scholarly journals RESEARCH OF STRENGTH OF CONTACT OF THE PLASTIC PIPE ANDCONCRETE WHEN CALCULATING PLASTIC PIPE CONCRETE STRUCTURES

2019 ◽  
pp. 38-45
Author(s):  
А. Долженко ◽  
Aleksandr Dolzhenko ◽  
А. Наумов ◽  
A. Naumov ◽  
А. Шевченко ◽  
...  
Keyword(s):  
Strain State ◽  
Plastic Shell ◽  
Stress Strain ◽  
Concrete Core ◽  
Friction Forces ◽  
The Core ◽  
Stress Strain State ◽  
Numerical Studies ◽  
Plastic Pipe ◽  
Tangential Friction

This article presents numerical studies of the stress-strain state of centrally compressed short plastic-tube-concrete (PTC) cylindrical cores, having experimentally obtained and analyzed the influence of the tangential friction forces at the boundary of the concrete core and plastic shell layers on the stress-strain state of the PTC core under the assumption of elastic work of the core materials and shell. The need for these studies is associated with a lack of theoretical and numerical studies of the influence of tangential friction forces on the stress-strain state of this type of structural elements, including the classical solution with a steel shell. In this regard, mathematical modeling and the creation of engineering methods for calculating the PTC based on the study of the actual joint work of the concrete core and the cylindrical plastic shell has significant scientific potential. The performed calculations demonstrated the relevance with engineering accuracy of using the mathematical model of a short PTC rack for engineering calculations and structural analysis of the structure. It has been established that the use of an analytical model allows us to study the effect of variations in the physical and mechanical characteristics of the materials of the core and shell of the PTC on the parameters of the stress-strain state of the structure and to rationally design the PTC elements in the construction of civil and industrial buildings with reference to the widely used materials market.

Experimental Studies of the Parameters of the Contact Problem in the Design of Plastic Tube Concrete Structures

2019 ◽  
Vol 974 ◽  
pp. 542-550
Author(s):  
Alexander V. Dolzhenko ◽  
Andrey E. Naumov ◽  
Andrey V. Shevchenko ◽  
N. Stoykovich
Keyword(s):  
Rational Design ◽  
Strain State ◽  
Experimental Studies ◽  
Steel Tube ◽  
Plastic Shell ◽  
Stress Strain ◽  
Plastic Tube ◽  
Concrete Core ◽  
Stress Strain State ◽  
Numerical Studies

The article presents numerical studies of the stress-strain state of the centrally compressed short plastic-concrete-tubal vertical constructions (PCT). The authors experimentally obtained and analyzed the effect of friction on the boundary between the layers of the concrete core and the plastic tube on the stress-strain state of the PCT vertical constructions. The need to carry out these studies is associated with a deficiency of theoretical and numerical studies of this phenomenon, including for the traditional pipe concrete in a steel tube. In this regard, mathematical modeling and the creation of engineering methods for calculating the PCT based on the study of the factual joint operation of the concrete core and the cylindrical plastic shell has significant scientific potential. The calculations and experimental analysis demonstrated the validity with engineering accuracy of using the mathematical model of a short PCT column for engineering calculations and structural analysis. It has been established that the use of an analytical model makes it possible to investigate the influence of the variation of the physical and mechanical characteristics properties of the materials of the core and tube of the PCT on the parameters of the stress-strain state design and to carry out a rational design of the PCT elements in the structures of civil and industrial buildings with reference to the materials actually used widely represented in the market.

scholarly journals Numerical and experimental investigations of steel-concrete beams with thin-walled section

Vestnik MGSU ◽  
2019 ◽  
pp. 22-32
Author(s):  
Farit S. Zamaliev
Keyword(s):  
Experimental Data ◽  
Computer Simulation ◽  
Strain State ◽  
Concrete Beams ◽  
Concrete Structures ◽  
Stress Strain ◽  
Stress Strain State ◽  
Numerical Studies ◽  
Field Samples ◽  
Thin Walled

