scholarly journals Bending deflection reinforced concrete elements determination

2018 ◽  
Vol 230 ◽  
pp. 02012 ◽  
Author(s):  
Dmitriy Kochkarev ◽  
Taliat Azizov ◽  
Tatyana Galinska
Keyword(s):  
Reinforced Concrete ◽  
Cross Sections ◽  
Equilibrium Equations ◽  
Plastic Properties ◽  
Precise Calculation ◽  
Limited Application ◽  
Building Practice ◽  
Concrete Elements ◽  
Deformation Diagrams ◽  
Determining Factor

Longitudinal reinforced concrete elements stiffness exhaustion, often used in building practice, precedes obtaining bearing capacity, and therefore deflections determination becomes a determining factor in their design. In connection with it precise methods for determining such reinforced concrete elements deflections become especially relevant. The elastic-plastic properties of concrete and cracks in the stretched zone of reinforced concrete elements lead to a significant change in their bending stiffness. That is why the deflections determined by the materials classical resistance formulas differ significantly from the real ones. A large quantity of methods for determining deflections is based on the elastic characteristics correction of reinforced concrete elements consolidated section. Such methods, although providing calculation satisfactory results, are rather approximate and have empirical nature, due to it they have limited application. More precise calculation methods consist of curvature usage to determine deflections. The curvature of reinforced concrete elements cross sections is determined directly from the equilibrium equations, which are written taking into account nonlinear materials deformation diagrams. Calculation examples for bending reinforced concrete elements deflection are given.

Improving the Methodology for Calculating the Bearing Capacity of Eccentrically Compressed Reinforced Concrete Elements Based on the Use of the Refined Curvilinear Deformation Diagrams of Concrete and Reinforcement

2019 ◽  
Vol 974 ◽  
pp. 570-576
Author(s):  
Alexander I. Nikulin ◽  
Al-Khawaf Ali Fadhil Qasim
Keyword(s):  
Reinforced Concrete ◽  
Bearing Capacity ◽  
Linear Equations ◽  
Resistance Force ◽  
Deformation Model ◽  
Concrete Element ◽  
Element Determination ◽  
Numerical Studies ◽  
Concrete Elements ◽  
Deformation Diagrams

The article proposes a new approach to improving the methodology for calculating the bearing capacity of the eccentrically compressed reinforced concrete elements for cases of their loading with large eccentricities. The basis of this technique is considered as a modified version of the deformation model for the reinforced concrete resistance force. The main feature of this model is the energy approach to transforming the reference diagrams of compression and concrete tension into the diagrams of non-uniform deformation, corresponding to the stress-strain state of the compressed and stretched zones of concrete in the cross section of the eccentrically compressed reinforced concrete structures. This way there is no falling branch in the concrete diagrams obtained by this method. A calculation diagram of the steel reinforcement deformation with a physical yield point was taken as a partial function, consisting of one linear and two non-linear equations. The proposed method also shows the possibility of taking into account the greatest curvature of an eccentrically compressed reinforced concrete element in the plane of its loading. The article presents all the necessary dependencies allowing the theoretical value of the carrying capacity of an eccentrically compressed reinforced concrete element determination. The results of the numerical studies performed using the design software developed by the authors for the personal computer are given.

scholarly journals Improved engineering method for calculating the strength of the supporting areas of reinforced concrete elements

2018 ◽  
Vol 230 ◽  
pp. 02014 ◽  
Author(s):  
Olena Krantovska ◽  
Mykola Petrov ◽  
Liubov Ksonshkevych ◽  
Sergii Synii ◽  
Pavlo Sunak
Keyword(s):  
Reinforced Concrete ◽  
Comparative Analysis ◽  
Cross Sections ◽  
Experimental Studies ◽  
Engineering Calculation ◽  
Standard Methods ◽  
Refined Method ◽  
Eurocode 2 ◽  
The World ◽  
Concrete Elements

According to the results of experimental studies, empirical dependencies were obtained (obtained from the appropriate mathematical models). The advanced (refined) method of engineering calculation of express-estimation of the strength of sloping cross sections of elements of flexible reinforced concrete structures on the basis of comparative analysis of the obtained empirical dependencies and standard accepted methods in the world was developed (nine basic norms are taken: DSTU B.V.2.6-156:2010 (Ukraine), previously operating SNiP 2.03.01-84*, SNB 5.03.01-02 (Belarus), SR 63.13330.2012 (Russia), Eurocode 2, 2004 (European Union), ACI 318-M14 (USA), AIJ Code, 2007 (Japan), CSA 23.3-04 (Canada), DIN 1045-1 (Germany). The coefficient of variation of bearing capacity and accident ratio according to the results of calculations of standard methods are determined. Their comparative analysis is carried out and informative graphic figures are presented.

scholarly journals Simulation of the Stress-Strain State of Eccentrically Compressed and Tensioned Reinforced Concrete Beams

2020 ◽  
Vol 2 (1) ◽  
pp. 207-214
Author(s):  
Vasyl Karpiuk ◽  
Yuliia Somina ◽  
Oksana Maistrenko ◽  
Fedir Karpiuk
Keyword(s):  
Reinforced Concrete ◽  
Cross Sections ◽  
Strain State ◽  
Concrete Beams ◽  
Reinforced Concrete Beams ◽  
Improved Method ◽  
Stress Strain ◽  
Stress Strain State ◽  
Strain Behaviour ◽  
Concrete Elements

