scholarly journals CALCULATION OF RESIDUAL LIFE OF A BUILDING USING PROBABILISTIC METHODS AND GRAPH THEORY

2020 ◽  
Vol 2 (5) ◽  
pp. 5-12
Author(s):  
M. Shutova ◽  
S. Evtushenko
Keyword(s):  
Graph Theory ◽  
Residual Life ◽  
Technical Condition ◽  
Probabilistic Methods ◽  
Truss Structures ◽  
Complex Method ◽  
Destructive Testing ◽  
Roof Structure ◽  
The City ◽  
Non Destructive

methods and approaches to determining the residual resource of construction objects are considered, methods are analyzed to select the optimal one. To calculate the residual life of structures of the industrial workshop in the city of Saratov, a complex method was applied based on probabilistic methods (for structures whose strength characteristics were determined by non-destructive testing) and using graph theory (for other structures, the technical condition of which was established by external signs ) The established value of the residual resource (time before the onset of an inoperative state) before the reconstruction was 3.8 years, taking into account the operation of structures in the industrial enterprise mode. The residual resource of the building in the mode of the shopping center was 18.1 years, taking into account the reduction in operational loads (there are no crane loads, the roof structure was changed), this resource is insufficient for the object put into operation. In the process of reconstruction, communications, external and internal decoration, improvement of the adjacent territory were restored, truss structures were strengthened, the structures of the coating and external walls were partially replaced. The technical condition of the building was improved, which is reflected in the residual life - 64.7 years, which is more than the design life for buildings of this type. Therefore, a comprehensive calculation of the residual resource is an effective method for determining the scope and types of work on reconstruction and restoration of buildings.

scholarly journals Laboratory stand for development of method and system for continuous non-contact non-destructive testing of technical condition of insulation equipment

2021 ◽  
pp. 80-87
Author(s):  
T. G. Galieva ◽  
◽  
D. A. Ivanov ◽  
M. F. Sadykov ◽  
A. V. Golenishchev-Kutuzov ◽  
...  
Keyword(s):  
Residual Life ◽  
Electrical Equipment ◽  
Technical Condition ◽  
Contact Method ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Electromagnetic Methods ◽  
On Line ◽  
Offline Testing ◽  
Non Destructive

Measurement of partial discharges (PD) is a generally accepted method of diagnosing the insulation of electrical equipment worldwide. Today, the trend is to move from conventional offline testing to online monitoring to predict the service life of insulation. For testing and calibration of the developed new methods with the contact method, a laboratory stand has been developed in accordance with GOST R 55191-2012 (IEC 60270:2000). The article suggests the use of acoustic and electromagnetic methods for a system of continuous non-contact non-destructive testing of the technical condition of insulation equipment, which will allow monitoring insulation equipment online and predicting its residual life. On their basis, a system of «on-line» diagnostics of high-voltage insulators has been developed.

scholarly journals APPLICATION OF A COMPLEX APPROACH TO DETERMINING THE RELIABILITY AND RESIDUAL LIFE OF WOODEN STRUCTURES OF RESIDENTIAL BUILDINGS

2020 ◽  
Vol 8 (1) ◽  
pp. 19-25
Author(s):  
Marina Shutova ◽  
Aleksandr Artukhov ◽  
Sergey Evtushenko ◽  
Maksim Khlupin
Keyword(s):  
Graph Theory ◽  
Residual Life ◽  
Residential Buildings ◽  
Integrated Approach ◽  
Biological Damage ◽  
Roof Structure ◽  
Complex Approach ◽  
Wear And Tear ◽  
Wooden Structures ◽  
The City

the article considers the problem of determining the reliability and residual life of roofs of residential buildings, taking into account an integrated approach, which includes determining the reliability of each element taking into account physical wear and tear and calculating the reliability of the “roof” system using graph theory. Five two-story residential buildings in the Ryazan region were selected as objects for evaluation: in the city of Skopin and in the city of Ryazan. When examining the roof structure, typical damage was revealed: the absence (including fragmentary) of the roof covering, biological damage to the wood by the bark beetle, rot, warping of the boards and others. To assess these damages in determining physical deterioration (by external signs), departmental standards were used, the reliability of roof structures as a system of interconnected elements was determined on the basis of graph theory. It has been established that the roofs of two of the five buildings have reached an inoperative state, and the residual life for the roofs of three buildings ranges from 1 to 14 years.

scholarly journals Assessment of Timber Roof Structures before and after Earthquakes

Buildings ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 528
Author(s):  
Nikola Perković ◽  
Mislav Stepinac ◽  
Vlatka Rajčić ◽  
Jure Barbalić
Keyword(s):  
Test Methods ◽  
Timber Structures ◽  
Destructive Testing ◽  
Policy Makers ◽  
Load Bearing ◽  
Existing Structures ◽  
Roof Structure ◽  
Before And After ◽  
Timber Roof Structures ◽  
Non Destructive

