- Moscow, Russian Federation
Vera Galishnikova
Moscow State University of Civil Engineering, Rector's Office, Department Member
- Graduate of Saratov State Technical University (Russia) in Civil Engineering - Degree of Engineer - 1982Candidate of ... moreGraduate of Saratov State Technical University (Russia) in Civil Engineering - Degree of Engineer - 1982Candidate of Techn. Science degree from Moscow Institute of Civil Engineering (Russia) - 1991PhD in Civil Engineering from Michigan State University (USA) - 2004Doctor of Techn. Science from Moscow State University of Civil Engineering (National Research University) - 2015Worked in Saratov State Technical University, Volgograd State University of Architecture and Civil Engineering.Currently employed at Peoples’ Friendship University of Russia as a Professor and Director of the Department of Civil Engineering Research interests: Nonlinear analysis of structures, dynamics and stability of structures, modeling of built objects, composite materials for constructionedit
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In this paper the influence of section properties on thin walled beam sections with restrained torsion is studied by considering the angle of twisting for non-uniform torsion. The study is based on the governing equation for non-uniform... more
In this paper the influence of section properties on thin walled beam sections with restrained torsion is studied by considering the angle of twisting for non-uniform torsion. The study is based on the governing equation for non-uniform torsion of thin-walled beam of open and closed cross-sections, including the restrained behavior. The hyperbolic shape functions is used to generate the general solution for homogenous equation as it gives the exact results in accordance with the analytical solution. This study is focused on a bar subjected to torsion with warping of wide-ranging open and closed cross-sections with different value of characteristics number for torsion. The impact of the characteristics number for torsion on different section type is studied and evaluated. The obtained results are compared based on the influence of section properties on the components of the total applied torsion and presented graphical for different value of characteristics number for torsion.
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Abstract The construction of cast-in-situ reinforced concrete structures in the cold season imposes special requirements for the concrete mixes and the technology of work. In the cold season at negative outdoor temperatures, the... more
Abstract The construction of cast-in-situ reinforced concrete structures in the cold season imposes special requirements for the concrete mixes and the technology of work. In the cold season at negative outdoor temperatures, the flowability of the concrete mix decreases, the chemical processes of hardening and curing are slowed down or stopped. Construction works without special additives become very difficult, and in some cases impossible. The aim of the study is to develop a nanomodified high-tech plasticizing additive applied to the conditions concreting and curing at an outdoor temperature of −5 °C. The originality of this additive lies in a complex of four components: sulfo-naphthalene-formaldehyde based superplasticizer (SNF), amorphous nano-silica (nano-SiO2), saponified wood resin (WSR), antifreeze inhibitor (NaNO3). The selected ratio of plasticizing, stabilizing, air-entraining and antifreeze components ensures a stable physical and mechanical properties in terms of strength and workability without segregation. Some regression equations have been developed for better determination of the optimal proportion of superplasticizer dosages. Mathematical models relating the parameters of slump and slump flow with the dosage of a nano-modified additive allow to design the concrete mixes with the required flowability. It is shown that the use of a nano-modified additive prevents the risk of segregation of the concrete mix and ensures the hydration of cement during winter concreting. Nano-modified additive was tested under production conditions.
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Building information systems use topological tables to implement the transition from two-dimensional line drawings of the geometry of buildings to digital three-dimensional models of linear complexes. The topological elements of the... more
Building information systems use topological tables to implement the transition from two-dimensional line drawings of the geometry of buildings to digital three-dimensional models of linear complexes. The topological elements of the complex are named and the topological relations of the complex are described by arranging the element names in topological tables. The efficient construction and modification of topological tables for complete buildings is investigated. The topology of a linear complex with nodes, edges, faces, and cells is described with 12 tables. Three of the tables of a complex are independent of each other and form a basis for the construction of the other tables. A highly efficient construction algorithm with complexity O (number of cells) for typical buildings with an approximately constant number of edges per face and faces per cell of is presented. In practice, building designs and their digital models are frequently modified. A modification algorithm is present...