Introduction. Conducted is to the evaluation of the stress-strain state of the steel-concrete beams with thin-walled section. In recent times, steel-reinforced concrete structures have become widely used in civilian buildings (beams, slabs, columns). Thin-walled section have not found wide application in steel concrete structures, unlike steel structures. Presents the results of numerical studies of beams consisting of concrete, anchors and steel beams. Two investigating of the location of anchors are given. Numerical investigations are presented of steel-concrete beams with thin-walled section based on numerical studies. Testing procedure and test result are given. Results of calculations, comparison of numerical and experimental studies are presented. Materials and methods. For full-scale experiments, steel I-beams with filling of side cavities with concrete were adopted, screws are used as anchor ties, with varied both the lengths and their location (vertically and obliquely). As steel curved C-shaped steel profiles were used steel profiles from the range of the company “Steel Faces”. ANSYS software package was used for computer modeling. A total of 16 steel concrete beams were considered, for which the results of strength and stiffness evaluation were obtained in ANSYS. Results. The data of the stress-strain state of beams on the basis of computer simulation are obtained. The results are used for the production of field samples. Data of computer simulation are compared with the indicators of field experiments. Conclusions. The stress-strain state of steel-concrete structures was studied on the basis of numerical and experimental data. The proposed calculation method gives good convergence with the experimental data. Anchor connections made from self-tapping screws can be used in studies for modeling in steel-concrete beams structures and other anchor devices, ensuring the joint operation of concrete and steel profiles in structures.

scholarly journals STUDIES OF THE STRESS-STRAIN STATE OF REINFORCED CONCRETE BEAMS REINFORCED WITH CARBON FIBER

2021 ◽  
Vol 82 (4) ◽  
pp. 101-110
Author(s):  
I.S. Bondar ◽  
◽  
Al Dulaimi Salman Dawood Salman ◽  
D.T. Aldekeyeva ◽  
R.S. Imambaeva ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Carbon Fiber ◽  
Strain State ◽  
Concrete Beams ◽  
Field Studies ◽  
Reinforced Concrete Beams ◽  
Stress Strain ◽  
Reinforced Plastics ◽  
Stress Strain State ◽  
Numerical Studies

The article examines field studies of reinforced concrete beams, fracture schemes, and the nature of the formation, development of cracks in reinforced concrete elements. Modeling the stress-strain state of reinforced concrete beams in the ANSYS software and computational complex, comparing the results of field and numerical studies. A method of finite element modeling of beams reinforced with fiber plastics (carbon fiber reinforced plastics) is proposed. A comparison of fracturing schemes obtained as a result of numerical simulation is presented.

scholarly journals ANALYTICAL AND NUMERICAL STUDIES OF THE STRESS-STRAIN STATE OF ROUND PLATES ON AN ELASTIC BASE WITH A VARIABLE BED COEFFICIENT

2020 ◽  
Author(s):  
Krutii Yurii ◽  
Surianinov Mykola ◽  
Soroka Mykola ◽  
Karnauhova Ganna
Keyword(s):  
Strain State ◽  
Elastic Base ◽  
Variable Coefficients ◽  
The Finite Element Method ◽  
Round Plate ◽  
Stress Strain ◽  
The Third ◽  
Stress Strain State ◽  
Numerical Studies ◽  
Elastic Resistance

The results of the study of the stress-strain state of a circular plate of constant cylindrical stiffness lying on an elastic foundation with a variable coefficient of elastic resistance are presented. Eight calculation options are considered − four each for a concrete round slab and for a steel round plate − under two conditions of fastening (hinged and rigid along the entire contour) and two laws of variation of the bed coefficient (according to the linear law and according to the law of the concave parabola). To solve the problem, the authors applied a general analytical method for solving differential equations with variable coefficients. The finite element method is used to verify the results. Comparison shows that the results coincide very well in deflections, differing in the third or fourth decimal places, and somewhat worse − in moments.

