A damage identification method of beam bridges based on multi-source influence line information fusion
For damage identification and performance evaluation of beam bridges,the data at a single measuring point will result in poor robustness and accuracy of identification results.To ad-dress this problem,a new damage identification method based on the information fusion of a multi-source influence line was proposed and verified by an actual steel-concrete composite beam bridge.The curvature differences of the influence lines of deflection,strain,rotation angle,and support reaction force were constructed.Then,based on the D-S evidence theory,the multi-source influence line information was fused,and a fusion index that could be used for damage identification of beam bridge structures was proposed by introducing Euclidean distance weigh-ting.Finally,the fusion indexes containing four kinds of data were obtained by taking the model example,and the effects of measuring point location,damage degree,and noise level on the dam-age diagnosis results were discussed.The results show that the damage identification method based on the fusion of multi-source influence line information is more accurate than the traditional method.The damage identification model with the combination of angle,support reaction force,and strain information is obviously superior to other fusion modes,and still has good noise robustness under 10％noise interference.
beam bridgemulti-source influence lineD-S evidence theoryinformation fusiondamage identificationfusion model
万方数据
维普
