scholarly journals JUSTIFICATION AND CHOOSING OF RATIONAL CONSTRUCTIVE CROSSSECTIONS, POSSIBILITIES OF USING IN DIFFERENT CONSTRUCTION DIRECTIONS

2021 ◽  
pp. 20-25
Author(s):  
Svitlana Deryzemlia
Keyword(s):  
Bearing Capacity ◽  
Building Materials ◽  
Concrete Structures ◽  
Strength Properties ◽  
Geometric Parameters ◽  
Building Structures ◽  
Concrete Elements ◽  
Significant Attention ◽  
Modern Building ◽  
Made In

The development of modern construction is closely related to the efficient use problemof building materials in terms of rational use materials’ strength properties. The search of rationalstructure in terms of geometric parameters, the materials use and providing the same bearingcapacity is important question in the modern building. The purpose of article is to carry out acomparative analysis of the geometric and strength characteristics of different reinforced concretecross-sections, and consideration of existing methods for calculating the bearing capacity andassessment of the stress-strain state of reinforced concrete beams.The steel-concrete structures using in different building structures is paid much attention in theworld practice. The steel-concrete structures widespread using leads to the economy of materials,reducing the complexity of manufacture, reducing time erection. The using of reinforced concreteleads to significant economy of steel, and set the new tasks for the engineers in the same time: ownweight and geometric parameters reducing of the cross-section without reducing of bearing capacityin whole. With the search for new structures that would meet the building requirements and usage ofdifferent building, nowadays significant attention pays to the improvement and development of thesteel-concrete elements. During the development and improvement of steel-concrete structures,significant changes have been made in terms of ensuring the joint operation of reinforced concreteand steel. Such structures require constant research and improvement in order to reduce their ownweight, financial costs, etc. The question of finding a rational structure in terms of geometricparameters, the materials using, as well as ensuring the same bearing capacity is currently important

scholarly journals OBJECTS OF TRANSPORT INFRASTRUCTURE: EXPERIENCE OF SCIENTIFIC SUPPORT IN CONSTRUCTION WITHIN THE “QUALITY” CONCEPT IMPLEMENTATION

2019 ◽  
Vol 16 (5) ◽  
pp. 618-634
Author(s):  
I. S. Pulyaev ◽  
S. M. Pulyaev
Keyword(s):  
Reinforced Concrete ◽  
Building Materials ◽  
Concrete Structures ◽  
Economic Feasibility ◽  
Transport Infrastructure ◽  
Building Structures ◽  
Construction Technology ◽  
Scientific Support ◽  
Free Construction ◽  
Modern Building

Introduction. The paper deals with the issues related to the implementation of the “quality” concept in the construction of reinforced concrete transport facilities linked with the scientific support during design and construction. Nowadays this problem particularly relevant in the context of the modern construction solutions, combined with the need to obtain the required properties of concrete structures and ensure the economic feasibility of construction. The aim of the research is to generalize and systematize the main methods and techniques of concrete works, which minimize the defects and cracks while the construction of transport infrastructure.Materials and methods. On the example of different technologies used in the Russian construction over last 10 years, the authors demonstrated the developed methods of obtaining high quality concrete products taking into account tested and proved modern building materials.Results. The results of the research formed the basis of the projects, technological regulations for the production, specifications and standards of organizations, guidelines. Moreover, the results also allowed implementing the concept of “quality” in transport construction based on obtaining defect-free reinforced concrete structures with specified properties, taking into account the use of modern building materials.Discussion and conclusions. The research allows carrying out construction of various massiveness and extent. The obtained results form the basis of construction technology of other industrial and civil construction objects with reinforced concrete application. The paper is interesting and useful for specialists in providing defect-free construction of reinforced concrete building structures, for engineering and technical staff. The authors dedicate the research to the memory of Professor and Doctor of Technical Sciences, A.R. Solovyanchik (1938-2019).

scholarly journals Bearing capacity of RC beams reinforced with high strength rebars and steel plate

2018 ◽  
Vol 230 ◽  
pp. 02003 ◽  
Author(s):  
Taras Bobalo ◽  
Yaroslav Blikharskyy ◽  
Rostyslav Vashkevich ◽  
Myhailo Volynets
Keyword(s):  
Reinforced Concrete ◽  
Bearing Capacity ◽  
Steel Plate ◽  
Concrete Structures ◽  
High Strength ◽  
Strength Properties ◽  
Rc Beams ◽  
Reinforcing Bars ◽  
External Reinforcement ◽  
Effective Use

