scholarly journals ASSESSMENT OF CARRYING CAPACITY OF THE ROUND IN PLAN REINFORCED CONCRETE FOUNDATION FOR THE SILO

2021 ◽  
pp. 28-37
Author(s):  
Yu. Vybranets ◽  
◽  
S. Vikhot ◽  
S. Burchenya ◽  
I. Babyak ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Strain State ◽  
Technical Condition ◽  
Normal Operation ◽  
Structural Safety ◽  
Building Structures ◽  
Structural Elements ◽  
Safe Operation ◽  
Stress Strain ◽  
Stress Strain State

During the design, installation and operation of silos, they have defects and damage of various kinds, which affect the stress-strain state and durability of structural elements. Timely inspections and determination of technical conditions of structural elements of the structure and the site as a whole, will establish the possibility of its further safe operation or the need to restore operational properties by ensuring structural safety and reliability of structures. Therefore, the development of design schemes, methods of calculating the stress-strain state, life expectancy and further reinforcement for round reinforced concrete elements of silos with local damage, is quite relevant. Improper maintenance and operation of structural elements, as well as errors in the design and installation in the future lead to unusable for normal operation and sometimes an emergency. The development of projects to strengthen existing structures is a very responsible matter. The most common solution for strengthening existing foundations is to increase the area of support of the foundation cushion, which is not always possible in a compact building. The purpose of the work is to determine the technical condition of the building structures of the silo and the results of calculations performed in the PC Lira, to offer options for strengthening the foundation on a specific example. Structural solutions of the reinforced concrete monolithic foundation of the silo, the main defects and damages determined by the technical condition of the structure are given. For further safe operation of the structure, it is recommended to reinforce the wall foundations by gluing composite tapes and perform reinforcement of the foundations by controlling the growth of piles in accordance with the additional working design of the structure reinforcement. If the latest recommendations on strengthening and adhering to the safe and reliable operation of construction and structures are followed, further operation of building structures will be safe.

scholarly journals Static analysis of a reinforced bimodulus beam on elastic foundation

2018 ◽  
Vol 196 ◽  
pp. 02003 ◽  
Author(s):  
Alexey Beskopylny ◽  
Elena Kadomtseva ◽  
Grigory Strelnikov
Keyword(s):  
Reinforced Concrete ◽  
Cross Section ◽  
Strain State ◽  
Building Materials ◽  
Elastic Base ◽  
Reinforced Concrete Beams ◽  
Building Structures ◽  
Maximum Deflection ◽  
Stress Strain ◽  
Stress Strain State

The work considers a reinforced concrete beam made of bimodule material on an elastic Winkler base. The influence of the number of reinforcing bars located in the stretched zone on the maximum normal stress and the maximum deflection is numerically investigated. The choice of the cross-section dimensions, such as the width and thickness of the flanges, the height of the beam, causes particular difficulties and is limited by the need to determine specific ratios of I-beam sizes. Numerical investigation allows analyzing the influence of the width of the I-beam flange that is in contact with the elastic base on the maximum tensile stresses and maximum deflection. The effect on the stressed-deformed state of the various cross-section forms is carried out in work for an I-beam, a rectangle, and a T-beam. Related to the fact that for many building materials the elastic moduli for tension and compression differ, it became necessary to determine the influence of material heterogeneity on the stress-strain state of the elements of building structures. In particular, the widespread use of reinforced concrete beams as elements of band foundations requires a refinement of the stress-strain state study taking into account the heterogeneity of concrete.

scholarly journals Stress-Deformed Condition at Different Angle of Scratch Inclination on Flat Cover of Hatch-Blade

2021 ◽  
Vol 346 ◽  
pp. 03096
Author(s):  
Aleksey Rubtsov ◽  
Zinur Mukhametzyanov ◽  
Petr Kulakov ◽  
Veronika Gracheva
Keyword(s):  
Strain State ◽  
Vertical Axis ◽  
Operating Conditions ◽  
Structural Elements ◽  
Technical Documentation ◽  
Safe Operation ◽  
Stress Strain ◽  
Stress Strain State ◽  
Axis Of Symmetry ◽  
Flat Cover

