Pub Date : 2023-05-15DOI: 10.36622/vstu.2023.2.58.008
Yu. I. Kalgin, A. Alshahwan, N.I. Panevin
Statement of the problem. The problem of improving the structural and mechanical properties of hot and warm mix asphalt concrete based on mineral materials, produced by Ltd. «PavlovskNerud», Voronezh region, is considered, using the method of polymer-dispersed reinforcement. The effect of the modifier RTEP-M on the resistance of rutting for hot and warm mix asphalt concrete has been studied. Results. By studying hot and warm mixes asphalt with RTEP-M modifier in the amount of 0.3 and 0.6 % by weight in the mineral part, respectively, and the control composition, a significant improvement in structural and mechanical properties was achieved. It is shown that it is possible to increase the resistance of rutting for hot and warm asphalt concrete prepared on local road construction materials by increasing its viscous-elastic properties by using the method of dispersed reinforcement using the Russian additive RTEP-M. Conclusions. The efficiency of using the method of polymer-dispersed reinforcement to improve the structural and mechanical properties of hot and warm asphalt concrete based on local mineral materials has been proven. It is shown that the addition of the RTEP-M modifier to the mineral part of hot and warm asphalt concrete mix in the amount of 0.3 and 0.6 % by weight, respectively, improves the rutting resistance of the road surface. It has been proved that by applying the method of polymer-dispersed reinforcement, it is possible to optimize the properties of warm asphalt concrete for its use in hot climatic conditions for the introduction of warm technologies instead of hot ones in the construction and repair of road surfaces.
{"title":"Structural and Mechanical Properties of Modified Hot and Warm Mix Asphalt Concrete","authors":"Yu. I. Kalgin, A. Alshahwan, N.I. Panevin","doi":"10.36622/vstu.2023.2.58.008","DOIUrl":"https://doi.org/10.36622/vstu.2023.2.58.008","url":null,"abstract":"Statement of the problem. The problem of improving the structural and mechanical properties of hot and warm mix asphalt concrete based on mineral materials, produced by Ltd. «PavlovskNerud», Voronezh region, is considered, using the method of polymer-dispersed reinforcement. The effect of the modifier RTEP-M on the resistance of rutting for hot and warm mix asphalt concrete has been studied. Results. By studying hot and warm mixes asphalt with RTEP-M modifier in the amount of 0.3 and 0.6 % by weight in the mineral part, respectively, and the control composition, a significant improvement in structural and mechanical properties was achieved. It is shown that it is possible to increase the resistance of rutting for hot and warm asphalt concrete prepared on local road construction materials by increasing its viscous-elastic properties by using the method of dispersed reinforcement using the Russian additive RTEP-M. Conclusions. The efficiency of using the method of polymer-dispersed reinforcement to improve the structural and mechanical properties of hot and warm asphalt concrete based on local mineral materials has been proven. It is shown that the addition of the RTEP-M modifier to the mineral part of hot and warm asphalt concrete mix in the amount of 0.3 and 0.6 % by weight, respectively, improves the rutting resistance of the road surface. It has been proved that by applying the method of polymer-dispersed reinforcement, it is possible to optimize the properties of warm asphalt concrete for its use in hot climatic conditions for the introduction of warm technologies instead of hot ones in the construction and repair of road surfaces.","PeriodicalId":40951,"journal":{"name":"Russian Journal of Building Construction and Architecture","volume":"9 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88936566","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}
Pub Date : 2023-05-15DOI: 10.36622/vstu.2023.2.58.003
L. Kushchev, V. N. Melkumov, N. Savvin, V.V. Chuiko
Statement of the problem. The movement of the coolant in sections of tubular heating radiators of original designs containing various types of turbulators is considered. It is necessary to develop models of the movement of the coolant in the structures under consideration in the speed range of 0.5—1.5 m/s and compare the intensity of flow turbulence in them. Results. Using the Flow Simulation module of the SOLIDWORKS software package, the results of modeling the movement of a coolant in sections of original tubular heating radiators with turbulent inserts were obtained. 3D models of radiator sections were built. The dependences of the Re number on the coolant velocity and the distribution of turbulence intensity in the radiator sections are given. Conclusions. Based on the results of the simulation, the designs of the sections of the original tubular heating radiators were compared with the standard ones. A turbulent insert providing the highest Re number and turbulence intensity in the radiator section has been determined.