Nowadays, reducing the material content of not only buildings and structures in general, but also individual constructions is a topical task that can be realized through the use of high-strength concrete and reinforcement, as well as with the use of external reinforcement. The concentrated location of sheet reinforcement on the external the most tense facets of steel and concrete structures increases the operating height of the cross-section, makes it possible to more effectively use the strength properties of steel in comparison with conventional reinforced concrete, and with the same bearing capacity to economize on expenses. Composite and monolithic reinforced concrete structures with external reinforcement are used in various construction sectors around the world. This contributed to the expansion of the use of reinforced concrete for special buildings of power-engineering and hydrotechnical construction. The technical nd econom efficiency, as well as the possibility of using external rebar as formwork for monolithic concrete construction, have been proved. Therefore, there is a need for the study of structures with combined reinforcement, in which high rigidity of steel and concrete structures is combined with an effective use of high-strength reinforcing bars (rebar) without prior tension

Effective Elements of Building Structures from Pipe Concrete

2019 ◽  
Vol 945 ◽  
pp. 80-84
Author(s):  
O.E. Sysoev ◽  
A.Y. Dobryshkin ◽  
Ye.O. Sysoyev
Keyword(s):  
Cross Sections ◽  
High Strength Concrete ◽  
High Efficiency ◽  
High Strength ◽  
Strength Properties ◽  
Building Structures ◽  
Strength Concrete ◽  
Concrete Pipe ◽  
Bending Load ◽  
Concrete Elements

The article is devoted to the investigation of pipe-concrete prestressed structural elements with high efficiency. This is due to a more complete use of the strength properties of structural materials in the pipe-concrete beam. The article presents various methods for calculating pipe-concrete elements. The design of a concrete tube with a prestressed element using high-strength concrete is presented. The results of calculations of various designs are shown and the cross-sections of beams for perception of the same bending load are selected. A comparison is made between the consumption of beam materials of various designs. The effectiveness of the use of pipe-concrete elements for receiving bending loads made of high-strength concrete with prestressed reinforcement is shown in comparison with the construction of beams of traditional high-strength concrete, high-strength concrete pipe-concrete with no prestressing of reinforcement and metal beam, mass of the element, consumption of metal and concrete.

scholarly journals Non-Destructive Testing of Materials in Civil Engineering

Materials ◽  
2019 ◽  
Vol 12 (19) ◽  
pp. 3237 ◽  
Author(s):  
Krzysztof Schabowicz
Keyword(s):  
Building Materials ◽  
Civil Engineering ◽  
Current Trend ◽  
Building Structures ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Acoustic Methods ◽  
Recent Developments ◽  
Concrete Elements ◽  
Non Destructive

This issue was proposed and organized as a means to present recent developments in the field of non-destructive testing of materials in civil engineering. For this reason, the articles highlighted in this editorial relate to different aspects of non-destructive testing of different materials in civil engineering, from building materials to building structures. The current trend in the development of non-destructive testing of materials in civil engineering is mainly concerned with the detection of flaws and defects in concrete elements and structures, and acoustic methods predominate in this field. As in medicine, the trend is towards designing test equipment that allows one to obtain a picture of the inside of the tested element and materials. Interesting results with significance for building practices were obtained.

Simulation of Design Reliability and Bearing Capacity of Normal and Oblique Sections of Span Prestressed Reinforced Concrete Structures

2019 ◽  
Vol 968 ◽  
pp. 267-280
Author(s):  
Olha Ahaieva ◽  
Vasyl M. Karpiuk ◽  
Oleksandr Posternak
Keyword(s):  
Reinforced Concrete ◽  
Bearing Capacity ◽  
Software Package ◽  
Reliability Index ◽  
Optimization Problems ◽  
Concrete Structures ◽  
Design Stage ◽  
Reinforced Concrete Structures ◽  
Design Reliability ◽  
Concrete Elements

The paper studies the influence of various constructive factors on the parameters of design reliability and bearing capacity of span prestressed reinforced concrete structures. With the help of experimental design techniques and an effective software package, 12 adequate mathematical models have been developed and brought to the level of practical use. They allow to predict the reliability and bearing capacity of normal and oblique sections of specified structures for any combinations of concrete class, reinforcement class and reinforcement ratio. These models also allow to investigate both the direction of the change in bearing capacity and reliability index of prestressed reinforced concrete elements with the change of the above-mentioned factors, which is useful in solving some optimization problems at the design stage.

scholarly journals The civil structures bearing capacity assessment for 150 m high reinforced concrete ventilation pipe based on the field and numerical surveys

2020 ◽  
Vol 23 (1) ◽  
pp. 18-26
Author(s):  
M.H. Marienkov ◽  
K.M. Babik ◽  
D.V. Bogdan
Keyword(s):  
Reinforced Concrete ◽  
Bearing Capacity ◽  
Ultrasonic Method ◽  
Concrete Structures ◽  
Capacity Assessment ◽  
Building Structures ◽  
Design Models ◽  
Spatial Design ◽  
Linear And Nonlinear ◽  
Seismic Impacts

