Pub Date : 2023-03-29DOI: 10.22337/2587-9618-2023-19-1-178-189
Sergey G. Fedosin, A. Kuzenkov, Sergey Moiseev, I. Maksimova, I. Erofeeva, Ya.A. Sanyagina
In the construction industry, cement concretes are the most widely used building material. New generation materials with increased strength and durability are used in the construction of critical facilities. Special requirements are imposed on such concretes to ensure their quality. The issues of control and quality of powder-activated concretes of a new generation at the stage of preparation of their constituent components are considered. Author made in the article the analysis of the classifier data for the developed system of quality control (QC) based on Shewhart control charts. For implement an effective classification of critical situations we justified target-conformity application of support vector. We accumulated the base of possible solutions in special cases when process of cement production go out from control limits. For pro-programmatic implementation of support vector we used library application LIBSVM. We described procedures for the preparation of the accumulated data for training models of SVM. We determined optimal parameters of created models nuclei to ensure accurate classification. We created SVM models for all monitored parameters. We created HMI display effective solutions to prevent critical situations for the operator.
{"title":"QUALITY CONTROL OF DISPERSED COMPONENTS POWDER-ACTIVATED CONCRETE WITH THE HELP OF SHUKHART'S CARDS","authors":"Sergey G. Fedosin, A. Kuzenkov, Sergey Moiseev, I. Maksimova, I. Erofeeva, Ya.A. Sanyagina","doi":"10.22337/2587-9618-2023-19-1-178-189","DOIUrl":"https://doi.org/10.22337/2587-9618-2023-19-1-178-189","url":null,"abstract":"In the construction industry, cement concretes are the most widely used building material. New generation materials with increased strength and durability are used in the construction of critical facilities. Special requirements are imposed on such concretes to ensure their quality. The issues of control and quality of powder-activated concretes of a new generation at the stage of preparation of their constituent components are considered. Author made in the article the analysis of the classifier data for the developed system of quality control (QC) based on Shewhart control charts. For implement an effective classification of critical situations we justified target-conformity application of support vector. We accumulated the base of possible solutions in special cases when process of cement production go out from control limits. For pro-programmatic implementation of support vector we used library application LIBSVM. We described procedures for the preparation of the accumulated data for training models of SVM. We determined optimal parameters of created models nuclei to ensure accurate classification. We created SVM models for all monitored parameters. We created HMI display effective solutions to prevent critical situations for the operator.","PeriodicalId":36116,"journal":{"name":"International Journal for Computational Civil and Structural Engineering","volume":"40 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89008680","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 : 2023-03-29DOI: 10.22337/2587-9618-2023-19-1-69-84
The article defines the main results for the development of reinforced concrete mechanics. In the isotropic medium between the cracks is used "first object - flows-blocks", "second object - main cracks" and the effect of reinforced concrete, the physical essence of which is the non-uniformity of concrete and continuous reinforcement. Reactions arise in the concrete for deformation of the reinforcement from the bonding of the compressed concrete in the tensile region. The average resistance of the tensile concrete and the "average total force of the working reinforcement," the third object, are transmitted through the effect of reinforced concrete and the "dowel" effect. The crack opening widths are the relative mutual displacements of reinforcement and concrete, determined from the boundary conditions and the Thomas-Author hypothesis. A new classification of cracks has been developed: regular cracks (anisotropic medium of reinforced concrete) and main cracks based on the effect of reinforced concrete (origins - concentrations) and maximum opening in the closed equations of mechanics of reinforced concrete from the Lagrange function. The author has proposed hypotheses, theorems of linear and angular deformations, functionals for deplanation of cross section of reinforced concrete element from elastic-plastic stage, jumps - cracks and stiffness matrix in a single compound strip which allow to reduce the order of differential equations. The resistance design model method for reinforced concrete mechanics is used for the rod, wall, and slab of the "envelope" of cracks. Hybrid from Lira (finite element method of reinforced concrete from anisotropy) developed in the form of two finite element effect of reinforced concrete of "flat and spatial cantilever" for external and internal displacements. The general principle from Loleith to the "opening - closing" of cracks, the stiffness of the mechanics of reinforced concrete is obtained in the form of the method of the computational model of resistance.
