Spectral Localization Characteristics And Damage Identification Of Dynamic Response Of Bridhe Under Driving Excitation

Any structural damage will appear disease or sudden injury under the long-term of using,and bridge as the hub of transportation engineering plays an important role,so the bridge structure health monitoring and safe use attaches social and engineering great importance.Based on the laboratory scale model bridge as the research object,starting from the theoretical research and experiment,based on the bridge structure by the vehicle under random excitation spectrum presents the characteristics of localization features,in bridge structure vibration frequency as the research key,on the basis of structural dynamics,structure modal theory,probability theory and mathematical statistics knowledge and structural health monitoring and damage such as theoretical foundation of the bridge health monitoring and structural damage identification are studied,and completed the following work.(1)studied the structural damage identification research status at home and abroad and generalizations.(2)analyzed the bridge structure inspired by the driving frequency system of localization features in theory and experiment research,this kind of structure vibration spectrum localization features can provide theoretical basis for bridge structure damage identification for us.(3)based on the frequency of the bridge structure damage identification theory and combining the structure of spectrum localization effect bridge structure damage identification method is proposed.(4)based on the indoor laboratory scale model bridge for the indoor model test,completed the test scheme design,processing,data acquisition and processing system development model,impulse test,dynamic test,etc.(5)based on the indoor model test random stimulation on structure analyzed the influence of the measured frequency.(6)On the basis of indoor model test,identified the structural damage.