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

{"title":"MODIFIED SULPHATE-RESISTANT PORTLAND CEMENTS WITH THE ZEOLITE ADDITIVE","authors":"M. Sanytsky, T. Kropyvnytska, R.Yu. Trefler","doi":"10.31650/2415-377x-2022-87-100-107","DOIUrl":"https://doi.org/10.31650/2415-377x-2022-87-100-107","url":null,"abstract":"The article shows that one of the ways to increase the sulfate resistance of cements is to use as an additive of pozzolanic action based on highly dispersed zeolite, which increases the corrosion resistance of concrete. Physical-chemical properties of zeolite tuff as a mineral constituent of Portland cements with the addition of pozzolana are presented. The use of modern grinding technology by separate grinding of Portland cement clinker and natural zeolite in mills with separators of the latest generation allows to obtain high quality Portland cement with zeolite CEM II/A-P 42.5 R PJSC \"Ivano-Frankivsk Cement\", characterized by high early strength. It is shown that the replacement of the clinker component with zeolite leads to a decrease the content of clinker minerals C3S and C3A in cements, which significantly limit the corrosion resistance of cement stone. Highly dispersed zeolite is characterized by increased pozzolanic activity (after 28 days, the absorption of Ca(OH)2 is 200-250 mg/g). Due to pozzolanic reaction with the formation of C-S-H-phases, the content of calcium hydroxide in the paste based on CEM II/A-P 42.5 R is reduced by 2 times compared to Portland cement CEM I 42.5 R. Decrease in the concentration of Ca(OH)2 in cement pastes eliminates the possibility of the formation of a significant amount of ettringite, which causes sulfate corrosion of cement stone. It was found that during the hardening of Portland cement CEM II/A-P 42.5 R under the influence of sulfate and magnesium media, the coefficient of corrosion resistance Ks after 56 days is 1.16 and 0.98, respectively, while for samples based on Portland cement CEM I 42.5 R Ks decreases by 1.2-1.3 times. The results of researches of influence of aggressive environments on corrosion resistance of Portland cement with the increased content of zeolite type CEM ІІ/В-Р 42.5 are resulted. For Portland cement CEM ІІ/В-Р 42.5 the coefficient of corrosion resistance in the conditions of sulphate environment Кс90 = 1.47. Portland cements with zeolite strength class 42.5, modified with superplasticizers of polycarboxylate type, are characterized by high sulfate resistance and should be used for the manufacture of concrete classes C25/30...C50/60 for construction of dams, hydraulic structures, sewers storage of waste from livestock farms, etc. Modified rapid-hardening Portland cements with the zeolite additive provide technical, environmental and economic effects in the manufacture of concrete and reinforced concretes of hydraulic structures.","PeriodicalId":273453,"journal":{"name":"Bulletin of Odessa State Academy of Civil Engineering and Architecture","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124388568","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":"COMPARISON OF FIBER CONCRETE PROPERTIES FOR INDUSTRIAL FLOORS AND ROAD PAVEMENTS WITH STEEL AND POLYPROPYLENE FIBER","authors":"S. Kroviakov, D.Iu. Hedulian, V. Kryzhanovskyi, M. Zavoloka, A. V. Yelkin","doi":"10.31650/2415-377x-2022-87-76-84","DOIUrl":"https://doi.org/10.31650/2415-377x-2022-87-76-84","url":null,"abstract":"The article presents a comparative analysis of the type of dispersed reinforcement effect with steel fiber produced by «Stalkanat-Silur» (50 mm length, ⌀1 mm) and polypropylene fiber «Baumesh» produced by BAUTECH-Ukraine LLC (36 mm length, ⌀0.68 mm) on physical and mechanical properties and failure mode of fiber-reinforced concrete samples for cement concrete pavements and industrial floors. The indicators of strength and durability as one of the most important concrete properties for pavement structures, that are constantly operate under the influence of high dynamic loads were determined. The possibility of using the studied compositions of concrete with structural fiber of different types is analyzed. All concrete mixtures had equal workability S4. For fiber-reinforced concrete mix preparation, Portland cement ПЦ II/А-Ш-500 (CEM II/A-S 42.5 R), crushed stone 5-20 mm and sand with a fineness modulus of 2.75 were used. Polycarboxylate superplasticizer MC-PowerFlow 3200 was used to achieve the required workability of fiber concrete mixtures. It has been established that the use of dispersed reinforcement increases the concrete compressive strength by 13-16%, flexural strength increases by 30-31%, and the abrasion resistance decreases by 31-39%. The use of dispersed reinforcement with «Baumesh» polypropylene fiber in an amount of up to 3 kg/m3 makes it possible to increase the compressive and flexural concrete strength and also to reduce its abrasion resistance on the same scale as the use of dispersed reinforcement with steel anchor fiber «Stalkanat-Silur» up to 25 kg/m3. In this case, from an economic point of view, the use of polypropylene fiber is more appropriate. The optimal content of dispersed reinforcement to increase the strength and abrasion resistance in the fiber-reinforced concrete composition was determined. The fiber-reinforced concrete compositions with steel and polypropylene fibers of compressive strength grade C25/30, and flexural strength grade Btb 3.6, with an increased abrasion resistance were obtained.","PeriodicalId":273453,"journal":{"name":"Bulletin of Odessa State Academy of Civil Engineering and Architecture","volume":"94 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126224311","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":"FORMATION OF POWDER COATING PROPERTIES IN THE SYSTEM \"FILM-FORMING ‒ CROSS-LINKING AGENT\"","authors":"V. Gots, О.V. Lastivka, О.