AbstractThe paper deals with the working peculiarities of the support zones of reinforced concrete elements subject to bending with due account of the eccentric compression and tension. The authors performed simulation of the stress-strain behaviour of the indicated structures with the aid of “Lira” software which results are shown in the graphical and tabulated form. The performed simulation allowed of tracing the work of the studied sample beams till collapse. Such approach made it possible to single out and generalize the main collapse patterns of the inclined cross-sections of the reinforced concrete elements subject to bending on which basis the authors developed the improved method to calculate their strength (Karpiuk et al., 2019).

Rational Placement of a Steel Fiber in Sections of the Combined and Monolithic Bent Reinforced Concrete Elements

2018 ◽  
Vol 931 ◽  
pp. 358-361 ◽  
Author(s):  
Yusup M. Hasauov
Keyword(s):  
Reinforced Concrete ◽  
Cross Sections ◽  
Steel Fiber ◽  
Analytical Dependence ◽  
Economical Design ◽  
The Cross ◽  
The Individual ◽  
Concrete Elements

In the article some considerations to optimize the cross-sections of prefabricated-monolithic combined reinforced bent elements are given. The analytical dependence that allows more economical design of the structures in question taking into account the strength and quantity parameters, as well as the geometric dimensions of the individual components of the prefabricated-monolithic section and their relationships is proposed.

The Concrete Diagrams Integral Parameters in the Calculations of Reinforced Concrete Elements by Limiting States

2019 ◽  
Vol 974 ◽  
pp. 698-703
Author(s):  
Valeriy A. Eryshev
Keyword(s):  
Reinforced Concrete ◽  
Neutral Axis ◽  
Stress Profile ◽  
Deformation Model ◽  
Gravity Center ◽  
Stress Diagram ◽  
Internal Forces ◽  
Concrete Elements ◽  
Deformation Diagrams ◽  
Base Diagrams

The paper proposes a method for calculating the reinforced concrete elements strength according to the deformation model using the deformation diagrams of concrete and reinforcing steel materials, which eliminates the complicated procedure of numerical integration of stresses in the element section during the transition to generalized internal forces. Integral parameters of diagrams are introduced into the energy model for calculating the strength of reinforced concrete elements along with the deformations and stresses normalized values at the base diagrams’ points. The integral parameters are calculated for the element cross section, the strain at the stress diagram gravity center in the compressed concrete zone and the coordinates of force in the concrete and reinforcement are relative to the neutral axis from the condition of the stress profile shape compliance in the element compressed zone, and the concrete diagram is used in the calculations. The integral parameters calculated dependences for the compressive strength concrete classes. The recommendations on the concrete diagrams integral parameters values rationing and their use in the complex sections and statically indeterminable systems calculations are given.

scholarly journals APPROACH TO AN ESTIMATION DEFORMABILITY OF BENDING CONCRETE ELEMENTS BASED ON ITERATIVE CALCULATION METHOD

2016 ◽  
Vol 2 (1) ◽  
pp. 73-76
Author(s):  
Крючков ◽  
Andrey Kryuchkov ◽  
Жданов ◽  
Aleksandr Zhdanov
Keyword(s):  
Reinforced Concrete ◽  
Structural Analysis ◽  
Calculation Method ◽  
Load Bearing Capacity ◽  
Successive Refinement ◽  
Iterative Calculation ◽  
Composite Section ◽  
Initial Stress Method ◽  
Concrete Elements ◽  
Deformation Diagrams

The article deals with existing methods for evaluating the load bearing capacity and deformability of bent reinforced-concrete elements, including the composite section. The analysis of idealized nonlinear dependencies and compressed concrete deformation diagrams. Iterative methods for structural analysis: the method of successive refinement of stiffness, the method of successive loadings, initial stress method. Results of their algorithms and shows the advantage of using the method of the dual stiffness are considered.

scholarly journals Residual resource of power resistance during building structures deformation

2019 ◽  
Vol 135 ◽  
pp. 03009 ◽  
Author(s):  
Ekaterina Kuzina ◽  
Vladimir Rimshin ◽  
Alexey Neverov
Keyword(s):  
Reinforced Concrete ◽  
Cross Sections ◽  
Residual Life ◽  
Deformable Body ◽  
Bending Moment ◽  
Discrete Models ◽  
Building Structures ◽  
Resistance To Deformation ◽  
Concrete Elements ◽  
Research And Design

Modern scientific research and design developments, based on the fundamental principles of physics, mechanics and thermodynamics, are developing in a phenomenological direction. This implementation is found both in traditional integrated models of reinforced concrete using the advantages of computer technology, and in discrete models following the grid methods of solid deformable body mechanics. Discrete models in content and chronology over time are hereditary with respect to integral models. The theoretical basis for calculating the residual life of the force resistance to deformation, determines the stiffness of the cross sections of reinforced concrete elements with a maximum bending moment and with zero bending moment are presented in this article.

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