scholarly journals Nonlinear design model of reinforced concrete in terms of triaxial deformation

2018 ◽  
Vol 193 ◽  
pp. 03021
Author(s):  
Mikhail Berlinov ◽  
Artem Grigorjan
Keyword(s):  
Reinforced Concrete ◽  
Strain State ◽  
Load Capacity ◽  
Triaxial Stress ◽  
Reinforced Concrete Structures ◽  
Triaxial Deformation ◽  
Triaxial Stress State ◽  
High Rise ◽  
Nonlinear Design ◽  
Concrete Elements

The influence of reinforcement in the concrete work in the conditions of triaxial stress state high-rise construction is considered. The basic phenomenological resolving equations in a triaxial stress-strain state under vibration effects were developed for the calculation of reinforced concrete elements working with and without cracks in terms of nonlinearity and rheology of concrete deformation. A method for linearizing a problem based on integral estimates is proposed, which provides for the fixation of the creep processes in the considered period of time. The implementation of this method will allow us to find a numerical solution of the problem. Such an approach in the design of reinforced concrete structures will allow not only more fully taking into account the real conditions of their work, revealing additional reserves of load capacity, but also opening additional opportunities for analysis and forecasting their functioning at various stages of operation.

scholarly journals Strength resistance of reinforced concrete elements of high-rise buildings under dynamic loads

2018 ◽  
Vol 33 ◽  
pp. 02049 ◽  
Author(s):  
Mikhail Berlinov
Keyword(s):  
Reinforced Concrete ◽  
Strain State ◽  
Load Capacity ◽  
Phenomenological Theory ◽  
Dynamic Loads ◽  
Successive Approximations ◽  
Step Method ◽  
High Rise ◽  
The Finite Difference Method ◽  
Concrete Elements

A new method for calculating reinforced concrete constructions of high-rise buildings under dynamic loads from wind, seismic, transport and equipment based on the initial assumptions of the modern phenomenological theory of a nonlinearly deformable elastic-creeping body is proposed. In the article examined the influence of reinforcement on the work of concrete in the conditions of triaxial stress-strain state, based on the compatibility of the deformation of concrete and reinforcement. Mathematical phenomenological equations have been obtained that make it possible to calculate the reinforced concrete elements working without and with cracks. A method for linearizing of these equations based on integral estimates is proposed, which provides the fixation of the vibro-creep processes in the considered period of time. Application of such a technique using the finite-difference method, step method and successive approximations will allow to find a numerical solution of the problem. Such an approach in the design of reinforced concrete constructions will allow not only more fully to take into account the real conditions of their work, revealing additional reserves of load capacity, but also to open additional opportunities for analysis and forecasting their functioning at various stages of operation.

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 Estimation of the pull-off resistance models of reinforced concrete structures by a numerical method

2021 ◽  
Vol 350 ◽  
pp. 00011
Author(s):  
Mikalai Shalabyta ◽  
Elizabeth Matweenko ◽  
Nikifor Matweenko ◽  
Valery Rakhuba
Keyword(s):  
Numerical Modeling ◽  
Reinforced Concrete ◽  
Comparative Analysis ◽  
Strain State ◽  
Numerical Models ◽  
Tensile Force ◽  
Concrete Structures ◽  
Reinforced Concrete Structures ◽  
New Information ◽  
Concrete Elements

Comparative analysis of calculations of calculation numerical models for pulling out embedded parts in reinforced concrete structures is carried out. Based on the results of numerical modeling, new information about the stress-strain state in reinforced concrete elements from the local action of the tensile force has been obtained.

scholarly journals STRESS STATE OF COMPRESSED REINFORCED CONCRETE ELEMENTS CONSIDERING CREEP AND INFLUENCE OF AN AGGRESSIVE ENVIRONMENT

2021 ◽  
Vol 3 (1) ◽  
pp. 72-82
Author(s):  
M. Bekirova ◽  
Keyword(s):  
Reinforced Concrete ◽  
Strain State ◽  
External Environment ◽  
Reinforced Concrete Structures ◽  
Term Strength ◽  
Aggressive Environment ◽  
Theory Of Aging ◽  
The Impact ◽  
Concrete Elements