О. Tomin, V. Mehet","doi":"10.31650/2415-377x-2022-87-57-64","DOIUrl":"https://doi.org/10.31650/2415-377x-2022-87-57-64","url":null,"abstract":"The results of the influence of film formers of different types on the formation of the properties of powder paints and coatings based on them was showed. Powder coating are one of the most promising types of paints and varnishes for industrial use. Their main advantages are the absence of solvents, virtually waste-free coating technology (the degree of utilization of the powder in the application is close to 100 %), relative simplicity and efficiency in the production process of the coating. As a result of study it has been revealed that the use of powder coating systems of different chemical nature provides higher physical and mechanical characteristics of coatings in comparison with traditional systems based on liquid acrylic resin, which in its turn allows to consider such systems as an alternative for protection of construction metal products and structures against the mechanical influences. At the same time, it has been shown that a change in the film former and crosslinking agent in the composition of powder systems differently influences the formation of powder coating properties depending on the type of the film former and its characteristics (viscosity, glass transition temperature) as well as the type of the crosslinking agent. The use of systems \"polyester film forming – TGIC\", \"polyester film forming – НАА\" provide high physical and mechanical properties of coatings without deterioration of technological properties of systems, when using film forming with dynamic Brookfield viscosity values within 30oC). In turn, the decrease of the glass transition temperature index and the increase of the resin viscosity index negatively affect the formation of the technological properties of the powder systems and, accordingly, the physical and mechanical characteristics of the coating.","PeriodicalId":273453,"journal":{"name":"Bulletin of Odessa State Academy of Civil Engineering and Architecture","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127242818","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":"SIMPLIFIED NON-DESTRUCTIVE METHOD FOR DETERMINING THE INTEGRITY OF HOLLOW-CORE SLABS","authors":"O. Murashko, A. S. Kalinichenko, A.L. Stebelsky, M.I. Kubiiovych, V. Voloshchuk","doi":"10.31650/2415-377x-2022-86-47-53","DOIUrl":"https://doi.org/10.31650/2415-377x-2022-86-47-53","url":null,"abstract":"The article presents the results of analysis of reinforced concrete hollow-core prestressed bench non-formwork molding floor slabs, manufactured using extrusion technology for defects formed as a result of a combination of a number of climatic effects during the construction of the building. The appearance of this kind of defects is quite common in construction practice. The issues of eliminating the causes of such defects, as well as strengthening damaged ceilings, are not the subject of this study. The purpose of the analysis was to identify damage to concrete and damage to the integrity of the slab ribs, which are not always available during visual screening. Existing methods of non-destructive testing with the help of specialized equipment make it possible to determine the strength of concrete as well as the presence of cracks and their configuration in products. The disadvantages of such methods include: high cost of equipment, the necessary level of qualification of specialists using it and the impossibility of its use for mass verification of the integrity of slabs. Therefore, it became necessary to develop a method for detecting defects in prefabricated structures for prompt inspection at the construction site. The proposed method makes it possible to quickly check the presence of significant defects in the construction due to sound audible analysis from strikes by a hammer on the slab. The simplified method of determining the integrity of hollow-core slabs makes it possible to narrow the volume of thorough and time-consuming instrumental studies during a complete inspection of the object, allocating places that need a thorough examination of damaged areas of structures from the total volume of prefabricated slabs of the object. According to the results of the research, it was determined that sound can be divided into three main types that characterize the nature of the structure defect: voiced sound indicates that the structure is not damaged, thud sound - the structure is damaged by near cracks, intermediate sound - the structure has deep cracks, mainly in a vertical rib.","PeriodicalId":273453,"journal":{"name":"Bulletin of Odessa State Academy of Civil Engineering and Architecture","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124655849","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":"DETERMINATION