{"title":"Simulation of heat Carrier Motion in Tubular Heating Radiators","authors":"L. Kushchev, V. N. Melkumov, N. Savvin, V.V. Chuiko","doi":"10.36622/vstu.2023.2.58.003","DOIUrl":"https://doi.org/10.36622/vstu.2023.2.58.003","url":null,"abstract":"Statement of the problem. The movement of the coolant in sections of tubular heating radiators of original designs containing various types of turbulators is considered. It is necessary to develop models of the movement of the coolant in the structures under consideration in the speed range of 0.5—1.5 m/s and compare the intensity of flow turbulence in them. Results. Using the Flow Simulation module of the SOLIDWORKS software package, the results of modeling the movement of a coolant in sections of original tubular heating radiators with turbulent inserts were obtained. 3D models of radiator sections were built. The dependences of the Re number on the coolant velocity and the distribution of turbulence intensity in the radiator sections are given. Conclusions. Based on the results of the simulation, the designs of the sections of the original tubular heating radiators were compared with the standard ones. A turbulent insert providing the highest Re number and turbulence intensity in the radiator section has been determined.","PeriodicalId":40951,"journal":{"name":"Russian Journal of Building Construction and Architecture","volume":"2 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78789631","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}
Pub Date : 2023-05-15DOI: 10.36622/vstu.2023.2.58.005
M. Sharma, M. Ansari, N. Islam
Statement of the problem. This article aims to examine the behavior of UPVC bounded columns reinforced with polypropylene fibers under axial compression. Results. To develop this model, a number of samples of concrete filled UPVC pipe (CFUT) with different geometric properties were tested. To obtain the specimens, different material volume levels were used to investigate the sensitivity of these columns to various parameters. 3, 4 and 5 class pipes with 160-, 200- and 225-mm diameters and 800 mm length with 0.6, 0.8 and 1.0 MPa nominal/working pressure were taken and M30 and M40 grades of concrete were to fill the tubes. The effect of each variable on the ultimate strength, ductility and confinement efficiency of the samples was investigated. All the specimens were compressed by applying load only to the concrete core to obtain the load-displacement variations and the corresponding deformation mode. All the specimens failed with the development of shear cracks and slightly bulging macrocracks. Conclusions. A finite element model was developed using the proposed stress-strain variation of confined concrete with UPVC tubes to simulate axial compression of CFUT specimens. According to the results obtained, the effect of the change in the diameter-thickness ratio failure stress of concrete limited by (D/t) is obtained and discussed with an empirical relationship. Polypropylene fibers were found to slightly increase the column strength up to a certain volume fraction, after which the strength generally expe-rienced a decrease.
{"title":"Study of Concrete Filled UPVC Tubes as Column under Axial Loading","authors":"M. Sharma, M. Ansari, N. Islam","doi":"10.36622/vstu.2023.2.58.005","DOIUrl":"https://doi.org/10.36622/vstu.2023.2.58.005","url":null,"abstract":"Statement of the problem. This article aims to examine the behavior of UPVC bounded columns reinforced with polypropylene fibers under axial compression. Results. To develop this model, a number of samples of concrete filled UPVC pipe (CFUT) with different geometric properties were tested. To obtain the specimens, different material volume levels were used to investigate the sensitivity of these columns to various parameters. 3, 4 and 5 class pipes with 160-, 200- and 225-mm diameters and 800 mm length with 0.6, 0.8 and 1.0 MPa nominal/working pressure were taken and M30 and M40 grades of concrete were to fill the tubes. The effect of each variable on the ultimate strength, ductility and confinement efficiency of the samples was investigated. All the specimens were compressed by applying load only to the concrete core to obtain the load-displacement variations and the corresponding deformation mode. All the specimens failed with the development of shear cracks and slightly bulging macrocracks. Conclusions. A finite element model was developed using the proposed stress-strain variation of confined concrete with UPVC tubes to simulate axial compression of CFUT specimens. According to the results obtained, the effect of the change in the diameter-thickness ratio failure stress of concrete limited by (D/t) is obtained and discussed with an empirical relationship. Polypropylene fibers were found to slightly increase the column strength up to a certain volume fraction, after which the strength generally expe-rienced a decrease.","PeriodicalId":40951,"journal":{"name":"Russian Journal of Building Construction and Architecture","volume":"42 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77646605","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}
Pub Date : 2023-05-15DOI: 10.36622/vstu.2023.2.58.004
T. I. Gorokhov, A. Erofeev, B. Bondarev, A. Korneeva
Statement of the problem. The selection of composite material optimal composition is a complex task that can be solved using the method of mathematical planning of an experiment. The development of a new composite finishing building material based on a gypsum binder filled with wood filings is conditioned by the need to find ways to solve the problem of reducing the cost of finishing materials while maintaining their environmental friendliness and other operational parameters. Results. The article carried out the mathematical planning of an experiment on the selection of the optimal composition of a new building finishing material based on a gypsum binder filled with wood filings. Response equations are obtained for the following characteristics of the material: gypsum binder consumption per unit volume, density, thermal conductivity coefficient, transverse bending strength and compression. Conclusions. Based on the analysis of the level of perception of the characteristics of the material (application of an expert assessment method), the experimentally obtained results of the regression assessment allow one to determine the composition of a new finishing material based on the perception of gypsum binder by wood filings.
