988","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":"MODEL AND METHOD FOR CALCULATING THE RESOURCE OF REINFORCED CONCRETE ELEMENTS AND STRUCTURES","authors":"V. Romashko, O. Romashko-Maistruk","doi":"10.31650/2415-377x-2021-84-59-68","DOIUrl":"https://doi.org/10.31650/2415-377x-2021-84-59-68","url":null,"abstract":"Abstract. The article classifies, identifies and analyzes in detail the main disadvantages of existing models and methods for calculating the resource of building structure elements. A universal model and method for calculating the general and residual resources of reinforced concrete elements and structures that are under prolonged influence to operational loads are proposed. The generalized deformation-force model of the reinforced concrete elements and structures resistance to force effects is represented by an extended system of equations of the deformable solid mechanics. It is shown that the most important force and deformation parameters of the reinforced concrete elements state diagrams at all stages are functionally interconnected not only by rigidity, but by the potential energy of deformation. Therefore, due to the application of the hypothesis of invariability in a unit of volume and independence from the loading mode of the potential energy of their limiting deformation, this model has been developed to the energy level. The main advantages of the developed model of the reinforced concrete elements to force effects resistance in comparison with the existing force and deformation models in determining the resource of such elements are demonstrated. The methodology for calculating the general and residual life of reinforced concrete elements and structures is proposed to be built according to the deflections directly measured during field surveys or the step and width of the opening of normal cracks. In practice, they can be determined by geodetic, photogrammetric or any other means. The combination of the deformation-force model and the energy criterion makes it possible to calculate the general and residual resources of reinforced concrete elements and structures from a unified methodological standpoint. Therefore, the proposed \"energy\" hypothesis is recommended to be used as a universal energy criterion not only for the bearing strength exhaustion of the reinforced concrete elements, but also for limiting their deflections, as well as the width of the normal cracks opening under the action of any duration loads.","PeriodicalId":273453,"journal":{"name":"Bulletin of Odessa State Academy of Civil Engineering and Architecture","volume":"7 14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115261949","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":"POSSIBILITY USING THERMOGRAPHIC CONTROL METHOD TO DETECT CRACKS IN REINFORCED CONCRETE STRUCTURES","authors":"Y. Klymenko, S. Kolesnichenko, K. Polianskyi, A. Popadenko","doi":"10.31650/2415-377x-2021-84-32-38","DOIUrl":"https://doi.org/10.31650/2415-377x-2021-84-32-38","url":null,"abstract":"Abstract. The article presents the study results of the possibility of using thermographic non-destructive testing to search for cracks in reinforced concrete structures. The basis of non-destructive thermal control is the registration of changes in the thermal field that occurs when the thermodynamic equilibrium of object with the environment is disturbed, which appears on the surface, and the nature of which allows obtaining the necessary information. The thermal control method is based on the interaction of the object's thermal field with thermodynamic sensitive elements (thermocouple, photodetector, liquid crystal element, bolometer), which convert the field parameters (intensity, temperature gradient, contrast, radiance) into an electrical signal of the recording device. As a result of the experiment, it was confirmed that the thermographic control method can be used when examining reinforced concrete structures for a qualitative assessment of hidden defects and damages. Thermal imagers with different resolution of the IR image matrix, an infrared thermo hygrometer, and a luxmeter were used as measuring instruments for the experiment. During the experiment, no fundamental difference in the use of thermal imagers with different types of IR matrices was revealed. When using the more accurate Flir E8 thermal imager, the thermogram had a clearer definition of the surface temperature compared to the Flir C2. This feature can be useful for quantifying defects, for example, the depth and size of a crack under a layer of paint, but fundamentally, for high-quality detection of defects and damage, the use of more accurate equipment is not a prerequisite. The authors conclude that the method of thermographic control can be used when examining reinforced concrete structures for a qualitative assessment of the presence of cracks.","PeriodicalId":273453,"journal":{"name":"Bulletin of Odessa State Academy of Civil Engineering and Architecture","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122873075","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":"STUDY OF THE INFLUENCE OF GEOTEXTILE MATERIALS DURING CONSTRUCTION OF DAMS","authors":"H. Slobodianyk, K.Z. Shokot","doi":"10.31650/2415-377x-2021-83-112-121","DOIUrl":"https://doi.org/10.31650/2415-377x-2021-83-112-121","url":null,"abstract":"One of the real and promising ways to expand the range and types of structures for