{"title":"THE PROBLEM OF CRACK OPENING WIDTH AND STIFFNESS OF REINFORCED CONCRETE STRUCTURES, BUILDINGS AND CONSTRUCTIONS","authors":"","doi":"10.22337/2587-9618-2023-19-1-69-84","DOIUrl":"https://doi.org/10.22337/2587-9618-2023-19-1-69-84","url":null,"abstract":"The article defines the main results for the development of reinforced concrete mechanics. In the isotropic medium between the cracks is used \"first object - flows-blocks\", \"second object - main cracks\" and the effect of reinforced concrete, the physical essence of which is the non-uniformity of concrete and continuous reinforcement. Reactions arise in the concrete for deformation of the reinforcement from the bonding of the compressed concrete in the tensile region. The average resistance of the tensile concrete and the \"average total force of the working reinforcement,\" the third object, are transmitted through the effect of reinforced concrete and the \"dowel\" effect. The crack opening widths are the relative mutual displacements of reinforcement and concrete, determined from the boundary conditions and the Thomas-Author hypothesis. A new classification of cracks has been developed: regular cracks (anisotropic medium of reinforced concrete) and main cracks based on the effect of reinforced concrete (origins - concentrations) and maximum opening in the closed equations of mechanics of reinforced concrete from the Lagrange function. The author has proposed hypotheses, theorems of linear and angular deformations, functionals for deplanation of cross section of reinforced concrete element from elastic-plastic stage, jumps - cracks and stiffness matrix in a single compound strip which allow to reduce the order of differential equations. The resistance design model method for reinforced concrete mechanics is used for the rod, wall, and slab of the \"envelope\" of cracks. Hybrid from Lira (finite element method of reinforced concrete from anisotropy) developed in the form of two finite element effect of reinforced concrete of \"flat and spatial cantilever\" for external and internal displacements. The general principle from Loleith to the \"opening - closing\" of cracks, the stiffness of the mechanics of reinforced concrete is obtained in the form of the method of the computational model of resistance.","PeriodicalId":36116,"journal":{"name":"International Journal for Computational Civil and Structural Engineering","volume":"7 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90345334","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 : 2022-12-28DOI: 10.22337/2587-9618-2022-18-4-101-110
A. Rozhkov, V. Galishnikova
It is obvious that the interoperability of existing digital models is insufficient. Current research on model view definitions and on their semantic enrichment addresses the issue of good interpretation of the results of existing models to improve interoperability. The alternative research presented in this paper is not concerned with interpretation. Instead, the influence of modifications in the geometric and topological concepts of the digital models themselves on their interoperability is investigated. The geometric and topological attributes of the models are made as explicit as possible. Two-dimensional line drawings are replaced by three-dimensional linear complexes to reduce the need for implicit information. The topology of a complex is described with topological tables containing all elements of the model, thus replacing the geometric neighborhood concept of the industry foundation classes. A highly efficient algorithm for the construction of new topological tables of large buildings is presented. The difficulties encountered in modifying existing topological tables are analyzed and solved. Topological and geometric aspects of linear complexes that cannot be treated explicitly with topological tables are identified and presented.
