A new method for the identification of a stationary random load moving on bridge structure

The stationary random load moving on bridge structure is identified based on the fact that the effect of this load is the same as that of a fixed non-stationary random load with known modulated function. Firstly, the idea of pseudo excitation method was introduced into the identification of pseudo generalized coordinate from pseudo displacement response with the technique of eigenvalue and singular value decomposition, which avoided the matrix inversion and accordingly improved the identification precision. Then the stationary random load spectra was decided from the pseudo generalized coordinate spectra by using the Wiener-Khintchine relation and Duhamel integration. Numerical results show that, with a good choice of the number of mode and the response measuring position, the method presented here can identify the stationary random load moving on bridge structure effectively.