strengthening the slopes of embankments and dams is the use of geotextile materials. In the structures under consideration, they can perform protective, filtering, separating, reinforcing functions and moreover they improve the working conditions of the soil and layers of road pavements on the sides of the road and in the slope parts, increasing their stability. The use of geotextiles makes it possible to develop technically and economically effective design solutions. As the analysis of literature data has shown, soil reinforcement is an effective method for increasing the bearing capacity of foundations at a relatively low cost. Therefore, research, both theoretical and experimental, the development and creation of computational models taking into account the influence of reinforcing elements is an urgent problem. The paper considers the stress-strain state of a bulk dam without and with two options for the location of geotextiles. On the basis of the carried out numerical modeling, it is shown how when using geotextiles, the bearing capacity of a structure increases, while the volume of materials decreases. At the second stage, on the basis of the calculations, the optimal variant of the location of the geotextile material in the body of the structure was selected with the best technical and economic indicators. The research results show that when reinforcing the embankment with open clips in two rows – in the upper and lower parts-the smallest horizontal and vertical movements are obtained at almost the same total stresses. At the same time, the required value of the resistance coefficient is achieved, and the volume of soil is reduced. Thus, it can be concluded that the use of geotextile materials can reduce the cost of basic building materials while increasing operational characteristics and extending the service life of the structure.","PeriodicalId":273453,"journal":{"name":"Bulletin of Odessa State Academy of Civil Engineering and Architecture","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123536948","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":"MODEL TESTING OF THE \"PILE-SOIL\" INTERACTION UNDER AXIAL FORCE","authors":"M. Doubrovsky, V.O. Dubravina","doi":"10.31650/2415-377x-2021-83-102-111","DOIUrl":"https://doi.org/10.31650/2415-377x-2021-83-102-111","url":null,"abstract":"Modern marine structures (berths, breakwaters, offshore platforms, etc.) often include steel tubular piles of essential length (80-100 m and more) that should provide high bearing capacity in case of external axial loads application. Interaction between elements of the system “piled structure – soil media” is not studied sufficiently yet. It relates also to the bearing capacity of the long steel tubular piles of large diameter. One of the interesting peculiarities of long tubular piles behavior is the formation of soil plug at the piles tip. There are a lot of suggestion and methods aimed to increase piles bearing capacity under static pressing load. One of them relates to use of the additional structural element, i.e., the internal diaphragm welded to the internal surface of the pile shaft. Such approach has been applied in some practical cases of marine construction and demonstrated its effectiveness. At the moment there are no researches focused on study of the peculiarities of internal diaphragm application. So proposed research aimed to study two connected processes during steel tubular pile driving: soil plug formation at the tip of the open-end pile and soil behavior under the internal diaphragm fixed inside the tubular pile shaft. To study mentioned processes we provided several series of laboratory experiments fulfilled at the Geotechnical laboratory of the Department “Sea, River Ports and Waterways” in Odessa National Maritime University. In these experiments the model of steel tubular pile has been driven (pressed) into fine sand by mechanical jack. The first series was devoted to determination of the conditions related to the soil plug formation at the pile tip. The next series were aimed to study the influence of the flat rigid diaphragm inside the pile shaft. Obtained experimental results allow to conclude that (a) in the fine sand the plug is formatted at the comparatively early stage of pile installation (in case of our modeling – at the penetration depth of some 4-5 pile diameter); (b) our empirical assessment of the conditions of soil plug formation corresponds to the approaches based on PLR and IFR characteristics; (c) formation of soil plug at the pile tip is followed by decreasing of soil level in the pile shaft relatively its initial value (on completing the plug formation the soil level in the shaft become stable); (d) regarding above mentioned, we may note that in case of use of internal diaphragm on the recommended depth (5-7 pile diameters) there may be no contact between diaphragm and the soil inside the pile (e) application of the diaphragm may lead to increasing of the pile’s bearing capacity. It was proposed (and checked by our tests) the technological improvement based on sand filling into space under the internal diaphragm to provide constant diaphragm-soil contact and related soil resistance.","PeriodicalId":273453,"journal":{"name":"Bulletin of Odessa State Academy of Civil Engineering and Architecture","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126392338","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}