5Zhu X Q, Law S S. Damage detection in concrete bridge structures under moving vehicular loads [ J ]. Journal of Vibration and Acoustics, 2007, 129( 1 ) : 58 -65.
6Lu Z R, Liu J K, Huang M, et al. Identification of local damages in coupled beam systems from measured dynamic responses [ J ]. Journal of Sound and Vibration, 2009, 326: 177 - 189.