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... more
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...
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This paper presents the comparative design procedures for steel frame elements using three different International design codes, viz. the American Institute of Steel Construction (AISC), the European Code (EC3) and the Russian Design Code... more
This paper presents the comparative design procedures for steel frame elements using three different International design codes, viz. the American Institute of Steel Construction (AISC), the European Code (EC3) and the Russian Design Code (SP). It focuses on the resistance capacity of steel members subjected to different loads, such as tension, compression and flexure. It compares the formulation of all codes that identify their similarities and differences. The comparative study is performed for a compact rolled I sections with different slenderness and lateral bracing lengths. The results are presented graphically in different ways such as strength curves, Moment capacity versus lateral bracing length and normalized graphs. The comparative study shows that the resistance capacity specified by all specifications can be different for some considered cases. For compression member, SP specifications have higher capacity and economical approach. For flexural member, AISC gives higher c...
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Thin-walled structures are widely used in various structural engineering applications due to their advantage of high bearing strength when compared to self-weight and used in a complex loading situation where subjected to combined... more
Thin-walled structures are widely used in various structural engineering applications due to their advantage of high bearing strength when compared to self-weight and used in a complex loading situation where subjected to combined loadings. When a thin-walled section is subjected to a combined load with restrained torsion, they are ineffective at resisting, resulting in a reduction in beam capacity due to torsion and additional warping stresses. A finite element calculation can be used to analyze a 3D bar of thin-walled structural sections. Different commercial software and studies commonly consider six degrees of freedom at each node of a member for a space frame without considering the effect of warping restraint at the member's ends. This paper presents a finite element calculation for thin-walled sections with restrained torsion using the 14x14 member stiffness matrix, which includes warping as an additional degree of freedom and is commonly used for open thin-walled section...
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Microbiologically induced calcite precipitation, or calcium carbonate CaCO3, is used in remediating cracks and fissures in concrete. Since the microbial activity is pollution-free, natural, that process is extremely desired and may solve... more
Microbiologically induced calcite precipitation, or calcium carbonate CaCO3, is used in remediating cracks and fissures in concrete. Since the microbial activity is pollution-free, natural, that process is extremely desired and may solve concrete cracking without sacrificing mechanical properties. The effects of different nutrient on the self-healing process are elucidated. Nutrients provide the required sources of energy for the bacterial growth and metabolic activities. A species of bacteria Bacillus sphaericus was added to the cement mix at a ratio of 0.6% of cement weight with three organic compounds for nutrients (calcium lactate, yeast extract and peptone) at 0.30% of cement weight. Effects on setting time, rate of water absorption, compressive strength and flexural strength were studied. It was found that bacteria nutrition acts as an accelerator for cement pastes for initial setting time mortar, while acts as a retarder of cement pastes for final setting time for all bacteri...
A space truss is in an unstable configuration if it can displace incrementally without an incremental change in its loading and its supports. The load path which follows after an unstable configuration can be unique (snap-through), or... more
A space truss is in an unstable configuration if it can displace incrementally without an incremental change in its loading and its supports. The load path which follows after an unstable configuration can be unique (snap-through), or there can be several possible load paths (bifurcation). This paper presents a method to detect nearly unstable configurations of a truss, a method to determine the loading, displacements and reactions of the unstable configuration and a method to traverse the load path which follows after the unstable configuration. The detection of structural configurations with singular tangent stiffness matrix is essential because they can be unstable. The secondary paths, especially in unstable buckling, can play the most important role in the loss of stability and collapse of the structure. A new method for reliable detection and accurate computation of singular points on load paths is presented and applied to a space truss subjected to symmetric and asymmetric sn...