{"title":"EXPLICIT DIGITAL MODELS OF LINEAR COMPLEXES","authors":"A. Rozhkov, V. Galishnikova","doi":"10.22337/2587-9618-2022-18-4-101-110","DOIUrl":"https://doi.org/10.22337/2587-9618-2022-18-4-101-110","url":null,"abstract":"It is obvious that the interoperability of existing digital models is insufficient. Current research on model view definitions and on their semantic enrichment addresses the issue of good interpretation of the results of existing models to improve interoperability. The alternative research presented in this paper is not concerned with interpretation. Instead, the influence of modifications in the geometric and topological concepts of the digital models themselves on their interoperability is investigated. The geometric and topological attributes of the models are made as explicit as possible. Two-dimensional line drawings are replaced by three-dimensional linear complexes to reduce the need for implicit information. The topology of a complex is described with topological tables containing all elements of the model, thus replacing the geometric neighborhood concept of the industry foundation classes. A highly efficient algorithm for the construction of new topological tables of large buildings is presented. The difficulties encountered in modifying existing topological tables are analyzed and solved. Topological and geometric aspects of linear complexes that cannot be treated explicitly with topological tables are identified and presented.","PeriodicalId":36116,"journal":{"name":"International Journal for Computational Civil and Structural Engineering","volume":"153 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73044331","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 : 2022-12-28DOI: 10.22337/2587-9618-2022-18-4-132-137
V. Travush, V. Murashkin
During the reconstruction, or upon expiration of the service life, as well as after external impact, reinforced concrete structures require examination and verification calculations. Existing diagrams of concrete deformation are focused on designing new structures and are not adapted to the concretes of the reconstructed structures. Using the world experience in describing alloy deformation, the concrete deformation model based on using the Arrhenius equation is proposed in this article. A technique for creating an individual deformations model during the reconstruction is demonstrated on a specific example. The physical meaning of the coefficients used in the proposed model is illustrated. Examples confirming the adequacy of the proposed concrete deformations model during the reconstruction are given.
{"title":"CONCRETE DEFORMATION MODEL FOR RECONSTRUCTED REINFORCED CONCRETE","authors":"V. Travush, V. Murashkin","doi":"10.22337/2587-9618-2022-18-4-132-137","DOIUrl":"https://doi.org/10.22337/2587-9618-2022-18-4-132-137","url":null,"abstract":"During the reconstruction, or upon expiration of the service life, as well as after external impact, reinforced concrete structures require examination and verification calculations. Existing diagrams of concrete deformation are focused on designing new structures and are not adapted to the concretes of the reconstructed structures. Using the world experience in describing alloy deformation, the concrete deformation model based on using the Arrhenius equation is proposed in this article. A technique for creating an individual deformations model during the reconstruction is demonstrated on a specific example. The physical meaning of the coefficients used in the proposed model is illustrated. Examples confirming the adequacy of the proposed concrete deformations model during the reconstruction are given.","PeriodicalId":36116,"journal":{"name":"International Journal for Computational Civil and Structural Engineering","volume":"23 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83202382","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 : 2022-12-28DOI: 10.22337/2587-9618-2022-18-4-138-150
N. Aniskin, Aleksey Shaytanov, Mikhail Shaytanov
In this paper, we consider the issue of assessing the degree of influence of the selected factors on the temperature regime and the thermally stressed state of a concrete gravity dam being built from low-cement concrete for several possible construction scenarios. The studies were carried out in relation to the design and conditions of the construction area of the Pskem hydroelectric complex in the Republic of Uzbekistan. Variation factors were: cement consumption in the mixture, the initial temperature of the concrete mixture, the heat release of cement, the thickness of the laid concrete layer, the month of commencement of work. The environmental factors were the variable ambient temperature during the year by months and the influence of solar radiation. The calculations were carried out taking into account the seasonality of the moment the construction of the structure began. 2 options were considered: autumn-winter with concreting of the zone at the base of the dam from September to February inclusive; spring-summer with concreting of this zone from March to August inclusive. In addition, options were considered taking into account additional heating from exposure to solar radiation and without it. The studies were carried out using the methodology of experiment planning in the search for optimal solutions (method of factor analysis). The numerical experiment was carried out on the basis of the finite element method using the ANSYS software package. Using the method of factor analysis, the influence of the main acting factors on the temperature regime of a gravity dam made of rolled concrete was studied. A variant of a combination of factors is proposed to obtain the most favorable temperature regime. Regression equations are obtained for predicting the temperature regime of concrete gravity dams being built from low-cement content concrete. The results of studies using the factor analysis technique can be used in the design of concrete dams from rolled concrete.
