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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
  1. Posobie po obsledovaniyu stroitel'nykh konstruktsiy zdaniy [Guidebook on Structural Inspection]. AO «TsNIIPROMZDANIY» Publ., Moscow, 2004.
  2. Andrianov A.A. Vliyanie poverkhnostnykh treshchin na prochnost' betonnykh elementov [Influence of Surface Cracks on the Strength of Concrete Elements]. Vestnik MGSU [Proceedings of Moscow State University of Civil Engineering]. 2011, no. 3, pp. 140—142.
  3. Hoegh K., Khazanovich L., Yu H.T. Ultrasonic Tomography Technique for Evaluation of Concrete Pavements. Transportation Research Record: Journal of the Transportation Research Board. 2011, no. 2232, pp. 85—94.
  4. Hoegh K., Khazanovich L., Worel B.J., Yu T. Subsurface Joint Deterioration Detection: A MnROAD Blind Test Comparison of Ultrasound Array Technology with Conventional Nondestructive Methods. Transportation Research Board Annual Meeting 2013. Available at: http://docs.trb.org/prp/13-2048.pdf. Date of access 10.10.2013.
  5. Michaux C., Grill M. NDT 3D Tomographic Testing Cases on Concrete and National Heritage Buildings. Available at: http://www.germann.org/Publications/Sevilla/NDT%203D%20Tomography,%20Michaux%20and%20Grill.pdf. Date of access: 10.10.2013.
  6. Korgin A.V., Ermakov V.A. Avtomatizirovannaya aktualizatsiya MKE-modeli sooruzheniya v khode monitoringa [Automated Updating of a FEM-model of a Structure in the Process of Monitoring]. Mekhanizatsiya stroitel'stva [Mechanization of Construction]. 2011, no. 7, pp. 2—4.
  7. Korgin A.V., Zakharchenko M.A., Ermakov V.A. Metodika aktualizatsii raschetnoy skhemy sooruzheniya, podvergaemogo protsedure monitoringa [Methods of Updating the Calculation Model of a Construction under Monitoring]. Promyshlennoe i grazhdanskoe stroitel'stvo [Industrial and Civil Engineering]. 2011, no. 3, pp. 28—31.
  8. Basko E.M., Afonin A.S. O kriteriyakh otsenki soprotivleniya khrupkomu razrusheniyu elementov stal'nykh konstruktsiy s uchetom treshchinopodobnykh defektov [On the Evaluation Criteria of Brittle Fracture Resistance of the Elements of Steel Structures with Account for Crack-like Defects]. Promyshlennoe i grazhdanskoe stroitel'stvo [Industrial and Civil Engineering]. 2010, ¹ 9, pp. 41—43.
  9. Silant'ev A.S. Raschet prochnosti naklonnykh secheniy izgibaemykh zhelezobetonnykh elementov metodom konechnykh elementov v KE-kompleksakh Ansys i Abaqus [Strength Calculation of Oblique Sections of Bending Reinforced Concrete Elements by the FEM in Ansys i Abaqus ]. Promyshlennoe i grazhdanskoe stroitel'stvo [Industrial and Civil Engineering]. 2012, no. 2, pp. 71—74.
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Experimental determination of crack resistance characteristics of fiber reinforced concrete

Vestnik MGSU 5/2014
  • Zertsalov Mikhail Grigor'evich - Moscow State University of Civil Engineering (MGSU) Doctor of Technical Sciences, Professor, Department of Soil Mechanics and Geotechnics, Moscow State University of Civil Engineering (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation; +7 (495) 781-80-07; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Khoteev Egor Anatol'evich - Moscow State University of Civil Engineering (MGSU) Master, postgraduate student, Department of Soil Mechanics and Geotechnics, Moscow State University of Civil Engineering (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation; +7 (495) 781-80-07; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 91-99

The samples of fiber reinforced concrete with different fiber concentration, types of fiber, class of concrete were tested. The values of the critical stress intensity factors were determined as well as the strength characteristics of fiber-reinforced concrete of various compositions. Tests were carried out by bending the beams of 400x100x100 mm with a cut. Critical stress intensity factor was determined with the help of the value of the breaking load. The regularities of the influence of the type and concentration of fibers on the strength characteristics of the fiber reinforced concrete were stated. The authors identified key properties of steely and polypropylene fibers and offered their comparison. From these experiments we obtained data for further use in theoretical studies of fiber reinforced concretes structures. This research revealed common patterns of change in the properties of fiber reinforced concrete, depending on the composition. The advantages of different types of fibers were discussed. Valid formula for determining the critical stress intensity factor was found. Adding fiber in different concentrations to the concrete mix increase the tensile strength 3.5-4.5 times for steel fibers and 2-2.5 times for polypropylene fibers. Polypropylene fiber addition leads to decrease in compressive strength of the concrete of up to 8 %, the steel fibers addition, on the contrary, to increase in the compressive strength of concrete up to 20 %. Increase in tensile strength is observed mostly for low-strength concrete. In order to ensure uniform distribution of fibers in the volume of concrete specific methods should be applied.

DOI: 10.22227/1997-0935.2014.5.91-99

References
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  5. Volkov I.V. Fibrobeton sostoyanie i perspektivy primeneniya v stroitel'nykh konstruktsiyakh [Fiber Concrete Condition and Prospects of Application in Building Structures]. Stroitel'nye materialy, oborudovanie, tekhnologii XXI veka [Building Materials, Equipment, Technologies of the 21st Century]. 2004, no. 5, pp. 24—25.
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