Problems associated with the joint long-term action of load and aggressive environment, both in limiting and over-limiting states, are studied bad. Such a combination leads to degradation of materials and changes in the stress-strain state of reinforced concrete structures over time. In case of joint action, they can have mutually increasing damaging effect. Among the many environmental influences encountered, the most aggressive in relation to concrete on cement binder is the impact of sulfates, and in relation to steel reinforcement – the impact of chlorides. It is shown that the stress-strain state of reinforced concrete compressed elements with regard to creep and influence of aggressive environment is formed in time. The deformation in concrete and reinforced concrete compressed elements depends on the stress level. If the stresses are less than the long-term strength, the deformations in time are attenuated, when the stresses in concrete are greater than the long-term strength, the deformations increase. Reinforcement restrains deformations in concrete, while corrosive medium increases creep deformations. When solving these problems we encounter internally statically indeterminate systems. The degree of static indeterminacy is greater than in the case of calculation of reinforced concrete structures without taking into account the influence of the external environment. When the process of soaking is considered, it is possible to consider the influence of the external environment as not aggressive. A solution to the problem using the theory of elastic heredity has been obtained, but it can be shown that a solution using other theories - the theory of aging or the hereditary theory of aging - is also possible. The above solution is true for reinforced concrete elements exposed to external influences at a sufficiently mature age, which can be considered one year or more from the date of manufacture of the structure.

scholarly journals MODELS OF BAY REINFORCED CONCRETE ELEMENTS RESISTANCE AT ACTION OF CYCLE PERMANENT SIGN HIGH LEVEL FORCES

2018 ◽  
Vol 1 (50) ◽  
pp. 112-123 ◽  
Author(s):  
V. M. Karpiuk ◽  
A. I. Kostiuk ◽  
Yu. A. Somina
Keyword(s):  
Reinforced Concrete ◽  
Strain State ◽  
Physical Models ◽  
Cyclic Loads ◽  
Longitudinal Reinforcement ◽  
Calculation Methods ◽  
Cyclic Action ◽  
High Level ◽  
Creep Deformations ◽  
Concrete Elements

The reinforced concrete span beam structures work with small, middle and large shear spans under the action of cyclic loads of high levels is investigated. It is established that researches of physical models development of bending reinforced concrete elements fatigue resistance to the cyclic action of transverse forces and calculation methods on its base are important and advisable due to following features of said load type: the nonlinearity of deformation, damage accumulation in the form of fatigue micro- and macrocracks, fatigue destruction of materials etc. The key expressions of the concrete endurance limits definition (objective strength), longitudinal reinforcement, anchoring of longitudinal reinforcement, which consists the endurance of whole construction are determined. Also the role and the features of influence of vibro-creep deformations on the change mechanics of stress-strain state of concrete and reinforcement of research elements are investigated.

scholarly journals Optimizing of system "column-cfrp lamellas" with the strengthening of civil structures

2021 ◽  
Vol 9 (1) ◽  
pp. 1-5
Author(s):  
Irina Mayackaya ◽  
Batyr Yazyev ◽  
Anastasia Fedchenko ◽  
Denis Demchenko
Keyword(s):  
Reinforced Concrete ◽  
Composite Materials ◽  
Carbon Fiber ◽  
Concrete Structures ◽  
Polymeric Composite ◽  
Concrete Columns ◽  
Reinforced Concrete Structures ◽  
Structural Elements ◽  
Civil Structures ◽  
Concrete Elements

Reinforced concrete elements of structures in the form of columns, beams, ceilings are widely used in the construction of buildings and structures of industrial and civil construction. In most cases, the columns serve as supports for other building elements, for example, crossbars, slabs, girders, beams. One of the cycles of the work of reinforced concrete structures is the state of their repair and reconstruction, including the stages of strengthening the elements. There is a problem of strengthening of reinforced concrete columns. The article deals with the issue of reinforcing columns and other structural elements having a cylindrical surface, with polymeric composite materials in the form of carbon fiber lamellae. The use of composite materials allows to increase the service life and strength of reinforced concrete structures used in construction.

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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