Mid-Life Structural Assessment of Transit Rail Cars at WMATA

Joint Rail ◽  
2002 ◽  
Author(s):  
Marcin N. Taraszkiewicz
Keyword(s):  
Body Structure ◽  
Significant Deterioration ◽  
Structural Assessment ◽  
Door Opening ◽  
Critical Areas ◽  
Structural Deterioration ◽  
Operational Life ◽  
Vehicle Component ◽  
Inspection Work ◽  
Non Destructive

The Washington Metropolitan Area Transit Authority (WMATA) contracted with Booz Allen Hamilton to conduct a non-destructive structural assessment of the 2000 and 3000 series rapid transit rail cars. The main goals of the assessment were to identify any significant changes that have occurred to key elements of the car body structure since their date of manufacture and to confirm that no significant and obvious structural deterioration or damage exists. The methodology behind selecting a small representative sample of cars is discussed as an introduction to this work. The paper then discusses the process by which several critical areas were selected for non-destructive inspection. One of the biggest challenges in successfully completing this project was not interfering with WMATA’s fleet operating requirements. The use of WMATA facilities had to be coordinated to create minimum interference with WMATA’s daily maintenance activities. Also, the inspection work had to be planned in such a way as to minimize the amount of vehicle component disassembly in order to return the vehicle to revenue service as soon as possible. The inspections produced valuable results regarding the construction and condition of these cars. The structural welds of the car appear to have performed satisfactorily through the operational life of the cars to date without any significant deterioration. Some corrosion was noted in the door opening areas of the cars, particularly at the door thresholds. The findings of this report will be used to target specific areas of the car during the upcoming mid-life rehabilitation project.

Sociological dimension of economic globalization: world trends and Ukrainian realities (Second part. Social changes in Ukrainian society in the context of economic globalization)

2020 ◽  
pp. 68-110
Author(s):  
Tetiana Petrushyna ◽  
Anatolii Arseienko
Keyword(s):  
Economic Globalization ◽  
Division Of Labour ◽  
Social Consequences ◽  
Social Discourse ◽  
Social Changes ◽  
Significant Deterioration ◽  
Global Competitiveness ◽  
Critical Areas ◽  
Systemic Crisis ◽  
Ukrainian Society

Globalization remains the most common and quite controversial concept in modern social discourse. Within the theoretical and conceptual sociological dimension, the authors analyzed the essence of economic globalization (EG) as its defining type. They studied globalization as an objective process (first of all, the international division of labour) and the subjective process of forming a global capitalist economy under the auspices of leading Western countries, supranational financial and economic institutions (primarily the World Bank and the IMF), TNCs. As the main drivers of globalization, they determine its forms and directions in the interests of the "core" of global capitalism. Within the empirical sociological dimension of EG (which involves measuring the various manifestations of the EG process itself as well as its social consequences), the authors paid particular attention to the analysis of social changes in Ukrainian society. The capitalization of the Ukrainian economy, which took place in parallel with Ukraine’s entry into the global economic space, led to degradation of the national economy, significant deterioration of living standards of most citizens, creation of anti-social state with the systemic crisis as its main attribute. To prove these conclusions, the authors analyzed the dynamics of the principal macroeconomic and sociological indicators of Ukrainian society’s life for almost 30 years of drift to the roadside of the global capitalist world, based on the study of numerous domestic and foreign sources. The authors focused on the research of eight critical areas of social changes: deindustrialization of the economy, global competitiveness and innovation, GDP dynamics, employment, income and welfare of the population, socioeconomic inequality, debt dependence and degradation of Ukrainian science. The analysis shows the need to abandon the neoliberal paradigm of development and search for the alternative and more fair models of EG.

scholarly journals Embedded Smart Antenna for Non-Destructive Testing and Evaluation (NDT&E) of Moisture Content and Deterioration in Concrete

Sensors ◽  
2019 ◽  
Vol 19 (3) ◽  
pp. 547 ◽  
Author(s):  
Kah Teng ◽  
Patryk Kot ◽  
Magomed Muradov ◽  
Andy Shaw ◽  
Khalid Hashim ◽  
...  
Keyword(s):  
Moisture Content ◽  
Smart Antenna ◽  
Building Performance ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Structural Deterioration ◽  
Concrete Failure ◽  
Concrete Blocks ◽  
Non Destructive

Concrete failure will lead to serious safety concerns in the performance of a building structure. It is one of the biggest challenges for engineers to inspect and maintain the quality of concrete throughout the service years in order to prevent structural deterioration. To date, a lot of research is ongoing to develop different instruments to inspect concrete quality. Detection of moisture ingress is important in the structural monitoring of concrete. This paper presents a novel sensing technique using a smart antenna for the non-destructive evaluation of moisture content and deterioration inspection in concrete blocks. Two different standard concrete samples (United Kingdom and Malaysia) were investigated in this research. An electromagnetic (EM) sensor was designed and embedded inside the concrete to detect the moisture content within the structure. In addition, CST microwave studio was used to validate the theoretical model of the EM sensor against the test data. The results demonstrated that the EM sensor at 2.45 GHz is capable of detecting the moisture content in the concrete with linear regression of R2 = 0.9752. Furthermore, identification of different mix ratios of concrete were successfully demonstrated in this paper. In conclusion, the EM sensor is capable of detecting moisture content non-destructively and could be a potential technique for maintenance and quality control of the building performance.