Defects of mechanical origin are quite often found on the structural elements of the devices of the production facilities of the fuel and energy complex. One of the most common mechanical defects is scratches and hairlines on the outer surface of the structural elements. The current regulatory and technical documentation establishes standards for the rejection of defects of various types, which provide for the decommissioning of objects with unacceptable defects for repair or subsequent dismantling. However, in most cases, mechanical defects such as scratches are within acceptable sizes and do not have a decisive effect on the life, reliability and safe operation of vessels and apparatus. However, the presence of such defects can change the stress-strain state of the object to a more unfavorable side, and therefore accelerate the process of accumulating damage at points of concentration of increased stresses. Subsequently, places with a concentration of increased voltages under certain operating conditions can be sources of premature destruction of the element and failure of the object as a whole. Therefore, the actual work is the simulation of the stress-strain state of the flat manhole cover with a scratch, having a different arrangement. In this work, the stress-strain state of the flat manhole cover is examined depending on the location of the scratch on it at a different angle relative to the vertical axis of symmetry of the cover.

DEFORMATION CRITERIA FOR SPECIAL LIMIT STATE OF RC FRAME BAR ELEMENTS IN COMPRESSION

2020 ◽  
Vol 91 (5) ◽  
pp. 59-69
Author(s):  
S.Yu. SAVIN ◽  
Keyword(s):  
Reinforced Concrete ◽  
Strain State ◽  
Limit State ◽  
Normal Operation ◽  
Deformation Analysis ◽  
Concrete Element ◽  
Stress Strain ◽  
Limiting State ◽  
Emergency Situations ◽  
Stress Strain State

At emergency situations caused by the sudden removal of one of the load-bearing elements from the building frame, a stress-strain state is more disadvantageous in comparison with their stress-strain state at the stage of normal operation. In cases where the eccentrically compressed elements have an "elegant" section, or have acquired environmental (corrosion) or mechanical (chips) damages during operation, as a possible scenario for the exhaustion of their bearing capacity is buckling. The paper proposes an approach to the construction of deformation criteria for assessing the special limiting state of eccentrically compressed bar elements of reinforced concrete frames. The approach is based on the use of a combination of nonlinear deformation analysis and nonlinear form stability analysis. It is shown that the limiting values of deformations for the considered reinforced concrete element can be determined by the criteria of strength or stability, depending on the ratio of the sizes and structure of sections of the bar elements, as well as the ratio of the forces acting in them.

The Use of Electromagnetic-Acoustic Method for Estimating the Stress-Strain State of the Metallic Elements of Power Equipment

2017 ◽  
Vol 743 ◽  
pp. 463-467 ◽  
Author(s):  
Ilvina Gamirovna Khusnutdinova ◽  
Musa Gumerovich Bashirov
Keyword(s):  
Transfer Function ◽  
Strain State ◽  
Acoustic Method ◽  
Technical Condition ◽  
Integral Parameter ◽  
Metallic Elements ◽  
Electromagnetic Acoustic Transducer ◽  
Stress Strain ◽  
Stress Strain State ◽  
Generating Equipment

As the title implies the article deals with the problem of stress-strain assessment of metallic elements in power-generating equipment. An electromagnetic-acoustical method is proposed to test and diagnose the technical condition of power apparatuses. It is stressed that the transfer function is an integral parameter that makes it possible to assess the condition of metal in a unit under test. The studies established the relationship between the quantitative values of polynomial roots of the transfer function in the system “a unit under test - electromagnetic acoustic transducer” and the level of the stress-strain state of metal.