The global objective of sustainable development has been greatly directed toward the preservation of existing structures. Therefore, condition assessment and reconstruction of existing timber structures have been gaining importance in recent times. This is particularly evident on timber roofs whose elements are exposed to degradation, either because of rheological effects or due to the direct influence of moisture and biological factors. In case of accidental events, such as an earthquake, the question of the structure’s condition is essential for the condition of the entire building. In order to prove the load-bearing capacity and serviceability of existing structures, as well as to check the need for reconstruction, it is necessary to define crucial parameters that are influencing the condition of materials, elements, and systems. Although there are many non destructive testing methods, the frequency and scope of their use, as well as the decision-making approach, have not been defined. In the paper, non-destructive and semi-destructive methods frequently used for timber structures are explained. A systematic review of criteria to be used in the assessment of load-bearing timber structures in a seismic active area was the main objective of this paper as well as the illustration of non-destructive and semi-destructive test methods through a case study involving roof construction of a hundred-year-old building in Zagreb, Croatia. Pre- and post-earthquake inspection was made. The overall condition of the roof structure after two significant earthquakes can be assessed as satisfactory given that the observed system is a large-span and massive roof structure. The presented results and identification of typical damages after the earthquake are presented in order to facilitate policy makers and for the future implementation of development strategies in the renovation of the city.

scholarly journals Strengthening of a steel girder with web openings

2019 ◽  
Vol 284 ◽  
pp. 09010
Author(s):  
Andrzej Wojnar ◽  
Edyta Bernatowska
Keyword(s):  
Static Analysis ◽  
Basic Structure ◽  
Technical Condition ◽  
Building Structure ◽  
Limit States ◽  
Steel Girder ◽  
Cultural Center ◽  
Web Openings ◽  
Roof Structure ◽  
The City

The paper presents results of investigation carried out on structure of the cultural center building in Dębica in Poland. Technical condition of mentioned building after 40 years of exploitation did not allow for its further use. In order to check the reliability of the structure, the authorities of the city commissioned an expertise. This study included basic structure measurements, loads statement and static analysis as well as check of limit states. As a result of the conducted analyses, it was found that the roof structure made of steel girder with web openings did not comply with resistant conditions. The paper presents brief description of building structure, numerical analyses and proposals of strengthening the roof girder.

scholarly journals The monitoring of technical condition of cultural heritage objects

2019 ◽  
Vol 91 ◽  
pp. 05020
Author(s):  
Vera A. Akristiniy
Keyword(s):  
Cultural Heritage ◽  
Technical Condition ◽  
Integrated System ◽  
Non Destructive Testing ◽  
Testing Methods ◽  
Destructive Testing ◽  
Complex Monitoring ◽  
Cultural Heritage Objects ◽  
Non Destructive ◽  
Restoration Measures

The article deals with the conservation of cultural heritage objects due to their potential widespread deterioration. The suggestion to solve this problem is to create an integrated system for complex monitoring of cultural heritage objects technical condition. The stages of creating a realtime monitoring system with the choice of non-destructive testing methods, the necessary instruments, and tools, the result of which is the formation of a decision-making mechanism for a particular object, are proposed. Conducting monitoring by means of modeling allows predicting the behavior of structures and the building as a whole, taking into account the implementation of restoration measures.

Advanced Evaluation of Fatigue Phenomena Using Non-Destructive Testing Methods

2016 ◽  
Vol 879 ◽  
pp. 1841-1846 ◽  
Author(s):  
Peter Starke ◽  
Hao Ran Wu ◽  
Christian Boller
Keyword(s):  
Fatigue Life ◽  
Damage Evolution ◽  
Structural Integrity ◽  
Residual Life ◽  
Fatigue Behavior ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Physically Based ◽  
Damage Condition ◽  
Non Destructive