OF CARRYING CAPACITY OF TWO-WOOD REINFORCED CONCRETE COLUMNS IN DIRECT DAMAGE","authors":"Y. Klymenko, E.V. Maksiuta","doi":"10.31650/2415-377x-2022-86-24-34","DOIUrl":"https://doi.org/10.31650/2415-377x-2022-86-24-34","url":null,"abstract":"Based on the field studies and determination of the parameters of the stress-strain state, as well as the nature of the operation of reinforced concrete I-beam columns damaged during operation and during hostilities, a general method for determining the residual bearing capacity of elements was created. The article presents a method for determining the residual bearing capacity of damaged compressed reinforced concrete columns with direct damage, when the damage front is parallel to one of the main axes of the section. The prerequisites for the calculation of damaged reinforced concrete I-columns are proposed: the hypothesis of flat sections is accepted; stresses in the compressed zone are distributed uniformly with intensity ηfcd; the stresses in the reinforcement are taken depending on the height of the compressed zone of concrete, the forces in the tension zone are perceived by the reinforcement and are taken no more than the design tensile strength ft; the work of tensioned concrete is not taken into account; the condition of parallelism of force planes is accepted (the plane of action of external and internal forces are the same or parallel, depending on the design case); the reduced bearing capacity of exposed reinforcing bars is taken into account; damage front is a straight line. Equilibrium equations are composed. The proposals set forth in the article are based on the main provisions of the current norms and expand the scope of their use. The proposed method for determining the residual bearing capacity of reinforced concrete compressed elements of the tee profile, damaged during operation, is statistically justified and reliable. This allows the calculation method to determine the possibility of further trouble-free operation of structures or the need for their strengthening or reconstruction. A system of equations has been created that takes into account all the variety of shapes and sizes of the cross section of the element as a whole, the shapes and sizes of the compressed concrete zone. The reliability of these proposals is confirmed by comparison with data obtained experimentally, and statistical processing of such a comparison. The deviation variation coefficient is 0,125.","PeriodicalId":273453,"journal":{"name":"Bulletin of Odessa State Academy of Civil Engineering and Architecture","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116982429","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":"AUTHOR'S METHOD FOR DETERMINING THE BEARING CAPACITY OF INCLINED SECTIONS OF BEAM STRUCTURES UNDER REPEATED LOADS","authors":"Yu. A. Somina, V. Karpiuk, A. Kostiuk","doi":"10.31650/2415-377x-2022-86-69-77","DOIUrl":"https://doi.org/10.31650/2415-377x-2022-86-69-77","url":null,"abstract":"Analysis of the results of both our own tests and studies of other scientists shows that the destruction of structures under the action of repeated loading occurs at lower stresses than the destruction of structures under the action of short-term static loads. Namely, the bearing capacity of beams under the action of cyclic loads is on average 10% lower compared to the bearing capacity of their \"twins\" under static forces, that must be taken into account when calculating and designing structures. In this regard, the author's method for calculating inclined sections of reinforced concrete beam structures under low-cycle and multi-cycle loads is presented in the paper. Repeated loads are proposed to be taken into account by calculating the fatigue strengths of the beam’s materials, namely the compressed zone of concrete above the critical inclined crack, the longitudinal reinforcement at the intersection with the inclined crack, as well as the anchoring of the longitudinal reinforcement. In particular, the design lines of endurance of concrete and reinforcement are considered. In practical calculations, the change in stresses that occurs due to the development of vibrocreep deformations of compressed concrete at complex stress state is taken into account by the functions of stress accumulation in concrete, longitudinal and transverse reinforcement. These functions of deformations of concrete vibrocreep are calculated according to the theory of vibrocreep. According to the results of the research, the corresponding author's expressions and dependencies are derived and presented, which allow determining the limit forces of structural element with a given shear span. In addition, it is proposed to introduce the coefficient kcyc into the calculation, which takes into account the more destructive effect of a multi-cycle load compared to a low-cycle repeated one. Thus, kcyc is the ratio of the breaking shear force to the minimum design ultimate endurance force of the near support sections of the specimens-beams, calculated using the characteristic values of the strength of concrete and reinforcement, that is, the prismatic strength of concrete and the yield strength of reinforcement.","PeriodicalId":273453,"journal":{"name":"Bulletin of Odessa State Academy of Civil Engineering