Bridge Structure Damage Identification Based on the Damage
Performance Function
CHEN Dongjun1, 3, LI Tianhua2, PENG Kai3, ZHANG Kejia2, LIN Jieqiong3, BAI Wenying2
(1.School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, P. R. China; 2. Xinjiang Urban
Construction Testing Co., Ltd., Urumchi 830000, Xinjiang, P. R. China; 3. Highway & Bridge Engineering Co., Ltd.,
CSCEC Xinjiang Construction & Engineering (Group)Co., Ltd., Urumchi 830054, Xinjiang, P. R. China)
Abstract：Taking slab bridge as the research object, the finite element models of intact and cracked slabs were established respectively. With various live loads of random running vehicle excitations, the acceleration time-history responses at the measuring points were calculated, and the acceleration time-history was piecewise in the time domain, and spectrum analysis was carried out to get the spectrum. A probabilistic statistical algorithm was developed to deal with the problem of uncertain damage identification. Based on the probabilistic significance of the reduction of the natural frequency after plate damage and the statistical characteristics of the indication frequency under various working conditions, the performance function of plate damage identification was established. The structural damage state was expressed by the damage performance function, and the probability of different structural damage states was calculated. The calculated results agree well with the development trend of structural cracking and crack extension.
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2018, Vol. 37 
