scholarly journals Reinforced concrete structures stress-strain state strengthen with composite materials

2020 ◽  
Vol 869 ◽  
pp. 052003 ◽  
Author(s):  
Valery Telichenko ◽  
Vladimir Rimshin ◽  
Ekaterina Ketsko
Keyword(s):  
Reinforced Concrete ◽  
Composite Materials ◽  
Strain State ◽  
Concrete Structures ◽  
Reinforced Concrete Structures ◽  
Stress Strain ◽  
Stress Strain State

scholarly journals Analysis the effects of lightweight concrete in the middle layer of multi-layered reinforced concrete structures on the stress-strain state using the finite element method

2018 ◽  
Vol 196 ◽  
pp. 02022 ◽  
Author(s):  
Elena Korol ◽  
Vu Dinh Tho ◽  
Nguyen Huy Hoang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Reinforced Concrete ◽  
Strain State ◽  
Concrete Structures ◽  
Reinforced Concrete Structures ◽  
The Finite Element Method ◽  
Stress Strain ◽  
Stress Strain State ◽  
Wide Range

The development of methods for the calculating reinforced concrete structures covers a wide range of issues, including the expansion of the application of new innovative materials such as concrete and reinforcement. For usage in the practice of modern construction of multilayer structures made of concrete with different physic-mechanical characteristics, it is compulsory to conduct numerical studies of the stress-strain state of these structures under different types of loading. This article presents an analysis of the influence of the relations between the initial elastic modulus of the outer and middle layers for the stress-strain state and the deflection of three-layer reinforced concrete structures using the finite element method in the program ANSYS Mechanical. Numerical modeling allows comparing the obtained results and building theoretical dependences in a wide range of specified parameters for the construction of sections of multilayer reinforced concrete elements. The obtained scientific results enable to determine rational parameters for modeling various structural solutions of multilayer reinforced concrete structures. This would limit the number of actual test samples, increasing the efficiency of the experiment.

scholarly journals Field tests and numerical experiments of composite reinforced concrete floor

Vestnik MGSU ◽  
2015 ◽  
pp. 58-67
Author(s):  
Farit Sakhapovich Zamaliev ◽  
Vadim Andreevich Morozov
Keyword(s):  
Reinforced Concrete ◽  
Numerical Experiments ◽  
Strain State ◽  
Concrete Structures ◽  
Field Tests ◽  
Experimental Investigations ◽  
Reinforced Concrete Structures ◽  
Stress Strain ◽  
Concrete Floor ◽  
Stress Strain State

In the recent years there appeared a tendency of widening the use of composite reinforced concrete structures in Russian construction practice, which keeps current the further investigations of their stress-strain state. In order to estimate the stress-strain state of composite reinforced concrete structures different methods are used: both analytical and experimental. In spite of material and labour costs field tests give the most correct indexes of the behavior of structures in actual operating conditions. The experimental investigations of composite reinforced concrete floors of civil buildings having considerable slenderness allow exploring new qualitative data of their stress-strain state. The authors offer the analysis of experimental investigations of composite reinforced concrete structures, in particular, composite reinforced concrete floor. They described geometrical and physical parameters of a test piece, the methods of measurements and tests, the experiment’s results are analyzed. The charts of flexure, stress blocks and distribution of moments are offered. The authors also give the results of numerical experiments and comparisons of stress-strain state of composite reinforced concrete floor with the results of field tests and their analysis.

scholarly journals Experimental-theoretical studies of hydrotechnical angular-type retaining walls

2021 ◽  
Vol 17 (1) ◽  
pp. 82-91
Author(s):  
Fedor A. Pashchenko
Keyword(s):  
Reinforced Concrete ◽  
Strain State ◽  
Experimental Studies ◽  
Concrete Structures ◽  
Retaining Walls ◽  
Variable Load ◽  
Reinforced Concrete Structures ◽  
Stress Strain ◽  
Term Operation ◽  
Stress Strain State

Relevance. Retaining walls are common structures that are part of waterworks. They have the characteristic features of hydraulic structures, such as large dimensions, low percentages of reinforcement (up to 1.0%), horizontal interblock joints. The listed features determine the nature of the work and the stress-strain state of the retaining walls. The main loads on the rear faces of the retaining walls are loads from the action of the backfill soil. The incomplete consideration of the design features and the nature of the loads action in the design of a number of retaining walls that are in the stage of long-term operation has caused the need to strengthen them. One of the reinforcement methods was to install reinforcement rods in drilled inclined holes in the zones of horizontal interblock joints. It was necessary to conduct experimental studies of reinforced concrete retaining walls under the action of various loads, in particular conside- ring the reinforcement by inclined rods. The aim of the experimental research was to study the effect of variable load on the stress-strain state of these structures, among others with due regard to inclined reinforcement installed in the zones of horizontal interblock joints. When solving the set tasks, proven experimental methods of researching reinforced concrete structures of hydrotechnical structures were used. Results. Experimental data from the study of models of retaining walls, including those with reinforcement by inclined reinforcement, at different locations of the resultant load on rear faces of models were obtained. An experimental substantiation of the reinforcement of reinforced concrete structures of retaining walls with an inclined reinforcement crossing horizontal construction joints has been carried out.

scholarly journals Systematic monitoring of the deformed state of long-length reinforced concrete structures with an assessment of their reliability

2021 ◽  
Vol 263 ◽  
pp. 02003
Author(s):  
Aleksandr Perunov ◽  
Aleksey Baulin
Keyword(s):  
Reinforced Concrete ◽  
Strain State ◽  
Concrete Structures ◽  
Reinforced Concrete Structures ◽  
Stress Strain ◽  
Systematic Monitoring ◽  
Stress Strain State ◽  
Deformed State ◽  
Time Of Year ◽  
Building Coating