In the paper the results of the building structures bearing capacity assessment are presented for a reinforced concrete ventilation pipe with a height of 150 m under seismic effects and tornado loads, taking into account the results of full-scale dynamic and instrumental building structures surveys, based on the linear and nonlinear spatial design models numerical studies. This goal was achieved by solving the following tasks: the vibrodynamic surveys execution; the concrete structures strength determination by an ultrasonic method; development of linear and nonlinear spatial design models of the pipe; the calculations of class F3 tornado effects and intensities 6 (MDE) and 7 (above MDE) seismic impacts. Based on the results of vibrodynamic surveys, the actual dynamic parameters of the ventilation pipe structures were determined (vibration modes, prevailing periods and frequencies during principal modes vibrations). Based on the results of structures instrumental studies by ultrasonic method, the actual characteristics of concrete structures strength are determined. The obtained field data were used in the development of the facility spatial design models. To determine the bearing capacity of structures, the models calculations were performed using the LIRA CAD software package, which is a computer system for structural analysis and design. The calculations were performed for the class F3 tornado loads, as well as the intensities 6 and 7 seismic effects determined by the spectral method. Additionally, the bearing capacity of facility reinforced concrete structures was assessed under extreme loads (intensity 7 seismic impacts and class F3 tornado) taking into account the concrete and reinforcement plastic properties. The structures non-linear static analysis (Pushover analysis) applied in the standards of Ukraine, the European Union, the USA and other countries for the assessment of the operating structures seismic resistance was used. Based on the results of the research, the reinforced concrete ventilation pipe structures stress-strain state parameters under the considered seismic and tornado loads were obtained and the recommendations were prepared to reduce the possible consequences of an intensity 7 earthquake and a class F3 tornado.

scholarly journals The civil structures bearing capacity assessment for 150 m high reinforced concrete ventilation pipe based on the field and numerical surveys

2020 ◽  
Vol 23 (1) ◽  
pp. 18-26
Author(s):  
M.H. Marienkov ◽  
K.M. Babik ◽  
D.V. Bogdan
Keyword(s):  
Reinforced Concrete ◽  
Bearing Capacity ◽  
Ultrasonic Method ◽  
Concrete Structures ◽  
Capacity Assessment ◽  
Building Structures ◽  
Design Models ◽  
Spatial Design ◽  
Linear And Nonlinear ◽  
Seismic Impacts

In the paper the results of the building structures bearing capacity assessment are presented for a reinforced concrete ventilation pipe with a height of 150 m under seismic effects and tornado loads, taking into account the results of full-scale dynamic and instrumental building structures surveys, based on the linear and nonlinear spatial design models numerical studies. This goal was achieved by solving the following tasks: the vibrodynamic surveys execution; the concrete structures strength determination by an ultrasonic method; development of linear and nonlinear spatial design models of the pipe; the calculations of class F3 tornado effects and intensities 6 (MDE) and 7 (above MDE) seismic impacts. Based on the results of vibrodynamic surveys, the actual dynamic parameters of the ventilation pipe structures were determined (vibration modes, prevailing periods and frequencies during principal modes vibrations). Based on the results of structures instrumental studies by ultrasonic method, the actual characteristics of concrete structures strength are determined. The obtained field data were used in the development of the facility spatial design models. To determine the bearing capacity of structures, the models calculations were performed using the LIRA CAD software package, which is a computer system for structural analysis and design. The calculations were performed for the class F3 tornado loads, as well as the intensities 6 and 7 seismic effects determined by the spectral method. Additionally, the bearing capacity of facility reinforced concrete structures was assessed under extreme loads (intensity 7 seismic impacts and class F3 tornado) taking into account the concrete and reinforcement plastic properties. The structures non-linear static analysis (Pushover analysis) applied in the standards of Ukraine, the European Union, the USA and other countries for the assessment of the operating structures seismic resistance was used. Based on the results of the research, the reinforced concrete ventilation pipe structures stress-strain state parameters under the considered seismic and tornado loads were obtained and the recommendations were prepared to reduce the possible consequences of an intensity 7 earthquake and a class F3 tornado.

scholarly journals Influence analysis of the main types of defects and damages on bearing capacity in reinforced concrete elements and their research methods

2019 ◽  
Vol 22 (22) ◽  
pp. 24-29
Author(s):  
Maksym Lobodanov ◽  
Pavlo Vegera ◽  
Zinoviy Blikharskyy
Keyword(s):  
Composite Material ◽  
Reinforced Concrete ◽  
Bearing Capacity ◽  
Strain State ◽  
Complete Separation ◽  
Building Structures ◽  
Joint Work ◽  
Economic Trends ◽  
Single Method ◽  
Concrete Elements

