scholarly journals Mathematical model for the reinforced concrete with nonlinearity behaviour of bond

2021 ◽  
Vol 2131 (3) ◽  
pp. 032017
Author(s):  
A Samoshkin ◽  
V Tikhomirov
Keyword(s):  
Experimental Data ◽  
Mathematical Model ◽  
Reinforced Concrete ◽  
Concrete Specimen ◽  
Contact Layer ◽  
Limit States ◽  
Good Correspondence ◽  
Complex Deformation ◽  
Pull Out ◽  
Mathematical Algorithms

Abstract The article developed a mathematical model describing the deformation of reinforced concrete, taking into account its adhesion to reinforcement. The model consists of three layers: concrete, contact layer, reinforcement. The contact layer surrounding the reinforcement takes into account the complex deformation of the concrete when interacting with the profiled reinforcement. Arguments are presented for criteria that determine the transition of concrete, reinforcement and contact layer to limit states. A diagram of testing of reinforced concrete specimen has been proposed and a procedure for processing experimental data, which allow you to determine the bond parameters. Equations that bind the mechanical characteristics of the contact layer with two the bond parameters of concrete with reinforcement are obtained. The developed model was used in the numerical solution of the problem of static pull-out of reinforcement from concrete. The calculation of the finite element method showed a good correspondence with the experimental data, including during plastic deformation of the reinforcement. This shows the correctness of theoretical provisions and developed mathematical algorithms used to model the deformation of reinforced concrete.

Study on the Effect of Bond-Anchoring Factor on Bond Behavior between Deformed Bar and Shale Ceramic Concrete

2011 ◽  
Vol 403-408 ◽  
pp. 444-448
Author(s):  
Wei Jun Yang ◽  
Jie Yu ◽  
Yan Wang
Keyword(s):  
Experimental Data ◽  
Reinforced Concrete ◽  
Comparative Analysis ◽  
Anchorage Length ◽  
Bond Behavior ◽  
Pull Out ◽  
Practical Project ◽  
Deformed Bar

In this paper, the effect of bond-anchoring factor on bond behavior between deformed bar and shale ceramic concrete was analyzed by four groups of pull-out tests with different anchorage length. And three reinforced concrete pull-out tests used for comparative analysis were prepared at the same time. We obtained a series of experimental data and based on these data .A more accurate formula was summed up. This formula has a high value in guiding the practical project to choose the anchorage length.

scholarly journals ANALYSIS OF NONLINEAR STATIC-DYNAMIC DEFORMATION OF REINFORCED CONCRETE FRAMES IN OUT-OF-LIMIT STATES

2021 ◽  
pp. 20-35
Author(s):  
N. V. Fedorova ◽  
Ngoc Tuyen Vu ◽  
M. D. Medyankin
Keyword(s):  
Experimental Data ◽  
Reinforced Concrete ◽  
Dynamic Loading ◽  
Computational Analysis ◽  
Dynamic Deformation ◽  
Limit State ◽  
Concrete Frames ◽  
Limit States ◽  
Reinforced Concrete Frames ◽  
Nonlinear Static

Statement of the problem. The article presents a computational model, an algorithm for computational analysis and the results of calculating the nonlinear static-dynamic deformation of reinforced concrete frames in out-of-limit states caused by the sudden removal of one of the supporting structures. Results. To design a numerical model of the static-dynamic loading mode of a structural system, the LS-DYNA software package was used that makes use of a detailed 3D model implementing an explicit finite element method. During the computational analysis, the physical and mechanical characteristics of the deformation of materials were taken in three variants: those obtained based on the experimental data by G. A. Geniev, the experimental data by N. V. Fedorova and M. D. Medyankin under the static-dynamic uniaxial testing mode of a limited number of standard samples of prisms and according to the Russian standards SP (СП) 385.1325800.2018. Conclusions. Numerical analysis of the static-dynamic deformation of the reinforced concrete framerod system of a multi-storey building has established that the differentiated accounting of the quantitative value of the concrete viscosity modulus and, accordingly, the time and level of static-dynamic loading of the structure allows one to identify the criteria for the special limit state of the elements of reinforced concrete structural systems of buildings and structures in a more rigid manner.