The article shows the method of systematic monitoring of the stress-strain state of reinforced concrete structures covering one of the operated public railway stations. The description of large-span structures of the building, their defects and damages acquired during the operation of the building is given. The article describes the methodology and methods used for long-term, more than 2 years, continuous monitoring of the deformed state of coating structures in operation. The most damaged structures are examined in detail with the help of installed devices to obtain accurate data. The features of measurements in different periods of time and time of year are described. Based on the results of the obtained measurements of the stress-strain state of the building coating structures, the possibility of their further operation is predicted, taking into account the defects and damages found during the survey.

scholarly journals Consideration of corrosion damages of operated reinforced concrete structures in conditions of triaxial stress - strain state

2020 ◽  
Vol 8 (3) ◽  
pp. 40-46
Author(s):  
Mikhail Berlinov ◽  
Marina Belinova ◽  
A. Tvorogov ◽  
E. Petschkina
Keyword(s):  
Reinforced Concrete ◽  
Strain State ◽  
Concrete Structures ◽  
Corrosion Damage ◽  
Phenomenological Approach ◽  
Triaxial Stress ◽  
Reinforced Concrete Structures ◽  
Stress Strain ◽  
Triaxial Deformation ◽  
Stress Strain State

The problem of linearization of resolving equations for calculating operational reinforced concrete structures under three-axis deformation, taking into account corrosion damage, is considered. A method for accounting for corrosion damage based on a phenomenological approach for deformations under triaxial deformation is presented.

scholarly journals A method for assessing the stress-strain state of reinforced concrete structures

2019 ◽  
Vol 91 ◽  
pp. 02046 ◽  
Author(s):  
Andrew Varlamov ◽  
Vladimir Rimshin ◽  
Sergey Tverskoi
Keyword(s):  
Reinforced Concrete ◽  
Stress State ◽  
Strain State ◽  
Concrete Structures ◽  
Residential Building ◽  
Small Sample ◽  
Reinforced Concrete Structures ◽  
Stress Strain ◽  
Stress Strain State ◽  
Industrial Buildings

The article analyses the modern methods of estimation of stress-strain state of reinforced concrete structures. The result of the analysis is a new method for estimating the stress-strain state of reinforced concrete structures. The method is based on extracting a small sample of concrete from the array. The article describes the method of execution of works, the method of calculating the stresses. Previously, the method was investigated under laboratory conditions. The results are presented in graphs and tables. The research was conducted to assess the stress state of existing concrete structures. As the objects of research, two industrial buildings of 1933 and 1941 construction years were taken. An assessment of a stress state of a panel residential building was held. The measurement results were analyzed. The method for determining the stresses in reinforced concrete buildings and structures is recommended.

scholarly journals Experimental studies of the stress-strain state of reinforced concrete structures strengthened by prestressed basalt-composite rebar

2021 ◽  
Vol 17 (3) ◽  
pp. 288-298
Author(s):  
Oleg D. Rubin ◽  
Sergey E. Lisichkin ◽  
Oksana V. Zyuzina
Keyword(s):  
Reinforced Concrete ◽  
Strain State ◽  
Concrete Structures ◽  
Hydraulic Structures ◽  
Reinforced Concrete Structures ◽  
Theoretical Studies ◽  
Stress Strain ◽  
Stress Strain State ◽  
Internal Forces ◽  
Construction Joints

Relevance. In recent years, composite materials have become widespread in the construction of reinforced concrete structures for industrial, civil and transport structures. It is proposed to strengthen the reinforced concrete structures of hydraulic structures with prestressed basalt composite rebar. It took an experimental and theoretical substantiation of technical solutions to strengthen the reinforced concrete structures of hydraulic structures with prestressed basalt composite reinforcement. The aim of the work was to carry out a set of experimental and theoretical studies of the stress-strain state and internal forces in low-reinforced concrete structures of hydraulic structures reinforced with prestressed basalt composite rebar. Methods. Experimental studies of the stress-strain state and internal forces were carried out on the basis of low-reinforced concrete beam-type models with interblock construction joints, harden with prestressed basalt composite reinforcement in the stretched (compressed) zones of the models. Theoretical studies of the stress-strain state and internal forces were carried out on the basis of the theory of reinforced concrete and structural mechanics. Results. As a result of the research carried out on typical low-reinforced concrete structures of hydraulic structures with interblock construction joints, the main stages of the stress-strain state of hydraulic reinforced concrete structures were formulated. Based on the data of experimental and theoretical studies, taking into account the reinforcement with prestressed basalt composite rebar, as well as with prestressed clamps in the shear zone, a method was developed for calculating the strength of low-reinforced hydrotechnical reinforced concrete structures with interblock construction joints.

scholarly journals Samples of concrete of small sizes

2019 ◽  
Vol 91 ◽  
pp. 02043
Author(s):  
Andrew Varlamov ◽  
Sergey Tverskoi ◽  
Vadim Gavrilov
Keyword(s):  
Reinforced Concrete ◽  
Strain State ◽  
Concrete Structures ◽  
Small Samples ◽  
Reinforced Concrete Structures ◽  
Standard Samples ◽  
Stress Strain ◽  
Strength And Deformation ◽  
Loss Of Strength ◽  
Reference Samples

The article analyzes the sizes of concrete samples. We revealed a possibility to reduce sizes of samples. We simultaneously carried out tests of standard and small (25x25x100 mm) concrete samples. Small samples were obtained by cutting standard samples. In the course of study, the density, strength, and deformation of standard and small specimens were measured. The results are presented in tables and graphs. The strength of small samples was lower than the strength of reference samples. We identified loss of strength of the samples when cutting concrete. The average characteristics of deformation of concrete remained. Small samples are recommended for use in assessing the stress-strain state of reinforced concrete structures.

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