{"title":"ANALYSIS OF THE DEGREE OF INFLUENCE OF INTERNAL AND EXTERNAL FACTORS ON THE TEMPERATURE REGIME OF A LOW-CEMENT CONCRETE DAM","authors":"N. Aniskin, Aleksey Shaytanov, Mikhail Shaytanov","doi":"10.22337/2587-9618-2022-18-4-138-150","DOIUrl":"https://doi.org/10.22337/2587-9618-2022-18-4-138-150","url":null,"abstract":"In this paper, we consider the issue of assessing the degree of influence of the selected factors on the temperature regime and the thermally stressed state of a concrete gravity dam being built from low-cement concrete for several possible construction scenarios. The studies were carried out in relation to the design and conditions of the construction area of the Pskem hydroelectric complex in the Republic of Uzbekistan. Variation factors were: cement consumption in the mixture, the initial temperature of the concrete mixture, the heat release of cement, the thickness of the laid concrete layer, the month of commencement of work. The environmental factors were the variable ambient temperature during the year by months and the influence of solar radiation. The calculations were carried out taking into account the seasonality of the moment the construction of the structure began. 2 options were considered: autumn-winter with concreting of the zone at the base of the dam from September to February inclusive; spring-summer with concreting of this zone from March to August inclusive. In addition, options were considered taking into account additional heating from exposure to solar radiation and without it. The studies were carried out using the methodology of experiment planning in the search for optimal solutions (method of factor analysis). The numerical experiment was carried out on the basis of the finite element method using the ANSYS software package. Using the method of factor analysis, the influence of the main acting factors on the temperature regime of a gravity dam made of rolled concrete was studied. A variant of a combination of factors is proposed to obtain the most favorable temperature regime. Regression equations are obtained for predicting the temperature regime of concrete gravity dams being built from low-cement content concrete. The results of studies using the factor analysis technique can be used in the design of concrete dams from rolled concrete.","PeriodicalId":36116,"journal":{"name":"International Journal for Computational Civil and Structural Engineering","volume":"30 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88095599","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 : 2022-12-28DOI: 10.22337/2587-9618-2022-18-4-111-123
S. Savin, N. Fedorova, V. Kolchunov
Interest to solving scientific problems related to the evaluation of facilities' resistance and its protection against progressive collapse increases and attracts more and more attention of specialists in the field of structural analysis and design. Therefore, the article presents the results of a computational analysis of dynamic forces in eccentrically compressed reinforced concrete members of structures under accidental impact such as sudden removal of a load bearing member. Using relations for specific deformation energy and integrating it through the cross-section area, the analytical expressions for dynamic strains and curvatures have been obtained for physically and structurally nonlinear RC frame members under eccentric compression. These expressions in some cases allow symbolic solution, for example, in MathCAD software. In contrary, it can be solved with the approximate iterative method. To assess the reliability and effectiveness of the proposed quasi-static method, the analysis of the cast-in-situ reinforced concrete frame resistance to progressive collapse has been performed. The article also provides comparison of the simulation results of the nonlinear quasi-static analysis and the nonlinear dynamic time-history analysis.