{"title":"Implementation of the Mathematical Planning of an Experiment Method in Selecting Optimal Composite Material Based on Gypsum Binder Filled with Wood Filings","authors":"T. I. Gorokhov, A. Erofeev, B. Bondarev, A. Korneeva","doi":"10.36622/vstu.2023.2.58.004","DOIUrl":"https://doi.org/10.36622/vstu.2023.2.58.004","url":null,"abstract":"Statement of the problem. The selection of composite material optimal composition is a complex task that can be solved using the method of mathematical planning of an experiment. The development of a new composite finishing building material based on a gypsum binder filled with wood filings is conditioned by the need to find ways to solve the problem of reducing the cost of finishing materials while maintaining their environmental friendliness and other operational parameters. Results. The article carried out the mathematical planning of an experiment on the selection of the optimal composition of a new building finishing material based on a gypsum binder filled with wood filings. Response equations are obtained for the following characteristics of the material: gypsum binder consumption per unit volume, density, thermal conductivity coefficient, transverse bending strength and compression. Conclusions. Based on the analysis of the level of perception of the characteristics of the material (application of an expert assessment method), the experimentally obtained results of the regression assessment allow one to determine the composition of a new finishing material based on the perception of gypsum binder by wood filings.","PeriodicalId":40951,"journal":{"name":"Russian Journal of Building Construction and Architecture","volume":"90 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83540284","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}
Pub Date : 2023-05-15DOI: 10.36622/vstu.2023.2.58.001
S. Chuykin, A. Loboda
Statement of the problem. The purpose of the article is to verify the developed mathematical model of conformal mapping of air flows, which constructs air velocity fields during displacement ventilation of rooms of complex configuration with partitions. Results. An experimental setup has been developed to study the physical model of a room with partitions, which allows performing physical modeling of air flows. The comparison of analytical and experimental results of calculating the air velocity in randomly selected points of the studied area is carried out. Conclusions. The verification results show that the developed model, with a sufficiently high accuracy, allows one to determine the air flow velocity with a vortex-free flow and its insignificant disturbance. An increase in the speed and deviation of the flow trajectory from the level lines leads to an increase in the calculation error.