and Architecture","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129409327","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":"STRESS-STRAIN STATE OF REINFORCED CONCRETE PIPES UNDER THE INFLUENCE OF CLIMATIC TEMPERATURE CHANGES IN THE ENVIRONMENT","authors":"R. Rybak, V. Коvalchuk, B. Parneta, O. Parneta, O. Bal, V. Boiarko","doi":"10.31650/2415-377x-2022-86-54-61","DOIUrl":"https://doi.org/10.31650/2415-377x-2022-86-54-61","url":null,"abstract":"The research analysis on determining temperature fields, stresses and deformations of transport structures under the influence of variable climatic temperature changes in the environment is carried out. It is established that climatic temperature changes in the environment cause the occurrence of temperature stresses and deformations of transport structures. The main damages and defects of reinforced concrete pipes in operation are given. It is established that one of the causes of defects and damages to reinforced concrete pipes is the level of temperature stresses and deformations that occur in the contact of a metal structure with a reinforced concrete pipe due to the action of variable temperatures caused by climatic temperature changes in the environment. A finite element model is developed for estimating the temperature fields and stresses of reinforced concrete pipes reinforced with metal corrugated structures, taking into account the action of variable climatic temperatures of the environment. The distribution of temperature fields in the transverse and longitudinal directions of reinforced concrete pipe under the action of positive ambient temperatures is calculated. It is established that the temperature field will be unevenly distributed over the pipe surface. In the transverse direction of the pipe, a temperature difference of +10° C was recorded between the reinforced concrete and metal shells. The calculation of temperature stresses and deformations of the pipe under the action of positive ambient temperatures is performed. It is established that the maximum value of normal stresses occurs at the contact of a metal pipe with a reinforced concrete one. At the same time, the value of temperature stresses in the transverse direction of the pipe is 321.61 kPa, in the longitudinal direction it is 321.61 kPa and in the vertical direction, it is 253.84 kPa. It is established that improving the theory and practice of determining the impact of climatic temperature changes on reinforced concrete pipes in the future will allow using appropriate materials and methods to strengthen these structures that meet the real conditions of pipe in operation, which will cause an increase in the service life of these structures in operation.","PeriodicalId":273453,"journal":{"name":"Bulletin of Odessa State Academy of Civil Engineering and Architecture","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115859382","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":"PRINCIPLE OF FORTE AND PIANO IN THE DESIGN OF THEMATIC ENTERTAINMENT CENTERS","authors":"D. Pishchev","doi":"10.31650/2415-377x-2022-86-8-14","DOIUrl":"https://doi.org/10.31650/2415-377x-2022-86-8-14","url":null,"abstract":"All the types of creativity have intersection points. The architecture requires composition, sculpture, color, graphics, etc. And the connection between music and architecture, in the nineteenth century, the German art theorist Schelling, and then in the twentieth century Gaudi embodied it into the Sagrada Familia on the facade of \"Nativity\". However, the direct use of music, tune or any sound theme that is relevant to the complex theme, and which will not only be episodic sound, but really will be embodied into architecture, where it will be heard not at the acoustic level, but at visual or tactile ones – there is not such an equipment now. The principle of forte and piano, or the principle of volume, was chosen as the most suitable for this study, due to the simplicity of the analysis, which does not require music university education. The free online software chrome.soundation.com is used for the analysis of any musical compositions. The goal of the research is to combine the musical principles of volume, forte and piano, the design of thematic entertainment centers. Designing individual parts, or whole complexes, taking into account the central melody, if it exists, will give additional immersion into the theme of thematic entertainment centers. It should analyze the structure of existing thematic entertainment centers and their coincidence with this hypothesis. The scientific novelty of the research is that the regularity and possibility of applying this method allow you to get a working tool that will help during designing of thematic entertainment centers. This method will make it possible for the architects to influence not only on the conscious perception of space, but also on the subconscious. Thus, many people perceive music not only as the sound, but if we move people through space that corresponds to a specific tune and designed using this tune – people will be able to feel architecture with two different sensations at once. This article can also be the basis for more detailed research for people with music university education, and the extension of this method.","PeriodicalId":273453,"journal":{"name":"Bulletin