scholarly journals CONTROL OF ACTIONS OF STEEL TANK IN WORKING

2018 ◽  
Vol 22 (4) ◽  
pp. 66-74 ◽  
Author(s):  
A. A. Vasilkin
Keyword(s):  
Strain State ◽  
Low Cycle Fatigue ◽  
Operating Conditions ◽  
Maximum Effect ◽  
Safe Operation ◽  
Stress Strain ◽  
Load Bearing ◽  
Stress Strain State ◽  
Steel Tank ◽  
Steel Tanks

In steel tanks made by the method of rolling, defects of a geometric shape often occur in the area of the welded welded joint of the wall. Subsequently, in these areas, as a result of low cycle fatigue, an unacceptable defect appears in the form of a crack, which makes it necessary to remove the reservoir from operation and carry out a set of measures for its repair. To determine the terms of safe operation of vertical steel tanks with geometric defects, it is proposed to use the methodology control of the actions of structures of load-bearing structures, one of the directions of which is the regulation of the stress-strain state of steel structures. To implement the possibility of regulating construction, it is necessary to identify such parameters, the change of which will give the maximum effect in achieving the set goals. As the indicated parameters, the design characteristics (material properties, design scheme, geometric characteristics) and factors of external influences (load, operating conditions) can act. To regulate the stress-strain state design of vertical steel tanks, the following regulators are proposed: product loading height, wall deflection arrow and permissible number of tank loading cycles. By numerical calculation of the VAT of the vertical steel tank design with geometric defects, the necessary values and values of the stress state are determined. Further, using known analytical dependencies from the field of fracture mechanics, it is possible to determine the permissible number of loading cycles of the reservoir before the appearance of a crack-like defect. The application of the methodology control of the actions of structures load-bearing structures, by means of a certain change in the established control parameters, allows increasing the number of loading cycles of the reservoir, thereby increasing the period of safe operation of the defective reservoir and thereby increasing the economic efficiency of the tank farm.

Investigation of the Stress-Strain State of a Steel Column Base Connection for Seismic Regions

2022 ◽  
Vol 906 ◽  
pp. 93-98
Author(s):  
Tigran Dadayan ◽  
Lusine Karapetyan
Keyword(s):  
Reinforced Concrete ◽  
Strain State ◽  
Main Type ◽  
Industrial Building ◽  
Stress Strain ◽  
Concrete Foundation ◽  
Stress Strain State ◽  
Steel Base ◽  
Steel Column ◽  
Seismic Regions

Currently, the main type of connection between a steel column and a reinforced concrete foundation is a steel base, which is often economically unprofitable due to its size, number or diameter of anchor bolts. Not only in Armenia, but also in most countries, a steel base is the main type of connection between a steel column and a reinforced concrete foundation. The usage of other types of connections is associated with both new calculation methods and technological problems. The possibility of computation and design of the connection of a steel column with a reinforced concrete foundation in seismically active regions using shear studs is considered in this work, a reinforced concrete section with longitudinal reinforcement is used for this type of connection which ensures a smooth transfer of forces from the column to the foundation. Based on the example of the connection of a single-story industrial building column shows the change in the stress-strain state of the connection under axial force and bending moments for seismic regions. Not only the feature and construction technology of the connection considered in the work, but also proposes a calculation method with future possibility of its subsequent inclusion in the building codes of the Republic of Armenia.

Designing of Details Taking into Account Degradation of Structural Ceramics at Exploitation

2015 ◽  
Vol 752-753 ◽  
pp. 268-271 ◽  
Author(s):  
Valery V. Kuzin ◽  
Stanislav Grigoriev ◽  
Marina Volosova ◽  
Mike Fedorov
Keyword(s):  
Rational Choice ◽  
Strain State ◽  
Structural Elements ◽  
Structural Ceramics ◽  
Stress Strain ◽  
Stress Strain State ◽  
New Generation

Composite character of ceramics is a base for creating new generation materials. It is established that the rational choice of the basic structural elements allows to control stress-strain state of the "loaded" ceramics and to slow down process of its degradation. The developed method of designing of details taking into account ceramics degradation at exploitation is described.

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