Analysis of the Stress-Strain State of Ceramic Brick when Tested for Compressive Strength

2019 ◽  
Vol 974 ◽  
pp. 510-514
Author(s):  
Irina A. Serebryanaya ◽  
Andrey A. Matrosov ◽  
Natalia A. Poryadina ◽  
Arkady N. Soloviev
Keyword(s):  
Strain State ◽  
Surface Preparation ◽  
Breaking Load ◽  
Standard Test ◽  
Test Method ◽  
Ceramic Brick ◽  
Stress Strain ◽  
Friction Forces ◽  
Stress Strain State ◽  
Scale Experiment

The article analyzes the change in the stress-strain state of ceramic brick samples when tested in compression, depending on the variable parameters - the type of sample and the method of surface preparation. The experiment showed that the friction forces arising in the “sample-plate test press” zone of contact have a significant effect on the deformation conditions of the samples and lead to an uneven distribution of the breaking load over the surface. This in turn leads to an overestimation of the strength characteristics of the lot, and, consequently, to errors in the calculations of the bearing capacity of the structures. A numerical analysis of the stress distribution also showed that for the samples aligned by grinding and with the help of a mortar; the effect of compression caused by friction forces can be traced. Thus, the results of the numerical experiment are in good agreement with the results of the full-scale experiment. To increase the reliability of the test results, it is necessary to reduce the influence of friction forces and provide conditions for the realization of uniaxial compression. In this regard, it is necessary to adjust the standard test method, namely to use the technical felt gaskets as a method of preparing the surface.

scholarly journals Concrete-faced rockfill dams: experience in study of stress-strain state

Vestnik MGSU ◽  
2019 ◽  
pp. 207-224 ◽  
Author(s):  
Vladislav B. Soroka ◽  
Mikhail P. Sainov ◽  
Denis V. Korolev
Keyword(s):  
Numerical Modeling ◽  
Reinforced Concrete ◽  
Strain State ◽  
Stress Strain ◽  
Linear Character ◽  
Stress Strain State ◽  
Operation Conditions ◽  
Numerical Studies ◽  
Deformation Properties ◽  
The Impact

Introduction. At present the urgent problem in hydraulic construction is establishing the causes of crack formation in seepage-control reinforced concrete faces at a number of rockfill dams. For solving this problem the studies are conducted of stress-strain state (SSS) of concrete-faced rockfill dams which are fulfilled by different methods. Materials and methods. Gives a review and analysis of the results of studies of stress-strain state of concrete-faced rockfill dams (CFRD) fulfilled by different authors over the last 15 years. The results of analytical, experimental and numerical studies are considered. Descriptions are given of the models used for simulation of non-linear character of rockfill deformation at numerical modeling of dam SSS. Results. Analysis showed that solving the problem of CFRD SSS causes a number of methodological difficulties. At present the only method permitting study of CFRD SSS is numerical modeling. The rest methods do not permit considering the impact of important factors on SSS. Large complications are caused by scarce knowledge of rockfill deformation properties in real dams. Conclusions. It was revealed that at present SSS of reinforced concrete faces has been studied insufficiently. The results of conducted studies do not give full and adequate understanding about operation conditions of reinforced concrete faces. Impact of various factors on the face SSS has not been studied. Besides, there are contradictions in the results of studies obtained by different authors. Differences in the results are based on objective and subjective reasons. A considerable obstruction for numerical studies is complicated modeling of rigid thin-walled reinforced concrete face behavior at large deformations inherent to rockfill. The obtained results of studies often do not permit conducting full analysis of SSS of concrete-faced rockfill dams.

Studies of Bearing Elements of the Frame of Hinged Facade Systems, Taking into Account the Progressive Destruction and Temperature Effects

2020 ◽  
Vol 1013 ◽  
pp. 120-124
Author(s):  
Aleksandra Victorovna Frolovskaia ◽  
Inna Y. Petukhova ◽  
Nadezhda Yu. Klinduh ◽  
Irina I. Terekhova ◽  
Yulia M. Petrova
Keyword(s):  
Temperature Effects ◽  
Strain State ◽  
Temperature Influence ◽  
Stress Strain ◽  
Stress Strain State ◽  
Numerical Studies

The authors on the basis of numerical studies have analyzed the effect of progressive destruction and temperature influence on the operation and stress-strain state of the bearing elements of the frame of hinged facade systems.

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