{"title":"Verification of the Mathematical Model for Calculating the Air Flow Velocity Fields for Displacing Ventilation of Rooms of Complex Configuration","authors":"S. Chuykin, A. Loboda","doi":"10.36622/vstu.2023.2.58.001","DOIUrl":"https://doi.org/10.36622/vstu.2023.2.58.001","url":null,"abstract":"Statement of the problem. The purpose of the article is to verify the developed mathematical model of conformal mapping of air flows, which constructs air velocity fields during displacement ventilation of rooms of complex configuration with partitions. Results. An experimental setup has been developed to study the physical model of a room with partitions, which allows performing physical modeling of air flows. The comparison of analytical and experimental results of calculating the air velocity in randomly selected points of the studied area is carried out. Conclusions. The verification results show that the developed model, with a sufficiently high accuracy, allows one to determine the air flow velocity with a vortex-free flow and its insignificant disturbance. An increase in the speed and deviation of the flow trajectory from the level lines leads to an increase in the calculation error.","PeriodicalId":40951,"journal":{"name":"Russian Journal of Building Construction and Architecture","volume":"16 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84643999","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}
Pub Date : 2023-05-15DOI: 10.36622/vstu.2023.2.58.002
A.S. Ryabenko, K.A. Sklyarov, O.A. Kutsigina
Statement of the problem. The study is devoted to determining the temperature in a homogeneous half-plane with a finite rectilinear crack approaching the boundary of the half-plane, provided that the magnitude of the heat flux through the boundary of the half-plane as well as the jumps in temperature and heat flux on the crack are known. Results. A mathematical model is set forth that describes the stationary distribution of heat in a homogeneous half-plane with a rectilinear crack approaching the boundary of the half-plane, for the case when the magnitude of the heat flux through the boundary of the half-plane and the jumps in temperature and heat flux on the crack are known. The mathematical correctness of the proposed model is proved; a technique for constructing a solution to the model, as well as a whole class of related problems, is shown; a formula for representing the solution of the model is obtained. Conclusions. The formula obtained in the article can be used to study the temperature distribution in a material with a crack, including in the vicinity of a crack, as well as to determine what effect the presence of a crack has on the heat distribution.
{"title":"Determination of the Temperature in a Homogeneous Half-Plane with an Inclined Rectilinear Crack Approaching the Boundary of the Half-Plane According to the Magnitude of the Heat Flux Through the Boundary of the Half-Plane and the Magnitude of the Temperature and Heat Flux Jumps on the Crack","authors":"A.S. Ryabenko, K.A. Sklyarov, O.A. Kutsigina","doi":"10.36622/vstu.2023.2.58.002","DOIUrl":"https://doi.org/10.36622/vstu.2023.2.58.002","url":null,"abstract":"Statement of the problem. The study is devoted to determining the temperature in a homogeneous half-plane with a finite rectilinear crack approaching the boundary of the half-plane, provided that the magnitude of the heat flux through the boundary of the half-plane as well as the jumps in temperature and heat flux on the crack are known. Results. A mathematical model is set forth that describes the stationary distribution of heat in a homogeneous half-plane with a rectilinear crack approaching the boundary of the half-plane, for the case when the magnitude of the heat flux through the boundary of the half-plane and the jumps in temperature and heat flux on the crack are known. The mathematical correctness of the proposed model is proved; a technique for constructing a solution to the model, as well as a whole class of related problems, is shown; a formula for representing the solution of the model is obtained. Conclusions. The formula obtained in the article can be used to study the temperature distribution in a material with a crack, including in the vicinity of a crack, as well as to determine what effect the presence of a crack has on the heat distribution.","PeriodicalId":40951,"journal":{"name":"Russian Journal of Building Construction and Architecture","volume":"10 5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134988854","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}
Pub Date : 2023-05-15DOI: 10.36622/vstu.2023.2.58.007
V. M. Flavianov, V. Volkov, V. A. Kozlov, O. Ryabova
Statement of the problem. A method for the construction of drainage pipes in road construction using the technology of arranging coiled pipes from polymer profiles with a metal core is considered. This technology has some unique properties and characteristics that make it possible to bring road construction to a new technological level. Results. In the course of the study, an analysis of the spiral-wound technology for the construction of pipes was performed, the three most common technologies for the device of spiral-wound pipelines were considered in detail. A comparative analysis of the effectiveness of spiral-wound technologies in terms of characteristics, labor costs and cost of work is provided. Conclusions. Spiral-wound technology is the most promising and optimal for road construction. The design features of the culverts built using this technology have no restrictions on the form factor, they allow one to arrange pipes of a wide range of diameters. The installation of ten meters of a coiled pipeline in a closed way is almost 3 times more efficient than that of a similar metal pipeline, requires 1.86 times less money, and is environmentally efficient. Adaptation of methods for calculating and designing pipelines to the features of spiral wound technologies will speed up and simplify the design and construction of culvert pipelines as part of the roadway.
