Abstract：A dynamic evaluation method for damage evaluation of hinged joints in fabricated slab-girder bridge using frequency response function (FRF) and model updating theory is proposed. The integral average stiffness of hinged joints is taken as the identification variable, the correlation indexes of FRFs (COFRF) between adjacent girders is used to construct the objective function, based on which the model updating method is improved and optimized for localization and quantitative identification of hinged-joint damage at different locations. A numerical simulation example is given, in which the influence of some factors, including the damage degree, number and locations of damaged joints, locations of impact load, locations of measurement points and the noise on the damage identification results, is analyzed. The analysis results show that multiple hinged-joint damage with different degrees can be identified simultaneously by the proposed method with good anti-noise ability and good calculation efficiency. Locations of impact load and measurement points have little influence on the identification results. A fabricated slab-girder bridge was tested before and after renovation. The evaluation results agree well with the actual damage, which proves the reliability and effectiveness of the proposed method from the view of practical application.
