Research On Method Of The Aircraft Taxiway Bridge's Vibration Damage Identification

An accurate mathematical model is the basis of important large bridge's structureanalysis, but it is almost impossible to establish a finite element model which has accordancewith the testing results that only rely on the engineer's experience. To do more deeplyresearch on structure, it must revise the finite element model with the modal test result toestablish the baseline finite element model, this model can be the baseline of complexdynamic response analysis (such as seismic analysis, wind-resistant stability analysis,train-bridgevibrationanalysis andso on),anditis also indispensableforhealthmonitoringofthe bridge and the state assessment. By selecting the taxiway bridge in capital airport as theresearch object, this paper finished the following research work by many research methods,such as structure dynamic optimization design, numerical analysis method and experimenttestingandsoon.1. Basing on the field dynamic test of the real bridge under the environment vibration,the dynamic parameters are recognized by parameter recognition method, and the field testdynamic property parameters of the bridge are obtained. The optimization method aiming atthe field test result was put forward to revise the finite element model. Usingthis method, wecan use the dynamic response directlyto revise the original finite element model which basedonthedesignpaper.2. Selecting the 5th taxiway bridge in Capital Airport as object, and the bridge dynamictest result as target, the optimization method was used to revise the finite element model ofthe 5th taxiway bridge, and the baseline finite element model of the taxiway bridge wasestablished.3. Introducing the"deterioration"element to simulate the damage degree of the 5thtaxiway bridge, by reducing the modulus of elasticity in designated areas of the taxiwaybridge theory finite element model, the structure damage in this location was simulated. Itshowsthattherevisetechnologyoffiniteelementbasedonoptimizationmethodisfeasiblebyrevisingthefiniteelementmodelof"damage"model.