Study on the Effect of Cover Thickness on Bond Behavior between Deformed Bar and Shale Ceramsite Concrete

2011 ◽  
Vol 366 ◽  
pp. 281-285 ◽  
Author(s):  
Jian Yu Yang ◽  
Jie Yu ◽  
Yan Wang
Keyword(s):  
Experimental Data ◽  
Reinforced Concrete ◽  
Comparative Analysis ◽  
Bond Behavior ◽  
Pull Out ◽  
Practical Project ◽  
Cover Thickness ◽  
Deformed Bar

In this paper, the effect of cover thickness on bond behavior between deformed bar and shale ceramsite concrete was analyzed by four groups of pull-out tests which with different cover thickness. And three reinforced concrete pull-out tests used for comparative analysis were prepared at the same time. We obtained a series of experimental data and based on these data a more accurate formula was summed up. This formula has a high value in guiding the practical project to choose the cover thickness.

scholarly journals Numerical simulation of electric heating of dispersed-reinforced concrete with steel fibers

2021 ◽  
Vol 2131 (5) ◽  
pp. 052064
Author(s):  
E Matus ◽  
M Soppa
Keyword(s):  
Experimental Data ◽  
Thermal Conductivity ◽  
Reinforced Concrete ◽  
Steel Fiber ◽  
Electric Heating ◽  
Contact Layer ◽  
Concrete Mixture ◽  
Study Results ◽  
Fiber Concrete ◽  
Steel Fiber Concrete

Abstract Solution to the problem of current density distribution in a fragment of a steel fiber concrete mixture is obtained, using the finite element method. It is shown that the fiber-concrete contact layer makes a significant contribution to the effective electrical conductivity of the mixture. More than 50% of the total current flows through the reinforcing fibers. The conductivity of the mixture increases in proportion to the reinforcement coefficient. It increases 2-3 times, depending on the choice of the contact properties, reinforcing 2% by volume layer. Experimental data that confirm the indicated dependence are presented. Also, a solution to the problem of heat distribution in a fragment of steel-fiber-concrete mixture in stationary and non-stationary modes of external heating and electrode heating was obtained. It is shown that the effective thermal conductivity coefficient increases in proportion to the reinforcement coefficient. A significant effect of the contact layer parameters on thermal conductivity is shown, comparison with experimental data. Significant heat release in the area of contact zone and in fiber leads to a temperature rise in these zones by 20-30 degrees in a stationary mode. The temperature distribution in fiber-reinforced concrete during induction heating is considered. In this case, it is necessary to significantly increase the frequency of the current used. The study results can be used, prescribing electric heating modes for products made of dispersion-reinforced concrete.

Analysis of Nonlinear Static-Dynamic Deformation of Reinforced Concrete Frames in out-of-Limit States

2021 ◽  
pp. 11-24
Author(s):  
Н. В. Федорова ◽  
Нгок Туен Ву ◽  
М. Д. Медянкин
Keyword(s):  
Experimental Data ◽  
Reinforced Concrete ◽  
Dynamic Loading ◽  
Computational Analysis ◽  
Dynamic Deformation ◽  
Concrete Frames ◽  
Limit States ◽  
Reinforced Concrete Frames ◽  
Rod System ◽  
Nonlinear Static