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It is hard to imagine architecture and construction without large-span shells of various applications and taking into consideration the requests of architects, the new achievements in numeral modeling of the surfaces and introduction of... more
It is hard to imagine architecture and construction without large-span shells of various applications and taking into consideration the requests of architects, the new achievements in numeral modeling of the surfaces and introduction of new groups of tailored surfaces, the appearance of new forms and types of thin-walled shell structures of this kind is inevitable. The bionic method of solving these tasks pushes the boundaries of these opportunities. The subject being studied is the stress strain state of new uncanonical shell "YASUNI", designed of monolithic reinforced concrete with the use of modern finite element analysis settlement system. The form of the shell is built on the basis of images of the Ecuadorian flora. The form of the shell imitates a leaf of a flower laying on the lay of the land. The triangle finite-element mesh is created with a harmonic fusion of lily and daisy in a single structure. The shell is designed as a solid-cast one, made of different classes of reinforced concrete (В25, В30, В35) with thickness from δ = 5 cm to δ = 10 cm with a step 1 cm without contouring beams. The structure is subjected to self-weight. The article introduces the first results of the research of stress strain state of the shell "YASUNI". The authors continue the research of the work this shell with different geometrical parameters, the boundary conditions with the addition of contour elements. Due to the computing complex SCAD OFFICE, precision of which is enough to perform calculations it is possible to reach the most advantageous technical-and-economic indexes of the researched uncanonical shell. Keywords: shell of uncanonical form, bionic architecture, finite element method, triangle finite-element mesh, stress-strain state, monolithic reinforced concrete structure, computer system SCAD Office
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Petroleum products (PP) used in industrial processes systematically fall on the load-bearing CRC structures and gradually impregnate therein. Currently, available guidelines for the assessment of technical condition and reliability of... more
Petroleum products (PP) used in industrial processes systematically fall on the load-bearing CRC structures and gradually impregnate therein. Currently, available guidelines for the assessment of technical condition and reliability of load-bearing CRC structures do not fully take into account the effect of viscosity of PP that impregnated therein. Our study was performed on the basis of analyzing, generalizing and evaluations of experimental data on the effect of PP of different viscosities on the physical and mechanical properties (PMP) of concrete using the methods of probability theory and mathematical statistics. The obtained results allow to constitute a scientifically substantiated forecast of changes in PMP of PP impregnated load-bearing CRC structures and to provide a quantitative characterization of their technical condition.
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The world nowadays is trying to find alternative approaches to be used in manufacturing instead of consuming raw materials. Using recycled aggregates in new concrete is one of these effective approaches, which in turn reduces the quantity... more
The world nowadays is trying to find alternative approaches to be used in manufacturing instead of consuming raw materials. Using recycled aggregates in new concrete is one of these effective approaches, which in turn reduces the quantity of waste and reduces the required landfills. In this present work, an attempt was made to study the effect of using recycled aggregates as an alternative to raw aggregates in pervious concrete with different levels (0 %, 25 %, 50 %, 75 % and 100 %), in addition to the impact of adding 5 % and 10 % of silica fume as a replacement of cement weight on the pervious recycled aggregate concrete properties. The concerned properties are as follows: fresh and hardened density, fresh and hardened voids content, water permeability, compressive strength, splitting tensile strength, flexural tensile strength, and potential resistance to degradation of the pervious concrete. Additionally, relations between water permeability and other parameters of the pervious ...
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The advancing technologies of self-healing concrete focus on reversing and repairing the micro-cracks that form in concrete at early ages, increasing the durability of the structure. The utilization of the metabolic properties of bacteria... more
The advancing technologies of self-healing concrete focus on reversing and repairing the micro-cracks that form in concrete at early ages, increasing the durability of the structure. The utilization of the metabolic properties of bacteria in bacteria-based self-healing mortar has yielded promising results in the reduction of cracks. Two species of bacteria Bacillus sphaericus (BS), Bacillus pasteurii (BP) were used in this study with two ratios (0.5 % and 0.25 %) of cement weight. Calcium Lactate was added as nutrition of bacteria by (0.25 % and 0.125 %) of cement weight, respectively. Setting time test was performed to measure the effect of bacteria on fresh mortar properties. The bacterial mixtures were compared to control mix to study their behavior under the influence of permeability test, compressive strength test, flexural strength test, sulfate resistance test and acid resistance test. Also, the restoration of bacterial mixes was tested. Furthermore, advanced techniques were ...
