scholarly journals ASSESSMENT OF ECONOMIC AND OPERATIONAL RELIABILITY OF BUILDING STRUCTURES BASED ON THE STUDY OF WAVE CHARACTERISTICS OF NONLINEAR VISCOELASTIC ROD ELEMENTS OF STRUCTURES

2019 ◽  
Author(s):  
G. A. Arshinov ◽  
S. V. Laptev
Keyword(s):  
Operational Reliability ◽  
Building Structures ◽  
Wave Characteristics ◽  
Nonlinear Viscoelastic ◽  
Viscoelastic Rod

scholarly journals Investigation of the criteria for increasing the operational reliability of building frames

2021 ◽  
Vol 1 (47) ◽  
pp. 52-63
Author(s):  
G. Tonkacheev ◽  
I. Rudnieva
Keyword(s):  
Bearing Capacity ◽  
Negative Impact ◽  
Operational Reliability ◽  
Building Structures ◽  
Social Culture ◽  
Building Frames ◽  
Cultural Aspects ◽  
Use Of Resources ◽  
Range Of Functions ◽  
The Impact

Analysis and generalization of previous studies showed that there is no comprehensive solution to the problem of increasing the operational reliability of building frames, reconstruction and modernization of buildings and structures, taking into account a sustainable approach. After the completion of construction, the frame of the building is constantly and steadily changing and wearing out, as a result, requiring an increase in operational reliability, and these processes are associated with the correct decision-making on changing the bearing capacity of structures and on the technology and organization of the corresponding work. To solve this problem, it is necessary to create a general methodology for a system for modeling constructive and technological solutions. The system's methodology is intended to reduce costs while increasing the reliability of frame structures, taking into account social culture, optimal impact on society, efficient use of resources and environmental principles. Particularly acute is the problem of introducing innovative and effective organizational and constructive-technological solutions to ensure the required performance and functionality with a minimum negative impact on the environment, while taking into account the improvement of economic, social, cultural aspects at the local, regional and global levels. In addition, the necessary criteria are an increase of the bearing capacity, a decrease in deformability and the recovery of the operational suitability of building structures. The article investigates a comprehensive solution to the problem of increasing the operational reliability of building frames during the reconstruction and modernization of buildings and structures. Identified internal and external factors of changes, as well as the main criteria for increasing the operational reliability of building frames. Consideration of these factors as a range of functions makes it possible to predict the long-term needs and behavior of the building frame throughout the entire life cycle, taking into account the degradation of building components and the need to restore or strengthen the elements of the building frames. After collecting and analyzing information on the identified factors, a system of technological solutions is proposed that takes into account a sustainable approach to reconstruction and categories such as organizational and technological solutions, structures, materials, economics, management, ecology, social culture, in particular the impact on society and the environment.

scholarly journals Modern systems for monitoring the stress-strain state of hazardous power generating facilities

2021 ◽  
Vol 263 ◽  
pp. 02008
Author(s):  
Anatoly Zemlyansky ◽  
Alexander Zhukov ◽  
Daria Bulavina
Keyword(s):  
Residual Stresses ◽  
Construction Industry ◽  
Strain State ◽  
State Level ◽  
Operational Reliability ◽  
Building Structures ◽  
Stress Strain ◽  
Factors Affecting ◽  
Stress Strain State ◽  
Dominant Direction

The paper considers the issue of effectively increasing the level of operational reliability of power generating nuclear and hydraulic facilities. Over the past 20 years, the number of accidents at these facilities has been growing. There are many factors affecting the collapse of structures, but, according to the authors, the lack of a monitoring system capable of fully assessing not only the stress-strain state, but also the so- called “residual” stresses of the material is the dominant direction of research. The same question is raised at the state level, as evidenced by the requirements of the STO, GOST and Federal laws, to which the authors refer below. The legislative prerequisites (requirements) for the creation of an improved system for monitoring critical structures, corresponding to the development trends of the construction industry, as well as the modernization of the existing fund are listed. The drawbacks and advantages of existing monitoring systems (strain gauge, string, fiber-optic sensors and acoustic emission systems) are analyzed in detail, and the general lack of the possibility of measuring, evaluating "residual" stresses in the material of structures is noted. A fundamentally new system for monitoring the stress-strain state of building structures and power equipment is proposed, which is based on the Foerster effect, a comparison is made with the existing systems described above. The main features and capabilities of the method are noted and options for use at highly important facilities are proposed.