of Odessa State Academy of Civil Engineering and Architecture","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114668062","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":"DEGRADATING CONCRETE AND REINFORCED CONCRETE BUILDING STRUCTURES AND LONG-TERM STRUCTURES","authors":"J. Luchko, B. Nazarevich, V. Коvalchuk","doi":"10.31650/2415-377x-2022-86-35-46","DOIUrl":"https://doi.org/10.31650/2415-377x-2022-86-35-46","url":null,"abstract":"The problems of degradation of concrete and reinforced concrete constructions of buildings and constructions of long operation are formulated on the basis of the performed field researches and its urgency is noted in the work. The authors analyzed a number of works on this problem. In particular, the results of technical diagnostics of many buildings and structures, both newly built and long-term operation, are described. The necessity of periodic technical diagnostics is noted. Based on these studies, the main factors that significantly affect the reduction of load-bearing capacity of reinforced concrete structures of buildings and structures are summarized and found that they are as follows: design errors, defects and shortcomings of construction and operational shortcomings of buildings and structures. Also, using modern technologies and materials, the authors identified the benefits of their use for repair and restoration of concrete and reinforced concrete structures at a number of long-term facilities. Relevant conclusions have been formulated on research and repair works. It is established that to prevent loss of load-bearing capacity of structures for long-term operation it is necessary to study the degradation and residual life of load-bearing capacity of structures, their reliability and durability, which were exposed to aggressive air, soil and water. It is established that the reason for the decrease in the strength of concrete beams, which were operated in an aggressive environment, was the error in the design of corrosion protection of structures. Reinforcement and injection filling of dry cracks, crevices and hidden cavities and stratifications and other corrosion damage of beams and slabs with the use of fluid polyurethane compositions, which allowed to extend the service life of structures. It is established that the use of the Polymer Cement Concrete system with the use of glued composite materials ensured the further normal operation of the monolithic reinforced concrete floor of the technical floor of the residential building. Recommendations for the sequence of operations in the repair of reinforced concrete structures of buildings and structures of long-term operation.","PeriodicalId":273453,"journal":{"name":"Bulletin of Odessa State Academy of Civil Engineering and Architecture","volume":"107 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124126816","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":"METHODOLOGY AND RESULTS OF THE SERIES P-2 GLASS SLABS DURABILITY TEST","authors":"Vasylyna Hula, B. Demchyna","doi":"10.31650/2415-377x-2022-86-15-23","DOIUrl":"https://doi.org/10.31650/2415-377x-2022-86-15-23","url":null,"abstract":"The paper presents the results of studies of glass plates of series P-2 for durability, which were made of float glass sheets, the methodology of experimental studies of glass plates for durability, as well as the design of the test facility. The analysis of literature sources on the subject made it possible to study the main factors of application of glass slabs as load-bearing structures. Glass is characterized by high strength, but glass structures are not widely used because of the possibility of their sudden brittle fracture and the lack of reliable calculation methods. The strength and reliability of glass structures depend on the type and strength of glass, manufacturing technology, the magnitude of external load and the duration of its action. Glass structures are characterized by the phenomenon of rheology and sudden brittle fracture, so the study of their durability, at different levels of external static load will ensure their reliable operation for the required time. Durability of a structure is the time from the beginning of static load action, which does not exceed the destructive load, with its further endurance until the destruction of the structure. For experimental studies of the durability of glass slabs, there was a need to create a research technique to ensure the stability of the external static load during the entire experiment with the possibility to record the growth of the deflection of the glass slab, the time and the nature of the failure up to the very moment of their sudden brittle failure. The paper describes the methodology and presents the initial results of the experimental study of glass beam slabs for durability. The slabs were hinged to two supports and operated as a single-span beam under a steady static load. Based on the experimental data obtained on the fracture of glass slabs during the action of a steady static load, we can try to predict their durability.","PeriodicalId":273453,"journal":{"name":"Bulletin of Odessa State Academy of Civil Engineering and Architecture","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131902049","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}