Abstract：A revised model updating method based on the frequency response function (FRF) signature assurance criterion is proposed, by which the damage indexes of different parts can be identified, and furthermore the damage of the simply-supported beam can be quantitatively evaluated. Four simply-supported model steel beams were fabricated and damage was simulated by cutting the sections. The dynamic responses of the model beams were tested and damage identification was conducted by the proposed method. The numerical simulation and the model test results of simply-supported steel beams with different damage indicate that when the signature assurance criterion (SAC) indexes of frequency response functions between adjacent points are used to construct the objective functions, the number of identification parameters can be greatly increased. The frequency response function is sensitive to the frequency band between the first-order and the second-order dominant frequencies, so it can be used in the calculation of SAC indexes and the damage evaluation of simply-supported beams. The proposed damage evaluation method is insensitive to systematic test errors and noises, by which both single damage and multiple damages of the bridge can be simultaneously localized and identified. When the number of transducers is limited, the step-by-step method can be used to approach the true damage locations and identify the damage extents precisely.
战家旺 李明 卢洋 闫宇智 . 基于模型修正理论和频响函数模式置信准则的简支梁损伤动力评估方法[J]. 土木工程学报, 2017, 50(8): 49-58.
Zhan Jiawang Li Ming Lu Yang Yan Yuzhi. Dynamic evaluation method for damage of simply-supported beams based on model updating theory and FRF signature assurance criterion. 土木工程学报, 2017, 50(8): 49-58.