Abstract In current economic trends, changes in construction using are required. It usually leads to changes in value and type of the working load on building structures, with the requirement to rate the technical state and replace or strengthen the elements. An important aspect of determining the residual bearing capacity of damaged bending reinforced concrete elements is the research concerning the influence of difference defects and damages on the change of strength and deformability. In the article main types of damages and defects, methods of studies of damaged reinforced concrete elements and the expediency of usage of this elements are described. However, most methods are suitable only for certain defects and damages due to the large complexity of calculations and the consideration of multifactoriality. Significant complexity of a single method for calculating damaged elements depends on the possible changing stress strain state of an element in combination with certain defects and damages, the presence of a non-complete separation where during loading or alteration of the damaged element the fractions become included in the work, reinforced concrete is the composite material which carrying complexity in calculating the joint work of its components.

scholarly journals Research of stress-deformed state of the rammed monolithic reinforced concrete cone-shaped piles with side and bottom forms from crushed stones

2021 ◽  
Vol 17 (4) ◽  
pp. 335-356
Author(s):  
Elvira R. Kuzhakhmetova
Keyword(s):  
Comparative Analysis ◽  
Bearing Capacity ◽  
Building Materials ◽  
Computational Study ◽  
Geometric Parameters ◽  
Crushed Stone ◽  
Driven Piles ◽  
Pile Design ◽  
Deformed State ◽  
External Loads

Relevance. In the construction of buildings and structures, driven piles with a square cross section are most widely used. To install them in the working position, the percussion method is used. However, in cramped conditions, shock loads can lead to dangerous conditions and destruction of structures of nearby buildings. In such a situation, it is necessary to use rammed piles, since technological solutions for their construction are not associated with shock effects on the soil. One such solution is the new rammed cone-shaped pile design, which is installed without excavation. The aim of the study is to analyze the influence of the geometric parameters of the pile on its bearing capacity under the action of external loads, in particular, the angle of its taper. Methods. The results of a numerical analysis of the stress-strain state of a pile operating in a soil massif were obtained by the finite element method. Results. In the computational study, a comparative analysis of the state of piles of different lengths and geometries under the action of external loads was carried out. The influence of the angle of inclination of the lateral surface of the pile on its bearing capacity is considered. Rationalization of the pile design was carried out taking into account the total costs of building materials. Variants of geometric and design solutions for piles with a length L from 1 to 10 m are proposed. In subsequent articles, it is proposed to consider the effect on the bearing capacity of the pile of the geometric parameters of the crushed stone shell and the lower crushed stone spherical expansion, as well as to carry out a comparative analysis of the numerical results with experimental data obtained in laboratory and field conditions.

scholarly journals SOME TECHNOLOGICAL PARAMETERS OF VIBRATION CENTRIFUGAL EQUIPMENT AS A FACTOR IN CONTROL OF CONCRETE PROPERTIES

2021 ◽  
Vol 6 (1) ◽  
pp. 8-19
Author(s):  
M. Nazhuev ◽  
P. Dzhamilova ◽  
F. Bataeva ◽  
Z. Bakaev ◽  
A. Kukaev ◽  
...  
Keyword(s):  
Bearing Capacity ◽  
Experimental Studies ◽  
Building Structures ◽  
Technological Parameters ◽  
Cross Sectional ◽  
Technological Factors ◽  
Integral Characteristics ◽  
The Cost ◽  
Concrete Elements ◽  
Centrifugal Equipment

An increase in the volume of construction requires innovations in technological, structural and design solutions for reinforced concrete elements. As a result of the centrifugation method, variatropic concretes with different cross-sectional characteristics and structures made from them. Therefore, at the stages of calculation and design of building structures of a variatropic structure, an unreasonably large supply of bearing capacity is usually laid, leading to an impressive rise in the cost of promising building structures. It is proposed to combine centrifugation with vibration to increase the density and ensure a more uniform distribution of the components of the concrete mixture over the wall thickness of an annular section product, in particular columns. Vibration will be ensured through the use of clamps, which are put on the shafts of the installation. Within the framework of the proposed experimental setup for creating vibrocentrifuged samples of annular cross-section with a variatropic structure and a method for their manufacture, the technological parameters of vibration are identified, which have the most significant effect on the characteristics of vibrocentrifuged concrete. In the experiments, the following technological factors varied: the height of the technological protrusions of the clamps and the vibration mode. The problem of assessing the influence of these factors on the integral characteristics of concrete is investigated. The results of experimental studies of the influence of the considered technological factors on the integral characteristics of vibrocentrifuged concrete are presented. The results obtained show the feasibility of continuing the study of rational technological parameters of vibrocentrifugation to improve the characteristics of concrete and regulate its variatropy, which will allow the proposed method to be patented in the future and to design an improved vibrocentrifuged column with more fully utilized reserves of the bearing capacity of building structures.

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