Постановка задачи. Приводятся расчетная модель, алгоритм расчетного анализа и результаты расчета нелинейного статико-динамического деформирования железобетонных рам в запредельных состояниях, вызванных внезапным удалением одной из несущих конструкций. Результаты. Для создания численной модели режима статико-динамического нагружения конструктивной системы использован программный комплекс LS-DYNA с применением детальной 3Д-модели, реализующей явный метод конечных элементов. При проведении расчетного анализа были приняты физико-механические характеристики деформирования материалов в трех вариантах: полученные по опытным данным Г. А. Гениева, по опытным данным Н. В. Федоровой, М. Д. Медянкина при статико-динамическом одноосном режиме испытаний ограниченного числа стандартных образцов призм и по СП 385.1325800.2018. Выводы. Численным анализом статико-динамического деформирования железобетонной рамно-стержневой системы каркаса многоэтажного здания установлено, что дифференцированный учет количественного значения модуля вязкости бетона и соответственно времени и уровня статико-динамического догружения конструкции позволяет более строго определять критерии особого предельного состояния элементов железобетонных конструктивных систем зданий и сооружений. Statement of the problem. The article presents a computational model, an algorithm for computational analysis and the results of calculating the nonlinear static-dynamic deformation of reinforced concrete frames in out-of-limit states caused by the sudden removal of one of the supporting structures. Results. To design a numerical model of the static-dynamic loading mode of a structural system, the LS-DYNA software package was used that makes use of a detailed 3D model implementing an explicit finite element method. During the computational analysis, the physical and mechanical characteristics of the deformation of materials were taken in three variants: those obtained based on the experimental data by G. A. Geniev, the experimental data by N. V. Fedorova and M. D. Medyankin under the static-dynamic uniaxial testing mode of a limited number of standard samples of prisms and according to the Russian standards SP (СП) 385.1325800.2018. Conclusions. Numerical analysis of the static-dynamic deformation of the reinforced concrete frame-rod system of a multi-storey building has established that the differentiated accounting of the quantitative value of the concrete viscosity modulus and, accordingly, the time and level of static-dynamic loading of the structure allows one to identify the criteria for the special limit state of the elements of reinforced concrete structural systems of buildings and structures in a more rigid manner.

The Experimental Research on the Effect of Age on Bond Behavior between Deformed Bar and Shale Ceramic Concrete

2012 ◽  
Vol 502 ◽  
pp. 458-462
Author(s):  
Yan Wu ◽  
Jie Yu ◽  
Yan Wang
Keyword(s):  
Experimental Data ◽  
Reinforced Concrete ◽  
Comparative Analysis ◽  
Experimental Research ◽  
Bond Behavior ◽  
Pull Out ◽  
Bonding Properties ◽  
Deformed Bar ◽  
Effect Of Age

In this paper, the effect of age on bond behavior between deformed bar and shale ceramic concrete was analyzed by four groups of pull-out tests with different age. And three reinforced concrete pull-out tests used for comparative analysis were prepared at the same time. We obtained a series of experimental data and based on these data a more accurate formula was summed up. This conclusion is important for further study on bonding properties of ceramic concrete and has a high value in guiding the actual construction.

The mathematical modelling of corrosion in hot dip galvanized steel reinforced concrete

2011 ◽  
Vol 2 (1) ◽  
pp. 1-12
Author(s):  
A. Hegyi ◽  
H. Vermeşan ◽  
V. Rus
Keyword(s):  
Mathematical Model ◽  
Reinforced Concrete ◽  
Numerical Model ◽  
Equation System ◽  
Galvanized Steel ◽  
Steel Reinforced Concrete ◽  
Numeric Model ◽  
Physical And Mathematical Models ◽  
Physical Phenomena ◽  
The Mathematical Model

Abstract In this paper we wish to present the numerical model elaborated in order to simulate some physical phenomena that influence the general deterioration of steel, whether hot dip galvanized or not, in reinforced concrete. We describe the physical and mathematical models, establishing the corresponding equation system, the initial and boundary conditions. We have also presented the numeric model associated to the mathematical model and the numeric methods of discretization and solution of the differential equations system that describes the mathematical model.