{"title":"DINAMIC FORCES IN THE ECCENTRICALLY COMPRESSED MEMBERS OF REINFORCED CONCRETE FRAMES UNDER ACCIDENTAL IMPACTS","authors":"S. Savin, N. Fedorova, V. Kolchunov","doi":"10.22337/2587-9618-2022-18-4-111-123","DOIUrl":"https://doi.org/10.22337/2587-9618-2022-18-4-111-123","url":null,"abstract":"Interest to solving scientific problems related to the evaluation of facilities' resistance and its protection against progressive collapse increases and attracts more and more attention of specialists in the field of structural analysis and design. Therefore, the article presents the results of a computational analysis of dynamic forces in eccentrically compressed reinforced concrete members of structures under accidental impact such as sudden removal of a load bearing member. Using relations for specific deformation energy and integrating it through the cross-section area, the analytical expressions for dynamic strains and curvatures have been obtained for physically and structurally nonlinear RC frame members under eccentric compression. These expressions in some cases allow symbolic solution, for example, in MathCAD software. In contrary, it can be solved with the approximate iterative method. To assess the reliability and effectiveness of the proposed quasi-static method, the analysis of the cast-in-situ reinforced concrete frame resistance to progressive collapse has been performed. The article also provides comparison of the simulation results of the nonlinear quasi-static analysis and the nonlinear dynamic time-history analysis.","PeriodicalId":36116,"journal":{"name":"International Journal for Computational Civil and Structural Engineering","volume":"59 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84788596","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 : 2022-12-28DOI: 10.22337/2587-9618-2022-18-4-49-61
V. Erofeev, N. Vatin, I. Maksimova, O. Tarakanov, Ya.A. Sanyagina, I. Erofeeva, O. Suzdaltsev
In recent years, self-compacting concrete mixtures have been widely used. Such mixtures are characterized by high workability without the use of vibration exposure. The application of innovative technologies allows manufactoring of various materials and products for architectural and construction purposes with improved decorative properties. The paper provides the results of a study on the selection of compositions for decorative-finishing powder-activated concrete with a granular surface texture according to rheological properties, strength and frost resistance had been adopted. The following components were adopted for the research. Egyptian white cement was used as a binder, microquartz as a microfiller, screenings of crushing granite and cooper slag of 0–0.63 mm fraction was used as a finely dispersed component, granite cuts 0.63–5.0 mm and cooper slag of 0.63–2.5 mm fraction as an aggregate sand. A new generation superplasticizer of domestic and foreign productionplasticized the mixtures. Structural and rheotechnological parameters of powder-activated concretes were calculated. From the obtained values of the conditional rheological criteria of powder-activated concretes, it follows that all of them are much greater than unity and characterize a significant excess of the volumes of rheological matrices over the volumes of fine-grained, coarse-grained components that fit into them with large separation of particles and grains. Strength as a complex mechanical characteristic, including a combination of strength, reliability and durability criteria, is the most important quality parameter of the concrete structure as an active and the most massive building material for structural purposes. A significant number of facilities made of concrete and reinforced concrete are being built in the southern and northern regions, characterized by extreme climatic conditions. Buildings and structures are exposed to cyclic loadings of various types and climatic influences, characterized by cyclic manifestations of negative and alternating temperatures. The research revealed high indicators of strength and frost resistance of decorative powder-activated concretes with a granular surface texture.
