Based On Curvature Modality Relevant Of The Bridge Damage Identification Research

Traffic is a country economic blood, and a bridge is a traffic throat in the country traffic system, so it's important to make sure every bridge's function and safety, as well we must often test or monitor to bridges' safety to make sure the bridges are safety. So the structure'damage identification become a new problem to the engineers in the process of the bridges' test or monitor.The bridge damage identification technology's research already had several dozens year history, in this process, had already made the substantial progress based on the static state as well as the dynamic damage identification engineering research. But an important question lies in carries on the damage identification the dynamic parameter great variety, how to guarantee that the parameter the change correct response structure real damage condition is the question which urgently awaits to be solved, this needs to use the science reasonable computational method and the damage identification parameter unifies, reduces the dynamic parameter through the computational method randomness, manifests regularity fully, thus enhances the data and makes the correct judgment regarding the structure damage sensitivity.First, in this article elaborates in the process, proposed take the structure vibration's time modality curvature as the damage identification parameter, unifies the gray related association theory and the modality curvature, the structure various nodes curvature modality relevant coefficient's change rule carries on the structure damage through the use structure damage around the theory method.Next, introduced the modality curvature carries on the bridge damage identification in the bridge damage identification's utilization and the curvature modality the theory basis, and introduced in detail how unifies the pessimistic relevant theory and the curvature modality carries on the bridge structure the damage identification.Finally respectively take the gird beam and continuously beam as the example, use large-scale space finite element procedure ANSYS10.0 calculates the gird beam and continuously beam under each operating mode time the structure vibration vertical displacement, and calculates structure various nodes the vibration modality curvature, at the same time, proposes according to this article based on the curvature modality relevant damage identification theory, use large-scale mathematical computation procedure MATLAB 7.0 compiles the computational procedure, calculates around the structure damage the relevant coefficient, has carried on the damage localization appraisal to the structure damage position, and with has carried on the contrast based on the curvature difference damage identification methods' computed result.According to the example result's, causes the power damage identification based on the curvature modality relevant damage identification technology from beforehand"the one-stage process"enhances"the multi-steps", thus enhanced the structure vibration parameter greatly regarding the damage sensitive degree, causes the damage identification result to have the reliability.