{"title":"Brief Historical Review and Analysis of Spiral-Winding Technologies for the Installation of Culverts in Modern Construction","authors":"V. M. Flavianov, V. Volkov, V. A. Kozlov, O. Ryabova","doi":"10.36622/vstu.2023.2.58.007","DOIUrl":"https://doi.org/10.36622/vstu.2023.2.58.007","url":null,"abstract":"Statement of the problem. A method for the construction of drainage pipes in road construction using the technology of arranging coiled pipes from polymer profiles with a metal core is considered. This technology has some unique properties and characteristics that make it possible to bring road construction to a new technological level. Results. In the course of the study, an analysis of the spiral-wound technology for the construction of pipes was performed, the three most common technologies for the device of spiral-wound pipelines were considered in detail. A comparative analysis of the effectiveness of spiral-wound technologies in terms of characteristics, labor costs and cost of work is provided. Conclusions. Spiral-wound technology is the most promising and optimal for road construction. The design features of the culverts built using this technology have no restrictions on the form factor, they allow one to arrange pipes of a wide range of diameters. The installation of ten meters of a coiled pipeline in a closed way is almost 3 times more efficient than that of a similar metal pipeline, requires 1.86 times less money, and is environmentally efficient. Adaptation of methods for calculating and designing pipelines to the features of spiral wound technologies will speed up and simplify the design and construction of culvert pipelines as part of the roadway.","PeriodicalId":40951,"journal":{"name":"Russian Journal of Building Construction and Architecture","volume":"79 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84107508","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}
Pub Date : 2023-05-15DOI: 10.36622/vstu.2023.2.58.006
Dr.J. Eiraji
Statement of the problem. This paper is a part of research project by Islamic Azad University to check if energy consumption in its Hashtgerd Branch is optimized and if it is not what the solutions for a built educational project can be suggested. What will be studied in this paper, at first, is a review and basic studies of sustainability which will be the main solution of research problem at the end. Next, as educational buildings, as public spaces, have more energy consumption and have especial architectural details and conditions, we will study the current situation of architectural and energy consumption details of our selected and built case study to see positive and negative points. Results. The results of the research show that despite the positive points, many of the negative points have been detected that led to high energy consumption and as the project is built, availability of changes are harder. Conclusions. As this research is a qualitative research and in the other hand the project needs to adopt itself with the policies of the Ministry of Power and Energy of the country, qualitative solutions which are based on sustainability rules, will be checked and offered. The results show that by managing sustainabi-lity rules in a built project, the energy consumptions can be reduced and optimized.
{"title":"Sustainability and Optimizing Energy Consumption in Architecture of the Built Educational Spaces (Case Study: Hashtgerd Branch)","authors":"Dr.J. Eiraji","doi":"10.36622/vstu.2023.2.58.006","DOIUrl":"https://doi.org/10.36622/vstu.2023.2.58.006","url":null,"abstract":"Statement of the problem. This paper is a part of research project by Islamic Azad University to check if energy consumption in its Hashtgerd Branch is optimized and if it is not what the solutions for a built educational project can be suggested. What will be studied in this paper, at first, is a review and basic studies of sustainability which will be the main solution of research problem at the end. Next, as educational buildings, as public spaces, have more energy consumption and have especial architectural details and conditions, we will study the current situation of architectural and energy consumption details of our selected and built case study to see positive and negative points. Results. The results of the research show that despite the positive points, many of the negative points have been detected that led to high energy consumption and as the project is built, availability of changes are harder. Conclusions. As this research is a qualitative research and in the other hand the project needs to adopt itself with the policies of the Ministry of Power and Energy of the country, qualitative solutions which are based on sustainability rules, will be checked and offered. The results show that by managing sustainabi-lity rules in a built project, the energy consumptions can be reduced and optimized.","PeriodicalId":40951,"journal":{"name":"Russian Journal of Building Construction and Architecture","volume":"27 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73551919","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}
Pub Date : 2023-05-15DOI: 10.36622/vstu.2023.2.58.009
G. V. Denisov
Statement of the problem. Despite the introduction of engineering practice of numerical methods for the calculation, in a case of engineering problems associated with extended structures, the well-known models «rod on an elastic foundation» and «beam on an elastic foundation» are widely used to describe the behavior of structures. Most of the known solutions were obtained in the conditions of an idealized setting and without differences in the properties of the foundation. This work is devoted to the study of the dynamics of a rod of finite length with a point mass at the end and partially placement on a piecewise-homogeneous elastic foundation, formed by two sections of different stiffness. The aim of this study is to obtain analytical dependences for the first frequency of the longitudinal vibrations of a rod with different boundary conditions at its ends: rigid support and free end. The available research results are obtained for special cases, which makes them difficult to apply in practice. To assess the influence of the inertial pro-perties of the foundation, the case with different linear masses of the rod in the pinched and cantilever sections is considered. Results. Using the Ritz method analytical dependences were obtained for the determination of the first frequency of the longitudinal vibrations of a fix and free rod with a point mass at the end and partially placement on a piecewise-homogeneous elastic foundation formed by two sections of different stiffness. Quantitative evaluation shows good agreement with those of other studies. The results for particular cases are obtained. Conclusions. It is shown that the first natural frequency of longitudinal oscillations is in a certain range and in the nonlinear ratios depending on the lengths of the sections various elastic. The inertial properties of the foundation leads to a decrease in the first frequency.
