ENGINEERING RESEARCH AND EXAMINATIONOF BUILDINGS. SPECIAL-PURPOSE CONSTRUCTION

Healthmonitoring of building constructions with crack-like defects

Vestnik MGSU 12/2013
  • Korgin Andrey Valentinovich - Moscow State University of Civil Engineering (MGSU) Doctor of Technical Sciences, Professor, Supervisor, Scientific and Educational Center of Constructions Investigations and Examinations, Department of Test of Structures, Moscow State University of Civil Engineering (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation; +7 (499) 183-54-29; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Zeyd Kilani Leys Zeydovich - Moscow State University of Civil Engineering (MGSU) Junior Research Worker, Scientific and Research Center of Engineering Investigations and Monitoring of Building Structures, Moscow State University of Civil Engineering (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Ermakov Valentine Alekseevich - Moscow State University of Civil Engineering (MGSU) Junior Research Worker, Scientific and Research Center of Engineering Investigations and Monitoring of Building Structures, Moscow State University of Civil Engineering (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 77-83

This article deals with structural inspection of the flaws caused by such factors as overloading, differential settlements of construction’s foundation, etc. In order to detect them and define their type and size, modern non destructive equipment such as ultrasonic tomography mira1040 and ultrasonic flaw detector A 1212 MASTER are used. Since cracks increase the stress, they are one of most dangerous defects, so some calculation for analyzing stresses distributions near the crack tip and the whole construction stress redistribution caused by cracking are required. Such calculations are rather complicated, that's why the most suitable methods are computational methods.Practical application of FEM is known as finite element analysis (FEA). FEA is applied in engineering as a computational tool for performing engineering analysis. In this research Finite Element Method is used for defining danger level caused by cracking in a construction, whether it is a through crack or a surface crack. Two types of meshing near the crack tip were considered. The first is refined mesh near the crack tip, it is done using finite elements of smaller size therefore increasing the number of elements and calculation time. The second mesh is done by skewing mid side nodes of the first row of elements to the 1/4 point for crack tip, so the elements number does not increase, the same as calculation time, while accuracy of calculating stresses near the crack tip matches the accuracy in case of refined mesh.As a research result this article describes the methods of detecting and analyzing the structures that have been flawed during the building operation.

DOI: 10.22227/1997-0935.2013.12.77-83

References
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Using LabVIEW software to collect and process measurement data as partof development of systems of monitoring of bearing structures

Vestnik MGSU 9/2013
  • Korgin Andrey Valentinovich - Moscow State University of Civil Engineering (MGSU) Doctor of Technical Sciences, Professor, Supervisor, Scientific and Educational Center of Constructions Investigations and Examinations, Department of Test of Structures, Moscow State University of Civil Engineering (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation; +7 (499) 183-54-29; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Emel'yanov Valentin Alekseevich - Moscow State University of Civil Engineering (MGSU) Candidate of Technical Sciences, Junior Researcher, Scientific and Educational Center for Engineering Research and Monitoring of Structural Units, Moscow State University of Civil Engineering (MGSU), 26 Yaroslavskoye shosse, Moscow, 129337, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Ermakov Mikhail Valer'evich - Moscow State University of Civil Engineering (MGSU) Junior Researcher, Scientific and Educational Center for Engineering Research and Monitoring of Structural Units, Moscow State University of Civil Engineering (MGSU), 26 Yaroslavskoye shosse, Moscow, 129337, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Zeid Kilani Leys Zeydovich - Moscow State University of Civil Engineering (MGSU) Junior Researcher, Scientific and Educational Center for Engineering Research and Monitoring of Structural Units, Moscow State University of Civil Engineering (MGSU), 26 Yaroslavskoye shosse, Moscow, 129337, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Krasochkin Aleksandr Gennad'evich - Moscow State University of Civil Engineering (MGSU) technician, Scientific and Educational Center for Engineering Research and Monitoring of Structural Units, Moscow State University of Civil Engineering (MGSU), 26 Yaroslavskoye shosse, Moscow, 129337, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Romanets Vladimir Anatol'evich - Moscow State University of Civil Engineering (MGSU) technician, Scientific and Educational Center for Engineering Research and Monitoring of Structural Units, Moscow State University of Civil Engineering (MGSU), 26 Yaroslavskoye shosse, Moscow, 129337, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 134-142

Present-day urban construction trends make buildings taller and the urban environment denser. These developments result in the growth of negative effects produced on existing structures. That’s why the monitoring of the technical condition of structures is of vital importance. Now the most efficient way of forecasting and preventing emergency situations consists in the installation of automated monitoring systems operating in continuous and periodic modes.Monitoring systems may comprise various sensors, devices and measurement elements. Any signal must be coordinated to make sure that the data are accurate and reliable. Moreover, the proposed system (or network) composed of various items of equipment (often produced by various manufacturers) demands appropriate integrated software. The database of LabVIEW drivers can be employed for this purpose.LabVIEW environment is applied for the measurement, testing and management of applications that constitute embedded programming tools needed to develop complex applications designated for computer-aided measurements and data processing. The library of drivers is employed to assure the availability of the most common types of interfaces, sensors and devices. If a user lacks a particular driver, it can be either integrated or developed. The authors have successfully collected and processed the data in the LabVIEW environment of a measurement system based on tensometric sensors attached to experimental items of equipment.

DOI: 10.22227/1997-0935.2013.9.134-142

References
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