Pull-Out Performance of T-Stub End Plate Connected To Concrete Filled Thin-Walled Steel Tube (CFTST) using Lindapter Hollo-Bolts

2018 ◽  
Vol 15 (1) ◽  
pp. 59
Author(s):  
NAZRUL AZMI AHMAD ZAMRI ◽  
CLOTILDA PETRUS ◽  
AZMI IBRAHIM ◽  
HANIZAH AB HAMID
Keyword(s):  
Limit Load ◽  
Steel Tube ◽  
Limit States ◽  
End Plate ◽  
Pull Out ◽  
Pullout Load ◽  
Thin Walled ◽  
Stub End ◽  
Concrete Filled Steel Tubes ◽  
Ultimate Limit

The application of concrete filled steel tubes (CFSTs) as composite members has widely been used around the world and is becoming popular day by day for structural application especially in earthquake regions. This paper indicates that an experimental study was conducted to comprehend the behaviour of T-stub end plates connected to concrete filled thin-walled steel tube (CFTST) with different types of bolts and are subjected to pullout load. The bolts used are normal type bolt M20 grade 8.8 and Lindapter Hollo-bolt HB16 and HB20. A series of 10 mm thick T-stub end plates were fastened to 2 mm CFTST of 200 mm x 200 mm in cross-section. All of the specimens were subjected to monotonic pull-out load until failure. Based on test results, the Lidapter Hollo-bolts showed better performance compare to normal bolts. The highest ultimate limit load for T-stub end plate fasten with Lindapter Hollo-bolt is four times higher than with normal bolt although all end plates show similar behaviour and failure mode patterns. It can be concluded that T-stub end plate with Lindapter Hollo-bolt shows a better performance in the service limit and ultimate limit states according to the regulations in the design codes.

SETTING A DIAGRAM APPROACH TO CALCULATING VIBRATED, CENTRIFUGED AND VIBROCENTRIFUGED REINFORCED CONCRETE COLUMNS WITH A VARIATROPIC STRUCTURE

2020 ◽  
pp. 22-34
Author(s):  
Л. Р. Маилян ◽  
С. А. Стельмах ◽  
Е. М. Щербань ◽  
М. П. Нажуев
Keyword(s):  
Experimental Data ◽  
Reinforced Concrete ◽  
Bearing Capacity ◽  
Cross Section ◽  
Concrete Columns ◽  
Reinforced Concrete Columns ◽  
The Cross ◽  
Concrete Elements ◽  
Diagram Approach

Состояние проблемы. Железобетонные элементы изготавливаются, как правило, по трем основным технологиям - вибрированием, центрифугированием и виброцентрифугированием. Однако все основные расчетные зависимости для определения их несущей способности выведены, исходя из основного постулата - постоянства и равенства характеристик бетона по сечению, что реализуется лишь в вибрированных колоннах. Результаты. В рамках диаграммного подхода предложены итерационный, приближенный и упрощенный способы расчета несущей способности железобетонных вибрированных, центрифугированных и виброцентрифугированных колонн. Выводы. Расчет по диаграммному подходу показал существенно более подходящую сходимость с опытными данными, чем расчет по методике норм, а также дал лучшие результаты при использовании дифференциальных характеристик бетона, чем при использовании интегральных и, тем более, нормативных характеристик бетона. Statement of the problem. Reinforced concrete elements are typically manufactured according to three basic technologies - vibration, centrifugation and vibrocentrifugation. However, all the basic calculated dependencies for determining their bearing capacity were derived using the main postulate, i.e., the constancy and equality of the characteristics of concrete over the cross section, which is implemented only in vibrated columns. Results. Within the framework of the diagrammatic approach, iterative, approximate and simplified methods of calculating the bearing capacity of reinforced concrete vibrated, centrifuged and vibrocentrifuged columns are proposed. Conclusions. The calculation according to the diagrammatic approach showed a significantly better convergence with the experimental data than that using the method of norms, and also performs better when using differential characteristics of concrete than when employing integral and particularly standard characteristics of concrete.

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