{"title":"First Frequency of Longitudinal Vibration of a Rod with Mass at one End and Partial Placement on Piecewise-Homogeneous Elastic Foundation","authors":"G. V. Denisov","doi":"10.36622/vstu.2023.2.58.009","DOIUrl":"https://doi.org/10.36622/vstu.2023.2.58.009","url":null,"abstract":"Statement of the problem. Despite the introduction of engineering practice of numerical methods for the calculation, in a case of engineering problems associated with extended structures, the well-known models «rod on an elastic foundation» and «beam on an elastic foundation» are widely used to describe the behavior of structures. Most of the known solutions were obtained in the conditions of an idealized setting and without differences in the properties of the foundation. This work is devoted to the study of the dynamics of a rod of finite length with a point mass at the end and partially placement on a piecewise-homogeneous elastic foundation, formed by two sections of different stiffness. The aim of this study is to obtain analytical dependences for the first frequency of the longitudinal vibrations of a rod with different boundary conditions at its ends: rigid support and free end. The available research results are obtained for special cases, which makes them difficult to apply in practice. To assess the influence of the inertial pro-perties of the foundation, the case with different linear masses of the rod in the pinched and cantilever sections is considered. Results. Using the Ritz method analytical dependences were obtained for the determination of the first frequency of the longitudinal vibrations of a fix and free rod with a point mass at the end and partially placement on a piecewise-homogeneous elastic foundation formed by two sections of different stiffness. Quantitative evaluation shows good agreement with those of other studies. The results for particular cases are obtained. Conclusions. It is shown that the first natural frequency of longitudinal oscillations is in a certain range and in the nonlinear ratios depending on the lengths of the sections various elastic. The inertial properties of the foundation leads to a decrease in the first frequency.","PeriodicalId":40951,"journal":{"name":"Russian Journal of Building Construction and Architecture","volume":"36 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79136590","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}
Pub Date : 2023-03-24DOI: 10.29039/2308-0191-2022-11-1-7-7
Alena Pavlyuk
The globalization of the modern world imposes new requirements on the academic mobility of teachers. Academic mobility provides unlimited opportunities for professional and personal growth, access to various educational systems and environments. It contributes to improving the quality of education, its internationalization, and the development of international research cooperation. However, along with the positive aspects, there are many limitations. In particular, the issue of organizing the accommodation of teachers is especially relevant. The article will consider the main aspects that affect the organization of teachers' accommodation and current trends.
{"title":"Academic mobility of university employees. prerequisites for the transition to a new type of housing","authors":"Alena Pavlyuk","doi":"10.29039/2308-0191-2022-11-1-7-7","DOIUrl":"https://doi.org/10.29039/2308-0191-2022-11-1-7-7","url":null,"abstract":"The globalization of the modern world imposes new requirements on the academic mobility of teachers. Academic mobility provides unlimited opportunities for professional and personal growth, access to various educational systems and environments. It contributes to improving the quality of education, its internationalization, and the development of international research cooperation. \u0000However, along with the positive aspects, there are many limitations. In particular, the issue of organizing the accommodation of teachers is especially relevant. The article will consider the main aspects that affect the organization of teachers' accommodation and current trends.","PeriodicalId":40951,"journal":{"name":"Russian Journal of Building Construction and Architecture","volume":"298 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77777689","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}
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