Bifurcation and Strange Behavior for a Nonlinear Viscoelastic Rod System

2013 ◽  
Vol 321-324 ◽  
pp. 13-16
Author(s):  
Zhi Xiang Zhang ◽  
Jing Wu Gao ◽  
Tie Xiong Su
Keyword(s):  
Longitudinal Vibration ◽  
Period Doubling ◽  
Nonlinear Dynamic System ◽  
Nonlinear Material ◽  
Nonlinear Viscoelastic ◽  
Rod System ◽  
Stable Periodic ◽  
Integral Procedure ◽  
Lyapunov Exponent Spectrum ◽  
Viscoelastic Rod

Longitudinal vibration of a nonlinear viscoelastic rod system with one end fixed and another end subjected to an axial periodical excitation was studied under the consideration of transverse inertia. By using Galerkin method, a combined Parametric and Forcing Excited cubic nonlinear dynamic system is derived for hard stiffness nonlinear material. Furthermore, arc-length technique is used for an accurate integral procedure, and numeric results are given detailedly. The process of the system evolved from stable periodic motion to chaos is illustrated in a period-doubling bifurcation graph in a parameter space, and the Lyapunov exponent spectrum is also given that is perfectly consistent with bifurcation process. The strange attractor obtained from Poincaré Map is present, which has different fractal dimension from Duffing’s one, so it may be a new chaotic attractor.

Fine-Grained Concrete for Repair and Restoration of Building Structures

2021 ◽  
Vol 1038 ◽  
pp. 317-322
Author(s):  
Alexandra Shyshkina ◽  
Alexander Shyshkin
Keyword(s):  
Rheological Properties ◽  
Operational Reliability ◽  
Optimal Combination ◽  
Cement Stone ◽  
Building Structures ◽  
Active Components ◽  
Fine Grained ◽  
Concrete Mixtures ◽  
Concrete Properties ◽  
Mineral Fillers

It is determined that the active components of modern concrete are active mineral fillers, such as microsilica, meta-kaolin, ash-bearing or compositions from them, as well as superplasticizers. The optimal combination of these additive modifiers allows you to control the rheological properties of concrete mixtures and to modify the structure of the cement stone in such a way as to provide concrete properties that provide high operational reliability of structures. However, they have certain disadvantages that hamper their widespread use. The purpose of the research is to determine the effect of reaction powders applied simultaneously with colloidal surfactant, on the strength of powdered concrete and the rate of its formation.

Increasing the Bearing Capacity and Operational Reliability of Wooden Structures with Additional Elements

2020 ◽  
pp. 28-32
Keyword(s):  
Bearing Capacity ◽  
Operational Reliability ◽  
Building Structures ◽  
Material Resources ◽  
Advantages And Disadvantages ◽  
Construction Experience ◽  
Design Production ◽  
Structural Methods ◽  
Wooden Structures ◽  
Production And Operation

The article describes the main advantages and disadvantages of wooden structures, considers the main methods for improving their operational reliability as well as ways to solve the problem of reducing the material consumption of wooden structures. The indicator determining the efficiency of using material resources and, therefore, the economy of the structure, the level of methods of design, production and operation of structures is the safety factor. Its acceptable value is determined based on the experience of design and operation, and is found as the ratio of the destructive load to the design load-bearing capacity. The article, based on the analysis of design and construction experience, discusses some structural methods and methods to improve the reliability and durability of wooden building structures, such as reinforcement and the use of a set of perforated fasteners in the form of corners, plates and supports. The elements of structures and technologies for manufacturing wooden building structures using reinforcement, as well as using various types of fasteners, considered in this work, are of the greatest interest and are relevant in modern construction both when designing new structures, and during repair, restoration and reinforcement.

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