近年来，自密实混凝土混合料得到了广泛的应用。这种混合物的特点是高和易性，无需使用振动暴露。创新技术的应用使建筑和建筑用途的各种材料和产品的制造具有改进的装饰性能。本文根据流变性、强度、抗冻性等指标，对颗粒状表面结构装饰饰面粉活化混凝土的成分选择进行了研究。本研究采用了以下组成部分:以埃及白水泥为粘结剂，微石英为微填料，破碎花岗岩筛分和0-0.63 mm分数的铜渣为细分散组分，花岗岩切割0.63-5.0 mm, 0.63-2.5 mm分数的铜渣为集料砂。国内外新一代高效减水剂对混合物进行了塑化。计算了粉末活化混凝土的结构参数和流变工艺参数。从获得的粉末活化混凝土的条件流变标准值来看，它们都比统一大得多，并且表现出流变基质的体积明显超过细粒度、粗粒度组分的体积，细粒度组分与颗粒和颗粒的大分离相适应。强度作为一种复杂的力学特性，包括强度、可靠性和耐久性标准的组合，是混凝土结构最重要的质量参数，是用于结构目的的最活跃和最庞大的建筑材料。在气候条件极端的南部和北部地区，正在建造大量由混凝土和钢筋混凝土制成的设施。建筑物和结构暴露于各种类型的循环载荷和气候影响下，其特征是负温度和交替温度的循环表现。研究表明，具有颗粒状表面纹理的装饰性粉末活化混凝土具有较高的强度和抗冻性指标。
{"title":"POWDER-ACTIVATED CONCRETE WITH A GRANULAR SUR-FACE TEXTURE","authors":"V. Erofeev, N. Vatin, I. Maksimova, O. Tarakanov, Ya.A. Sanyagina, I. Erofeeva, O. Suzdaltsev","doi":"10.22337/2587-9618-2022-18-4-49-61","DOIUrl":"https://doi.org/10.22337/2587-9618-2022-18-4-49-61","url":null,"abstract":"In recent years, self-compacting concrete mixtures have been widely used. Such mixtures are characterized by high workability without the use of vibration exposure. The application of innovative technologies allows manufactoring of various materials and products for architectural and construction purposes with improved decorative properties. The paper provides the results of a study on the selection of compositions for decorative-finishing powder-activated concrete with a granular surface texture according to rheological properties, strength and frost resistance had been adopted. \u0000The following components were adopted for the research. Egyptian white cement was used as a binder, microquartz as a microfiller, screenings of crushing granite and cooper slag of 0–0.63 mm fraction was used as a finely dispersed component, granite cuts 0.63–5.0 mm and cooper slag of 0.63–2.5 mm fraction as an aggregate sand. A new generation superplasticizer of domestic and foreign productionplasticized the mixtures. Structural and rheotechnological parameters of powder-activated concretes were calculated. \u0000From the obtained values of the conditional rheological criteria of powder-activated concretes, it follows that all of them are much greater than unity and characterize a significant excess of the volumes of rheological matrices over the volumes of fine-grained, coarse-grained components that fit into them with large separation of particles and grains. \u0000Strength as a complex mechanical characteristic, including a combination of strength, reliability and durability criteria, is the most important quality parameter of the concrete structure as an active and the most massive building material for structural purposes. A significant number of facilities made of concrete and reinforced concrete are being built in the southern and northern regions, characterized by extreme climatic conditions. Buildings and structures are exposed to cyclic loadings of various types and climatic influences, characterized by cyclic manifestations of negative and alternating temperatures. The research revealed high indicators of strength and frost resistance of decorative powder-activated concretes with a granular surface texture.","PeriodicalId":36116,"journal":{"name":"International Journal for Computational Civil and Structural Engineering","volume":"43 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85480440","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 : 2022-12-28DOI: 10.22337/2587-9618-2022-18-4-82-90
M. Hosseini, P. Beiranvand, M. Mohammadiasl, Ashkan Hasanvand
The slope stability is a major concern to geotechnical engineers. Traditional methods of slope stability analysis have potentially ignored the influence of surface cracks. It is also known that seasonal rainfall and seepage through crack are closely related with slope failure. First, surface cracks provide special flow channels which increase the soil permeability and decrease the soil strength. Second, water-filled cracks apply an additional active force on the slope. Finally, cracks can create a part of the critical failure surface that has no shear strength. The objective of this paper is to investigate the influence of existing cracks on the stability of a cracked soil slope in different state. The effects of crack depth, slope angle and water-filled cracks on the stability of the cracked slope are explored. The analysis was conducted using the computer modelling programs Optum G2 to analysis of slope factor of safety. The results show that with increasing of slope angle the factor of safety decreases and this problem is significant in the slope with water filled cracks. Also, Factor of safety for all of slope angles in Dry and water filled cracks states with increasing the crack depth, decrease significantly.
