AUTHORS: J. D. Yau, W. F. Chen, S. Urushadze
Download as PDF
ABSTRACT: In conventional bridge health monitoring, a number of sensors are deployed on a bridge directly for detecting its various dynamic properties. This is so called “direct method”. But the drawbacks of the direct method are: laborious deployment of sensors, time-consuming, and not portable. Following the previous Yang’s works (2004) in indirect method by using a passing test vehicle as a message receiver of bridge response, this study regards cross winds as lateral excitational sources to detect the lateral bridge frequencies from the lateral response of the moving test vehicle. To account for the wind-vehicle-bridge interactions in performing dynamic analysis, an iteration-based 3D vehicle-bridge interaction (VBI) finite element method is developed. The whole wind/VBI system is decomposed into two subsystems: the windbridge subsystem and the wind-vehicle subsystem. Then the iterative scheme is carried out to compute the interaction response between the two subsystems independently and iterate for removing unbalance forces. The numerical results indicated that the present indirect bridge monitoring is a simple and feasible method to measure the lateral frequency of a long-span bridge in cross winds.
KEYWORDS: aerodynamics, frequency, indirect measurement, vehicle-bridge system, wind engineering
REFERENCES:
[1] Baker C.J. (1986) A simplified analysis of various types of wind-induced road vehicle accidents, J. Wind Eng. Ind. Aerodyn., 22, 69–85.
[2] Cai, C.S., Chen, S.R. (2004). Framework of vehicle– bridge–wind dynamic analysis, J. Wind Eng. and Ind. Aerodyn. 92, 579-607.
[3] Ernst, J.H. (1965), Der E-modul von seilen unter Berucksichtigung des durchhanges, Bauingenieur 40 (2) 52–55.
[4] Simiu, E., Scanlan, R.H. (1996), Wind Effects on Structures-Fundamentals and Applications to Design, 3rd Ed., John Wiely & Sons, Inc., New York.
[5] Xu, Y.L., Xia, H., Yan, Q.S. (2003), Dynamic response of long suspension bridge to high wind and running train. ASCE J. Bridge Eng. 8, 46-55.
[6] Xu, Y.L., Zhang, N., Xia, H.(2004)Vibration of coupled train and cable-stayed bridge systems in cross winds, Eng. Struct. 26, 1389–1406.
[7] Yang, Y.B., Lin, C.W., and Yau, J.D. (2004). Extracting bridge frequencies from the dynamic response of a passing vehicle, J. Sound and Vib., 272(3-5): 471–493.
[8] Yang, Y.B. and Lin, C.W. (2005). Vehicle-bridge interaction dynamics and potential applications, J. Sound and Vib., 284(1-2): 205–226.
[9] Yang, Y.B., and Chang, K.C. (2009). Extraction of bridge frequencies from the dynamic response of a passing vehicle enhanced by the EMD technique, J. Sound and Vib., 322(4-5): 718–739.
[10]Yang, Y.B., Li, Y.C., and Chang, K.C. (2012). Using two connected vehicles to measure the frequencies of bridges with rough surface: a theoretical study, Acta Mech., 223(8): 1851–1861.
[11]Yang, Y.B., Chang, K.C., and Li, Y.C. (2013a). Filtering techniques for extracting bridge frequencies from a test vehicle moving over the bridge, Eng. Struct., 48: 353–362.
[12]Yang, Y.B., Chen, W.F., Yu, H.W., and Chan, C.S. (2013b). Experimental study of a hand-drawn cart for measuring the bridge frequencies, Eng. Struct., 57: 222–231.
[13]Yang, Y.B., Cheng, M.C., and Chang, K.C. (2013c). Frequency variation in vehicle-bridge interaction systems, Intl. J. Struct. Stab. Dyna., 13(2), 1350019.
[14]Yang, Y.B., Li, Y.C., and Chang, K.C. (2014). Constructing the mode shapes of a bridge from a passing vehicle: a theoretical study, Smart Struct. Syst., 13(5): 797–819.
[15]Yau, J.D. and Kuo, S.R. (2014), Study on interaction aerodynamics of vehicle-bridge system under wind actions, 12th International Conference on Fluid Mechanics & Aerodynamics (FMA '14), Dec.29-31, Geneva, Switzerland.
