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《Journal of The China Railway Society》 2003-04
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Application of wavelet analysis in identification of moving loads on a bridge

HUANG Lin1,YUAN Xiangrong2(1School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China;2Engineering College, Shantou University, Shantou 515063, China)  
In this paper,we use the wavelet analysis technique and cubic spline function to fit the displacement response. And we get the velocity and acceleration response based on the curvefitting result. Finally, we find the loadtime curves from the formulas of moving loads identification according to response based on the finite element vibration equtaion of bridge and the modal superposition principle. Using the wavelet analysis to decompose the identification results into low and high frequency loads in the time domain, we find that the results of axles weight and loads induced by vertical motion are well in line with real loads and errors accur mainly loads induced by pitch motion. Further study shows that the false pitch motion is the essential problem to cause errors. So we point out that eliminating the influence of the false pitch motion will be the effective way to improve the accuracy of the identification results. This is the very valuable identification method as shown by emulation calculation of computers.
【CateGory Index】: U441.2
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