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The present proceedings include a selection of papers submitted to the International Conference on Engineering Systems 2020 (ICES 2020), which was held during 14-16 October 2020 in the RUDN University, Moscow, Russia. ICES 2020 was... more
The present proceedings include a selection of papers submitted to the International Conference on Engineering Systems 2020 (ICES 2020), which was held during 14-16 October 2020 in the RUDN University, Moscow, Russia. ICES 2020 was dedicated to the 60th anniversary of RUDN University. International Conference on Engineering Systems (ICES), held annually at the Peoples’ Friendship University of Russia (RUDN University), has created a platform for summarizing research in various areas of engineering. The aim of the conference is to foster and conduct collaborative interdisciplinary research amongst the researchers, professionals and industrialists to share their research experiences and indulge in interactive discussions and special sessions at the event. In light of travel restrictions around the world to control COVID-19 pademic, ICES 2020 adopted the format of virtual conference through Google Meet network to provide a forum for experts and scholars to share real-time information a...
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Research results in shakedown analysis of space steel structures are presented in this paper. The theory of shakedown and conventional methods of analysis are discussed, and the example of a shakedown of a truss-column is provided to... more
Research results in shakedown analysis of space steel structures are presented in this paper. The theory of shakedown and conventional methods of analysis are discussed, and the example of a shakedown of a truss-column is provided to illustrate the concepts of the nonlinear analysis and shakedown for space trusses [1; 4].
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This article contains data of effect of nano-modified additives on the technological properties of concrete mixes for winter concreting. The nano-modified additive, consisting of naphthalene formaldehyde, nano-modified silicon dioxide,... more
This article contains data of effect of nano-modified additives on the technological properties of concrete mixes for winter concreting. The nano-modified additive, consisting of naphthalene formaldehyde, nano-modified silicon dioxide, saponified wood resin and sodium nitrate, ensures the manufacturability of the concrete mix, its quality laying and normal curing at low outdoor temperatures. The nano-modified additive allows prevents the phenomenon of segregation of concrete mixes of grade C12/15. The application of nano-modified additive together with sodium nitrate (4 wt.% of cement) ensures normal conditions for the hydration of cement paste at ambient temperatures from +5 °C to –5 °C. This dataset is associated with a research article entitled “Effect of nano-modified additives on properties of concrete mixtures during winter season” [1].
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This article contains data on equipment failures at thirty- six centralized heating stations. In the process of operation of heating stations, the arising failures can lead to a signifi- cant decrease in air temperature in heated rooms.... more
This article contains data on equipment failures at thirty- six centralized heating stations. In the process of operation of heating stations, the arising failures can lead to a signifi- cant decrease in air temperature in heated rooms. Data was obtained through the study of operational logs. When ana- lyzing the data, we used the records of a five-year observa- tion period (2012 to 2017) taking into account the preven- tive work that carried out annually as part of the preparation of equipment for use in winter conditions. Malfunctions of equipment elements, that arise during the operation of heat supply stations, have different meanings in qualitative and quantitative aspects. Different specialists of the same qual- ification may not represent the same quality characteristics of the same shortcomings. The presentation of faults in the form of sequences of numbers allows to formalize the anal- ysis and reduce the influence of the subjective factor. Data on observations of equipment...
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State of the art in geometrically nonlinear analysis of space frames is presented in the paper. The main difficulties that arise in formulation of incremental equations and the main drawbacks of existing methods are described.
