The effect of corrosion on the natural frequency and modal damping of reinforced concrete beams

Razak, H.A. and Choi, F.C. (2001) The effect of corrosion on the natural frequency and modal damping of reinforced concrete beams. Engineering Structures, 23 (9). pp. 1126-1133. ISSN 01410296 , DOI

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An experimental investigation to study the effect of general corrosion on the modal parameters of reinforced concrete beams was conducted. The full scale beams were subjected to reinforcement corrosion until an appreciable amount of steel corrosion damage was introduced. The states of damage in the test beams were assessed through measurement of crack width and spalling. Modal tests were performed on the test beams after corrosion damage and the modal parameters extracted were compared against that from a control beam. The results obtained showed changes in the modal parameters especially natural frequencies and damping ratio. The trend in the measured natural frequencies was sensitive to the deterioration state of the beams. Changes in modal damping ratio for the transfer function method and the normal mode method were also observed. However, the changes were inconsistent with the changes in natural frequencies, as concluded by previous researchers, but a trend was obsedved which was rather mode dependent. Furthermore, the load carrying capacity of the beams was determined through static load test and the results were correlated with the state of corrosion damage and changes in the modal parameters. This investigation provides further insight on the use of modal parameters to detect damage in structural concrete elements which can be useful for structural appraisal and assessment purposes when applied to full scale structures.

Item Type: Article
Additional Information: Cited By (since 1996):38 Export Date: 16 December 2013 Source: Scopus CODEN: ENSTD Language of Original Document: English Correspondence Address: Razak, H.A.; Department of Civil Engineering, University of Malaya, Kuala Lumpur 50603, Malaysia; email: References: Wallbank, R.J., The performance of concrete in bridges: A survey of 200 highway bridges (1989) HMSO, , London: Department of Transport; Daly, A.F., Effects of deterioration on the assessment of concrete bridges (1991) Technical Paper BD/TP/89/91, , Department of Transport, London; Yoshihiro, T., Ken-Ichi, M., Yasuo, K., Mitsunori, K., Mechanical behaviour of RC beams damaged by corrosion of reinforcement (1990) Corrosion of Reinforcement in Concrete, pp. 178-187. , Page CL, Treadaway KWJ, Bamforth PB, editors. Elsevier Applied Science; Choi, F.C., Hashim, A.R., Abdul Ghaffar, A.R., Zubaidah, I., Investigation on the dynamic response of a corroded RC beam (1999) Proceedings of the Sixth International Conference on Concrete Engineering and Technology, , Malaysia: IEM, MARA Institute of Technology, University of Malaya; Nuno, M.M.M., Júlio, M.M.E.S., (1997) Theoretical and Experimental Modal Analysis, , UK: Research Studies Press; Baker, E.A., Money, K.L., Sanborn, C.B., Marine corrosion behaviour of bare and metallic-coated reinforcing rods in concrete (1977) Chloride Corrosion of Steel in Concrete, pp. 30-50. , Tonini DE, Dean SW Jr., editors. ASTM STP 629 American Society for Testing and Materials; Demeter, G.F., Free vibration of two-degree spring-mass systems (1973) Dynamic and Vibration of Structures, pp. 31-35. , Wiley-Interscience; Kato, M., Shimida, S., Vibration of bridge during the failure process (1986) J Struct Eng, ASCE, 112 (7), pp. 1692-1703; Salawu, O.S., Williams, C., Bridge assessment using forced- Vibration testing (1995) J Struct Eng, ASCE, 121 (2), pp. 161-173; Proulx, J., Hébert, D., Paultre, P., Evaluation of the dynamic properties of a steel arch bridge (1992) Proceedings of the Tenth International Modal Analysis Conference, pp. 160-165. , Society for Experimental Mechanics, Vethel CN
Uncontrolled Keywords: Corrosion, Damping ratio, Load carrying capacity, Modal test, Natural frequency, Reinforced concrete, Damping, Modal analysis, Natural frequencies, Spalling, Steel corrosion, Modal parameters, Concrete beams and girders, beam, experimental method
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Divisions: Faculty of Engineering
Depositing User: Mr Jenal S
Date Deposited: 24 Jan 2014 14:40
Last Modified: 20 Oct 2014 06:26

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