Open Journal Systems

Modal response identification of a highway bridge under traffic loads using frequency domain decomposition (FDD)

Mehmet Akköse, Hugo C. Gomez, Maria Q. Feng


DOI: https://doi.org/10.20528/cjsmec.2017.03.009

Abstract


In this study, a four-span, 224m long, post-tensioned concrete box girder bridge supported on single column piers was subject to a series of controlled vehicle tests. Bridge acceleration response datasets were used to study the effect of truck speed and a sudden stop, on the modal identification of the bridge structure. Natural frequencies and mode shapes of the bridge were determined using the frequency domain decomposition technique for all datasets. The passing of the truck rendered difficult to identify the first bridge frequency. Conversely, the vehicle tests improved the identification of higher vibration modes. This is because the truck preferentially excites the bridge vertical response, which is associated with higher modes of vibrations, especially when a sudden stop of the vehicle occurs. Thus, carefully conducted vehicle-crossing tests provide detailed information about the bridge structure dynamics in the vertical direction. However, to identify lower modes, no vehicle on the bridge is preferred.


Keywords


box girder bridge; modal identification; frequency domain decomposition; traffic loads

Full Text:

PDF

References


Billing JR (1984). Dynamic loading and testing of bridges in Ontario. Canadian Journal of Civil Engineering, 11(4), 833-843.

Brady SP, O'Brien EJ, Žnidarič A (2006). Effect of vehicle velocity on the dynamic amplification of a vehicle crossing a simply supported bridge. Journal of Bridge Engineering, 11(2), 241-249.

Brincker R, Zhang L, Andersen P (2000). Modal identification from ambient response using frequency domain decomposition. Proceedings of the 18th International Modal Analysis Conference (IMAC18), Society for Experimental Mechanics, San Antonio, TX, USA, 625-630.

Cantieni R (1983). Dynamic load tests on highway bridges in Switzerland. Rep. No. 211, Eidgenossische Material-prufungs-und Versuchsantalt (EMPA), Dubendorf, Switzerland.

Chen Y, Feng MQ, Tan CA (2006). Modeling of traffic excitation for system identification of bridge structures, Computer‐Aided Civil and Infrastructure Engineering, 21(1), 57-66.

Feng MQ, Kim DK, Yi J-H, Chen Y (2004). Baseline models for bridge performance monitoring, Journal of Engineering Mechanics, 130(5), 562-569.

Gomez HC (2011). System identification of highway bridges using long-term vibration monitoring data, Ph.D. thesis, University of California, Irvine, USA.

Gomez HC, Fanning PJ, Feng MQ, Lee S (2011). Testing and long-term monitoring of a curved concrete box girder bridge, Engineering Structures, 33(10), 2861-2869.

Huang D (2008). Dynamic loading of curved steel box girder bridges due to moving vehicles. Structural Engineering International, 18(4), 365-372.

Kim CY, Jung DS, Kim NS, Kwon DS, Feng MQ (2003). Effect of vehicle weight on natural frequencies of bridges measured from traffic-induced vibration. Earthquake Engineering and Engineering Vibration, 2(1), 109-115.

Kim S, Sokolik A, Nowak A (1996). Measurement of truck load on bridges in Detroit, Michigan, area. Transportation Research Record: Journal of the Transportation Research Board, 1541(1), 58-63.

Senthilvasan J, Thambiratnam DP, Brameld GH (2002). Dynamic response of a curved bridge under moving truck load. Engineering Structures, 24(10), 1283-1293.


Refbacks

  • There are currently no refbacks.