Identification of Modal Properties of Bridges
Publication: Journal of Structural Engineering
Volume 116, Issue 7
Abstract
Modal stiffness and damping are determined from experimental test data for a single‐span laboratory bridge model and a full‐scale three‐span highway bridge. Steady‐state vibration tests are conducted on both structures using an electro‐hydraulic actuator. Accelerations are recorded at selected locations on the structures. For the laboratory model, the modal properties are calculated from experimental data for the as‐built model and after one flange is cut. Modal properties for the highway bridge are determined during a 40,000‐cycle fatigue test of the in situ structure. Changes in stiffness and mode shapes are related to the observed deterioration of the structures. Mode shapes are the best indicators of the deterioration.
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References
1.
Abdel‐Ghaffar, A. M., and Housner, G. W. (1978). “Ambient vibration tests of a suspension bridge.” J. Engrg. Mech. Div., ASCE, 104(10), 983–1000.
2.
Baganoff, F., and Baganoff, D. (1968). “Crack detection in a structural beam through cross‐correlation analysis.” Shock and Vibration Bulletin, 1 (Aug.), 91–95.
3.
Bakht, B., and Csagly, P. F. (1980). “Diagnostic testing of a bridge.” J. Struct. Div., ASCE, 106(7), 1515–1530.
4.
Baldwin, J. W., Salane, H. J., and Duffield, R. C. (1978). “Fatigue test of a three‐span composite highway bridge.” Final Rept. 73‐1, Missouri Highway Res. Program, Jun., Columbia, Mo.
5.
Barr, R. (1987). “Keeping bridges in repair is problem across U.S.” St. Louis Post‐Dispatch, 109(11), Apr., 20.
6.
Baruch, M. (1980). “Proportional optimal orthogonalization of measured modes.” AIAA J., 18(7), 859–861.
7.
Douglas, B., and Reid, W. H. (1982). “Dynamic tests and system identification of bridges.” J. Struct. Div., ASCE, 108(10), 2295–2312.
8.
Hart, G. C., and Yar, J. T. P. (1977). “System identification in structural dynamics.” J. Engrg. Mech. Div., ASCE, 103(12), 1089–1104.
9.
Morgan, B. J., and Desterle, R. G. (1985). “On site modal analysis—A new powerful inspection technique.” Proc. 2nd Int. Bridge Conf., Pittsburgh, Pa., Jun., 17.
10.
Raimer, J. H., and Pernici, G. (1979). “Dynamic testing of a modern concrete bridge.” Canadian J. Civ. Engrg., 6(3).
11.
Rainer, J. H., and VanSelst, A. (1976). “Dynamic properties of Lions' Gate suspension bridge.” Proc., Specialty Conf. on Dynamic Response of Struct., ASCE/EMD, Los Angeles, Calif., Mar.
12.
Reed, R. E., and Cole, H. A. (1976). “Randomdec: Mathematical background and application to detection of structural deterioration in bridges.” Report FHWA‐RD‐76‐181, FHWA.
13.
Rubin, S. (1980). “Ambient vibration survey of offshore platform.” J. Engrg. Mech. Div., ASCE, 106(6), 425–442.
14.
Salane, H. J., et al. (1971). “An investigation of the behavior of a three‐span composite highway bridge.” Final Rept. 71‐5, Missouri Highway Res. Program, Nov., Colombia, Mo.
15.
Standard specifications for highway bridges. (1976). American Assoc. of State Highway and Transp. Officials, Washington, D.C.
16.
Targoff, W. P. (1976). “Orthogonality check and correction of measured modes.” AIAA J., 14(2), 164–167.
Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 116 • Issue 7 • July 1990
Pages: 2008 - 2021
Copyright
Copyright © 1990 ASCE.
History
Published online: Jul 1, 1990
Published in print: Jul 1990
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