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A method is presented which permits the geometrically nonlinear analysis of structures undergoing arbitrarily large displacements, rotations and strains. This method is based on the general nonlinear theory of elasticity and can be... more
A method is presented which permits the geometrically nonlinear analysis of structures undergoing arbitrarily large displacements, rotations and strains. This method is based on the general nonlinear theory of elasticity and can be applied consistently to different types of structural elements such as beams and plates. The method has so far been implemented for two-dimensional trusses and frames. For several examples of structures with very large displacements and rotations as well as snap-through, the results which are obtained with the method are compared to exact solutions. The convergence of the method to the exact results is demonstrated.
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Relevance. Ductility of basalt fiber reinforced concrete is an interesting property of basalt fiber reinforced concrete. However, very few experiments on this property is documented. The aim of the work. This paper provides a summarized... more
Relevance. Ductility of basalt fiber reinforced concrete is an interesting property of basalt fiber reinforced concrete. However, very few experiments on this property is documented. The aim of the work. This paper provides a summarized analysis and review of existing publications on the ductility of lightweight basalt fiber reinforced concrete. Methods. This paper provides a comprehensive study on ductility of basalt reinforced concrete and lays the framework for proper laboratory experiment on the ductility of basalt fiber reinforced concrete. Results. From the findings of this review paper, ductility of dispersed basalt fiber reinforced concrete depends not only in the percentage of basalt fiber in the concrete but in the length and diameter of the basalt fiber. Increase in the percentage of basalt fiber in the concrete yielded an increase in the concrete ductility.
Research results in shakedown analysis of space steel structures are presented in this paper. The theory of shakedown and conventional methods of analysis are discussed, and the example of a shakedown of a truss-column is provided to... more
Research results in shakedown analysis of space steel structures are presented in this paper. The theory of shakedown and conventional methods of analysis are discussed, and the example of a shakedown of a truss-column is provided to illustrate the concepts of the nonlinear analysis and shakedown for space trusses [1; 4].
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There are numerous software applications available to analyze and design massive projects in short time. Most of the software have 2-dimensional and 3-dimen- sional tools, while various structural engineers employ the use of the 3D... more
There are numerous software applications available to analyze and design massive projects in short time. Most of the software have 2-dimensional and 3-dimen- sional tools, while various structural engineers employ the use of the 3D analysis and design tools in their day-to-day tasks because of its ease to operate and graphical user interface. These tools help in modeling, analyzing, and design of structures much more efficient. Despite the availability of numerous software products, there are confusions on the software to be used in the analysis and design of specific building structures. There is a need of studying the strength and weakness of some of these software tools to help structural engineers in the selection of the best application in their daily tasks. The aim of this study is to investigate the structural analysis of high-rise building with ETABS and RSA software and compare the influences of the structural analysis results from the two software in design. The comparison...
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State of the art in geometrically nonlinear analysis of space frames is presented in the paper. The main difficulties that arise in formulation of incremental equations and the main drawbacks of existing methods are described.
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Relevance. The load on a reinforced concrete slab with high strength lightweight aggregate concrete leads to increased brittleness and contributes to large deflection or flexure of slabs. The addition of fibers to the concrete mix can... more
Relevance. The load on a reinforced concrete slab with high strength lightweight aggregate concrete leads to increased brittleness and contributes to large deflection or flexure of slabs. The addition of fibers to the concrete mix can improve its mechanical properties including flexure, deformation, toughness, ductility, and cracks. The aims of this work are to investigate the flexure and ductility of lightweight expanded clay concrete slabs reinforced with basalt fiber polymers, and to check the effects of basalt fiber mesh on the ductility and flexure. Methods. The ductility and flexural/deflection tests were done on nine engineered cementitious composite (expanded clay concrete) slabs with dimensions length 1500 mm, width 500 mm, thickness 65 mm. These nine slabs are divided in three reinforcement methods types: three lightweight expanded clay concrete slab reinforced with basalt rebars ∅10 mm (first slab type); three lightweight expanded clay concrete slab reinforced with basalt...