Stiffness Assessment through Modal Analysis of an RC Slab Bridge before and after Strengthening
Publication: Journal of Bridge Engineering
Volume 11, Issue 5
Abstract
As part of Main Roads Western Australia’s (MRWA) bridge management and bridge upgrading program, MRWA bridge no. 3014 was assessed to evaluate its condition before and after strengthening works with carbon-fiber-reinforced-polymers (CFRP). The assessment process coupled analytical results with field observations and dynamic testing of the structure. Vibration-based structural assessment of the bridge was conducted before and after the completion of the upgrading works. This paper presents the results of the vibration tests and modal analysis performed before and after the structure upgrading. In particular, the change in the structural properties and stiffness, before and after the strengthening, based on the analyses of the updated models of the bridge, is presented and discussed. The results demonstrate the effectiveness of using the dynamic assessment method to determine the elastic flexural stiffness of bridge structures retrofitted with CFRP.
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Acknowledgments
The authors would like to thank Adam Lim and Jock Scanlon of MRWA and Peter Coughlan of BG&E for providing the structural information for MRWA bridge no. 3014, the assistance and support during the testing sessions, and the opportunity for carrying out a dynamic-based assessment of the structure. Many thanks to Minhdu Nguyen, Craig Boston, Jim Waters, Alex Duff, and Wayne Galbraith for their help in the test preparation and on-site work. Partial financial support from the Australian Research Council, under grant LP0453783, is also acknowledged.
References
Abdel Wahab, M. M., and De Roeck, G. (1998). “Dynamic testing of prestressed concrete bridges and numerical verification.” J. Bridge Eng., 3(4), 159–169.
BGE. (2001a). “Bridge no. 3014 on Walkaway-Nangetty Road over Greenough River, shire of Greenough—Load rating report.” Ref. 10369.04-004/3014 Rev 1, BG&E, Perth, WA, Australia.
BGE. (2001b). “Engineering report on material testing and the implications to rated load capacity for bridges 795, 205 and 3014.” Ref. 10369.04-005 Rev 0, BG&E, Perth, WA, Australia.
BGE. (2004a). “Bridge no. 3014, Walkaway-Nangetty Road, midwest region, shire of Greenough—work summary report.” Ref. 11285.00-037/3014 Report N. 01 Rev A, BG&E, Perth, WA, Australia.
BGE. (2004b). “Engineering report on additional material testing of reinforcing steel for bridges 795, 205 and 3014.” Ref. 10369.04-008 Rev 0, BG&E, Perth, WA, Australia.
Brownjohn, J. M. W., Lee, J., and Cheong, B. (1999). “Dynamic performance of a curved cable-stayed bridge.” Eng. Struct., 21(11), 1015–1027.
Brownjohn, J. M. W., Moyo, P., Omenzetter, P., and Yong, L. (2003). “Assessment of highway bridge upgrading by testing and finite-element model updating.” J. Bridge Eng., 8(3), 162–172.
Brownjohn, J. M. W., and Xia, P. Q. (2000). “Dynamic assessment of curved cable-stayed bridge by model updating.” J. Struct. Eng., 126(2), 252–260.
Ewins, D. J. (2000). Modal testing—Theory, practice and application. Research Studies Press Ltd. Baldock, Hertfordshire, U.K.
Gazetas, G. (1983). “Analysis of machine foundation vibrations: State-of-the-art review.” Int. J. Soil Dyn. Earthquake Eng., 2(1), 2–42.
Haritos, N. (2004). “Assessing the characteristics of structural systems using dynamic testing.” Proc., 18th Australasian Conference on the Mechanics of Structures and Materials, Vol II, 1211–1217.
Haritos, N., and Chandler, I. (1999). “Structural identification of MRWA bridge 617.” Mechanics of structures and materials, Bradford, Bridge, and Foster, Eds., Balkema, Rotterdam.
Haritos, N., and Hira, A. (2004). “Repair and strengthening of RC flat slab bridges using CFRPs.” Compos. Struct., 66, 555–562.
Law, S. S., Ward, H. S., Shi, G. B., Chen, R. Z., Waldron, P., and Taylor, C. A. (1995a). “Dynamic assessment of bridge load-carrying capacities. Part I.” J. Struct. Eng., 121(3), 478–487.
Law, S. S. Ward, H. S., Shi, B. B., Chen, R. S., Waldron, P., and Taylor, C. A. (1995b). “Dynamic assessment of bridge load-carrying capacities: Part II.” J. Struct. Eng., 121(3), 488–495.
Ross, S., Boyd, A., Johnson, M., Sexsmith, R., and Banthia, N. (2004). “Potential retrofit methods for concrete channel beam bridges using glass fiber reinforced polymer.” J. Bridge Eng., 9(1), 66–74.
Salawu, O. S., and Williams, C. (1995). “Bridge assessment using forced vibration testing.” J. Struct. Eng., 121(2), 161–172.
Samman, M. M., and Biswas, M. (1994a). “Vibration testing for nondestructive evaluation of bridges. Part I: Theory.” J. Struct. Eng., 120(1), 269–289.
Samman, M. M., and Biswas, M. (1994b). “Vibration testing for nondestructive evaluation of bridges. Part II: Theory.” J. Struct. Eng., 120(1), 290–306.
SAP2000/Nonlinear Users Manual. (2000). Comput. Struct., Berkeley.
Shahrooz, B. M., and Boy, S. (2004). “Retrofit of a three-span slab bridge with fiber reinforced polymer systems—Testing and rating.” J. Compos. Constr., 8(3), 241–247.
Standards Association of Australia (SAA). (1991a). “Methods for tensile testing of metals.” SAA, Sydney, NSW, Australia.
Standards Association of Australia (SAA). (1991b). “Methods of testing concrete—Method 14: Method for securing testing cores from hardened concrete for compressive strength.” SAA, Sydney, NSW, Australia.
Standards Association of Australia (SAA). (1998). “Methods of testing concrete—Method 12: Determination of mass per unit volume of hardened concrete.” SAA, Sydney, NSW, Australia.
Standards Association of Australia (SAA). (2004). “Bridge design—Part 5: Concrete.” SAA, Sydney, NSW, Australia.
West, R. (1973). “Recommendations on the use of grillage analysis for slab and pseudo-slab bridge decks.” Cement and Concrete Association, C&CA/CIRIA, London.
Zanardo, G., Hao, H., and Deeks, A. J. (2004). “Dynamic-based assessment of MRWA bridge no. 3014.” Proc., 18th Australasian Conference on the Mechanics of Structures and Materials, Vol. II, Perth, WA, Australia, 1231–1237.
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© 2006 ASCE.
History
Received: Feb 9, 2005
Accepted: Jul 15, 2005
Published online: Sep 1, 2006
Published in print: Sep 2006
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