The comprehensive characterization of the change in metallic materials’ microstructure due to an applied load is of prime importance for the understanding of basic fatigue mechanisms or more general damage evolution processes. If those mechanisms and processes are to be understood to a much greater extent, advanced fatigue life calculation methods being far away from linear damage accumulation models, have to be realized providing more than “classic fatigue data” only. Among others the PHYBAL (physically based fatigue life calculation) method including current enhancements and a thereon-based development named SteBLife (step-bar fatigue life approach) have been developed over the last 10 years. These methods allow the efforts in experimentation to be reduced by more than 90 % and therefore offer the possibility to take further fatigue relevant parameters into account. This therefore allows a variety of S,N-curves dependent on those fatigue relevant parameters to be generated with those methods easily establishing a multidimensional dataset. To just name a few examples of those parameters such as the influence of temperature, loading conditions, geometry as well as thermal and mechanical ageing processes on the fatigue behavior can now be calculated in accordance to a process being straightforward leading to an important step with regard to improving the efficiency of assessing structural components. Consequently, safety factors can be defined more in accordance to structural needs, being of highest interest with respect to the increasing number of ageing infrastructure such as highways, bridges or others. A lot of this ageing infrastructure has a strong need to be managed with respect to its structural integrity and the engineering community therefore tries the residual life of this infrastructure to be determined as appropriate as possible. In that context non-destructive testing parameters are increasingly considered to characterize a metallic material’s microstructure allowing more precise information to be obtained regarding the actual damage condition and the integrity of a component. The paper will address the high capability of non-destructive testing techniques for the evaluation of damage evolution processes also with respect to mechanism based fatigue as well as residual life calculations according to PHYBAL and SteBLife.

scholarly journals Safety Evaluation of Quayside Container Crane based on Stress Test

2021 ◽  
Vol 257 ◽  
pp. 03071
Author(s):  
Jun Qiu ◽  
Zheng-qiu Huang ◽  
Li-xin Ren ◽  
Yao-ting Tong
Keyword(s):  
Stress Test ◽  
Safety Evaluation ◽  
Metal Structure ◽  
Technical Condition ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Container Crane ◽  
Potential Safety ◽  
Non Destructive ◽  
Quayside Container Crane

Due to the long service life of a quayside container crane in an enterprise, there is slight corrosion on the surface of metal structure, which has potential safety hazard. In order to master the technical condition of the metal structure of the crane, the stress distribution and change information of the crane are obtained by dynamic and static stress testing and non-destructive testing. According to the analysis and test results, the safety assessment of the whole machine is completed and reasonable management suggestions are put forward.

scholarly journals Service Life Extension of Parachutes with Use of Non-Desctructive and Partially Destructive Testing Methods of Textile Materials

2020 ◽  
Vol 2020 (12) ◽  
pp. 113-122
Author(s):  
Krzysztof Stanisław Szafran ◽  
Ireneusz Kramarski
Keyword(s):  
Service Life ◽  
Raw Materials ◽  
Technical Condition ◽  
Test Stand ◽  
Life Extension ◽  
Destructive Testing ◽  
Emergency Situations ◽  
Advantages And Disadvantages ◽  
Service Life Extension ◽  
Non Destructive

Abstract The specificity of personal rescue and reserve parachutes is the fact that they are practically never used for jumping during their service life as they are intended for use only in emergency situations. Therefore, these parachutes throughout the entire period of use are only periodically aired and repacked every 6-12 months. Airing and repacking is necessary even if the parachute is only stored. Rescue and reserve parachutes’ components wear unevenly because the canopy with the suspension lines is inside the container and the cover, while the external components of the harness and the container undergo typical operational wear. Therefore, the service life of rescue parachutes can even reach 20 years (this refers to the canopy with the suspension lines alone). During normal exploitation, parachutes are subjected to non-destructive visual and tactile inspection in preparation for packing. When a parachute reaches its maximum service life, extension of its service life can be calculated based on its technical condition. The procedure for extending parachute’s service life involves non-destructive tests at a fabric air permeability test stand and partially destructive tests at the strength test stand. In the paper, both methods are described and their advantages and disadvantages are discussed. Also, observations some regarding the packers’ work and the desired new properties of raw materials that could be introduced to the parachute industry are presented.

The Use of the Vibroacoustic Method for Monitoring the Technical Condition of Aero Engines with Extended Time between Overhauls

2015 ◽  
Vol 220-221 ◽  
pp. 283-288
Author(s):  
Jarosław Spychała ◽  
Paweł Majewski ◽  
Mariusz Żokowski
Keyword(s):  
Operating System ◽  
Service Life ◽  
Technical Condition ◽  
Extended Time ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Current State ◽  
Turboprop Engine ◽  
Aero Engines ◽  
Non Destructive

The article presents some aspects of several years of work on the use of the vibroacoustic method (Non-Destructive Testing) for assessing a turboprop engine from a trainer aircraft. The functioning engine does not have an operating system for measuring vibration, and therefore the current levels of vibrations and its changes in trends are not known. In order to extend its service life, performing a number of works was required. On the basis of assessing the current state of the engine, opportunities for further exploitation were identified thus developing methodology for evaluating technical condition regarding the whole population. The paper shortly describes the object and equivalent tests on the engine. The article focuses on the methods prepared for extending life between overhauls required for turboprop engines and discusses the results received during their implementation.

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