Non-destructive Structural Assessment Method using Imaging technology and Infrared Thermography

2014 ◽  
Vol 102 (7) ◽  
pp. 2893-2900
Author(s):  
Masato Matsumoto ◽  
Koji Mitani ◽  
Necati F. Catbas ◽  
Shuhei Hiasa
Keyword(s):  
Infrared Thermography ◽  
Assessment Method ◽  
Structural Assessment ◽  
Imaging Technology ◽  
Non Destructive

scholarly journals Investigation Strategy for Structural Assessment of Historic Towers

2020 ◽  
Vol 5 (12) ◽  
pp. 106
Author(s):  
Antonella Saisi ◽  
Carmelo Gentile
Keyword(s):  
Dynamic Testing ◽  
Modal Testing ◽  
Structural Behaviour ◽  
Destructive Testing ◽  
Structural Assessment ◽  
Damage Survey ◽  
Emergency Operations ◽  
Local Problems ◽  
Historical Masonry ◽  
Non Destructive

Historical masonry towers are relevant architectural heritage often in a strategic position within city centres. Their height and position require specific controls in order to define the state of preservation. The paper describes the investigation procedures developed by the authors in selected case studies. According to the timing and to the complexity of the structure, the approach requires preliminary visual inspections, geometric, crack pattern survey supplemented by historical research and stratigraphic survey. Operational modal testing evaluates the overall structural behaviour, indicating eventual local (or global) problems to study in depth by monitoring or further local tests. Emergency operations, such as controls after earthquakes, could require prompt procedures. In this case, the combination of visual inspection, geometric and damage survey with dynamic testing is a reliable procedure for structural assessment. Additional investigation increases the knowledge of local problems or gives information for further activity such as structural modelling. For instance, relevant data are the evaluation of the masonry quality or the control of the local state of stress to estimate through non-destructive or minor destructive testing in selected positions. Nevertheless, such activities require accurate projects of the investigation too, planning and localising several tests in order to solve the problems detected in the preliminary steps of the diagnosis process.

Non-Destructive Testing and Inspection of Unfired Pressure Vessels Subject to Cyclic Loads in EN 13445-5

2005 ◽  
Author(s):  
Guy Baylac ◽  
Ian Roberts ◽  
Stephen Maddox ◽  
Erik Zeelenberg
Keyword(s):  
Fatigue Analysis ◽  
Pressure Vessels ◽  
Cyclic Loads ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Critical Areas ◽  
Non Destructive

This paper deals with non destructive testing (NDT) and inspection of cyclically-loaded unfired pressure vessels designed to EN 13445. It details specific provisions contained in Annex G of EN 13445-5 for shape imperfections and areas identified in the fatigue analysis that can limit the lifetime of the vessel (referred to as fatigue critical areas).

The Examination and Tests of Welded Parts for Steam Power Plant

1939 ◽  
Vol 142 (1) ◽  
pp. 261-287 ◽  
Author(s):  
A. H. Goodger
Keyword(s):  
Heat Treatment ◽  
Power Plant ◽  
Extensive Experience ◽  
Steam Power ◽  
Butt Welding ◽  
X Ray ◽  
Large Numbers ◽  
Inspection Work ◽  
Routine Inspection ◽  
Non Destructive

The object of the paper is to give the results of certain experimental and routine inspection work rather than to lay down rules of inspection and testing. An outline is given of the margin obtained between some of the properties and requirements of actual drums and the specified limits. European practice appears to favour acetylene welding for the butt welding of tubes. Normally acetylene welds do not suffer from basal cracking, but they do suffer from lack of penetration; the paper gives methods by which this can be avoided, and suggests forms of joints for tubular welds. The inspection of tubular welds presents many problems, but certain non-destructive tests have been successfully applied, and a number of X-ray examinations on site are described. A useful method of inspecting large numbers of tubular welds by sample consists in carrying out a reverse bend test on a tongue sawn out of the tube and pressed round a former. The paper also contains the results of extensive experience of the heat treatment of welds on site.

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