The effect of support condition on dynamic parameters

Fayyadh, M.M. and Razak, H.A. (2010) The effect of support condition on dynamic parameters. In: 17th International Congress on Sound and Vibration 2010, ICSV 2010, 2010, Cairo.

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Bridge girders are normally supported on rubber bearings which are subjected to deterioration during the life span of the bridge. Early deterioration of the bearings results in decrease of its stiffness while advanced deterioration can cause total damage of the bearings, whereby the bridge girders will be directly supported on the structural element below it. This paper reports an investigation on the effect of support condition on the dynamic parameters of a simply supported beam. Experimental modal analysis was conducted on the beam under different support stiffness with new and old rubber bearings and without rubber bearings. The natural frequencies and mode shapes were acquired from the test and compared using various algorithms as indicators for the state of the supports. From the results, the flexural natural frequencies showed good sensitivity to the support conditions which makes it a feasible tool for health monitoring purposes. This is applicable to all the bending modes with the exception of mode 3 which showed an opposite trend. The lower modes had higher sensitivity to the differences in support condition and it can be concluded that mode 1 was more reliable in assessing the boundary conditions.

Item Type: Conference or Workshop Item (Paper)
Additional Information: Conference code: 94521 Export Date: 16 December 2013 Source: Scopus Language of Original Document: English Correspondence Address: Fayyadh, M.M.; Dept. of Civil Engineering, Faculty of Engineering, University of Malaya, 50603, KL, Malaysia References: Scott, W.D., Charles, R.F., Michael, B.P., (1997) A Summary Review of Vibration Based Damage Identification Methods, , Engineering Analysis Group. Los Alamos National Laboratory. Los Alamos, NM; Young-Shin, L., Myung-Jee, C., A Study on crack detection using eigen frequency test data (2000) Computers and Structures, 77, pp. 327-342; Johan, M., (2003) Damage Assessment of Civil Engineering Structures by Vibration Monitoring, , Katholieke University Leuven, Faculteit toegepaste Wetenschappen, Arenbergkastell, B-3001 Heverlee (Belgium), ISBN 90-5682-390-6; Choubey, A., Sehgal, D.K., Tandon, N., Finite element analysis of vessels to study change in natural frequencies due to cracks (2006) International Journal of Pressure Vessels and Piping, 83, pp. 181-187; Ricardo, P., Consuelo, H., Juan, M.O., Identification of damage in RC beams using index based on local modal stiffness (2007) Construction and Building Materials, , doi: 10,1016/j.conbuildmat.06.012; Dantiele, Z., Ahmed, E., Michael, F.M.J., Nigel, P., Analysis of change in dynamic properties of a frame-resistant test building (2008) Engineering Structures, 30, pp. 183-196; Dai, W., Moroni, M.O., Roesset, J.M., Sarazin, M., Effect of isolation pads and their stiffness on the dynamic charachteristics of bridge (2006) Engineering Structures, 28, pp. 1298-1306; Thomas, G.C., Todd, G.D., Miguel, E.C., Support conditions for experimental modal analysis (2007) Sound and Vibration Magazine, , issue June; Wolf Jr., J.A., (1984) The Influence of Mounting Stiffness on Frequencies Measured in A Vibration Test, , SAE paper 840480, Society of Automotive Engineering, Inc; Carne, T.G., Support conditions, their effect on measured modal parameters (1998) Proceeding of the 16th International Modal Analysis Conference, pp. 477-483; Ewins, D.J., (2000) Modal Testing: Theory, Practice and Application, , 2nd ed. Research Studies Press Ltd; ACI 318-08 " Building Code Requirements for Structural Concern, 2008UR -
Uncontrolled Keywords: Bending modes, Bridge girder, Dynamic parameters, Experimental modal analysis, Health monitoring, Life span, Mode shapes, ON dynamics, Rubber bearing, Simply supported beams, Structural elements, Support conditions, Bearings (structural), Highway bridges, Natural frequencies, Nonmetallic bearings, Plate girder bridges, Stiffness, Deterioration
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Divisions: Faculty of Engineering
Depositing User: Mr Jenal S
Date Deposited: 27 Jan 2014 02:14
Last Modified: 27 Jan 2014 02:14

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