{"title":"INFLUENCE OF SURFACE CRACKS ON THE STABILITY OF CRACKED SOIL SLOPE","authors":"M. Hosseini, P. Beiranvand, M. Mohammadiasl, Ashkan Hasanvand","doi":"10.22337/2587-9618-2022-18-4-82-90","DOIUrl":"https://doi.org/10.22337/2587-9618-2022-18-4-82-90","url":null,"abstract":"The slope stability is a major concern to geotechnical engineers. Traditional methods of slope stability analysis have potentially ignored the influence of surface cracks. It is also known that seasonal rainfall and seepage through crack are closely related with slope failure. First, surface cracks provide special flow channels which increase the soil permeability and decrease the soil strength. Second, water-filled cracks apply an additional active force on the slope. Finally, cracks can create a part of the critical failure surface that has no shear strength. The objective of this paper is to investigate the influence of existing cracks on the stability of a cracked soil slope in different state. The effects of crack depth, slope angle and water-filled cracks on the stability of the cracked slope are explored. The analysis was conducted using the computer modelling programs Optum G2 to analysis of slope factor of safety. The results show that with increasing of slope angle the factor of safety decreases and this problem is significant in the slope with water filled cracks. Also, Factor of safety for all of slope angles in Dry and water filled cracks states with increasing the crack depth, decrease significantly.","PeriodicalId":36116,"journal":{"name":"International Journal for Computational Civil and Structural Engineering","volume":"14 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83811049","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 : 2022-12-28DOI: 10.22337/2587-9618-2022-18-4-23-38
Nikita Britikov
This paper presents the methodologies for numerical modelling of snow deposits and snow transport on long-span roofs for steady and unsteady flow. The calculation of snow loads on long-span roofs is a complex problem, solving which often involves deviating from the building code recommendations. Experiments in wind tunnels, although widely used, do not allow reproducing the full-scale effects of all snow accumulation processes. At the same time, the continuous improvement of mathematical models, numerical methods, software and computer technologies makes the development and implementation of numerical modelling technologies in real construction practice and regulatory documents inevitable. In this paper it is shown that the use of the well-known erosion-deposition model, supported by field observations and experimental data, allows reproducing reasonably accurate snow distributions on long-span roofs. The importance of the “synthesis” between physical and mathematical modelling and the application of the building codes is emphasized, as only the joint use of approaches can comprehensively describe modelling of snow accumulation and snow transport and provide better solutions to a wider range of related problems.
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Pub Date : 2022-12-28DOI: 10.22337/2587-9618-2022-18-4-91-100
Владимир Орлов, Сергей Зоткин, Дмитрий Петербургский
Предложены подходы к оценке прочностных характеристик двухслойных трубопроводов, образующихся в результате использования бестраншейной технологии реконструкции ветхих стальных трубопроводных сетей путем протаскивания в них труб из непластифицированного поливинилхлорида (НПВХ). Представлены результаты моделирования процесса забутовки межтрубного пространства между стальной и полимерной трубами с анализом трех состояний двухтрубной системы на предмет обеспечения прочностных характеристик. Выполнены расчета и представлен анализ возможности экономии электроэнергии при использовании труб из НПВХ в двухслойной трубной конструкции при различных температурах транспортируемой воды и стабильной температуре стенки трубопровода с предложениями внедрения комплекса разработанных автоматизированных программ при проведении проектных разработок.
{"title":"МОДЕЛИРОВАНИЕ ПРОЧНОСТНЫХ ХАРАКТЕРИСТИК ДВУХСЛОЙНЫХ ТРУБНЫХ КОНСТРУКЦИЙ ПРИ РЕАЛИЗАЦИИ БЕСТРАНШЕЙНОГО МЕТОДА РЕМОНТА С ОЦЕНКОЙ ЭНЕРГОСБЕРЕЖЕНИЯ ПРИ ТРАНСПОРТИРОВКЕ ВОДЫ","authors":"Владимир Орлов, Сергей Зоткин, Дмитрий Петербургский","doi":"10.22337/2587-9618-2022-18-4-91-100","DOIUrl":"https://doi.org/10.22337/2587-9618-2022-18-4-91-100","url":null,"abstract":"Предложены подходы к оценке прочностных характеристик двухслойных трубопроводов, образующихся в результате использования бестраншейной технологии реконструкции ветхих стальных трубопроводных сетей путем протаскивания в них труб из непластифицированного поливинилхлорида (НПВХ). Представлены результаты моделирования процесса забутовки межтрубного пространства между стальной и полимерной трубами с анализом трех состояний двухтрубной системы на предмет обеспечения прочностных характеристик. Выполнены расчета и представлен анализ возможности экономии электроэнергии при использовании труб из НПВХ в двухслойной трубной конструкции при различных температурах транспортируемой воды и стабильной температуре стенки трубопровода с предложениями внедрения комплекса разработанных автоматизированных программ при проведении проектных разработок.","PeriodicalId":36116,"journal":{"name":"International Journal for Computational Civil and Structural Engineering","volume":"22 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88337232","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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