Beam Bridge Structure Damage Identification Research Based On The Dynamic Characteristics Of Structure

Since the1970s, the bridge-construction-project has achieved great successthrough the world. Many complex, large-scale bridges are built into our society.Bridges, the throat of a country or region’s transportation network, its safety anddurability are particularly important. Our country has a large number of bridges.However, due to the design, construction, overloading, natural erosion and otherreasons, many existing bridges have different degrees of damage, such as aging,damage, cracks, etc. To ensure that these bridges have sufficient security to continueto be used, we need to monitor and assess the damage state of the bridge structure,thus we can do maintenance of the bridge structure, the corresponding reinforcementof this process is the bridge health monitoring and structural damage identification.The core of bridge health monitoring system is the identification of structuraldamage, structural damage is actually that the properties of structural dynamic(natural frequencies, mode shapes, etc.) has changed, so we can analyze the dynamiccharacteristics of the structure parameters, in order to determine the location andextent of structural damage. This article focuses on the natural frequency of thebeam structure and we take fingerprint analysis to take research on structural damagelocalization issues.Above all, The paper give an overview of structural damage identification,describe the basic method of structural damage identification in detail and givecomparative analysis of the static test and dynamic test identification method.Secondly, The paper introduce many methods of beam bridge structure dynamicdamage identification, create three injury frequency fingerprint recognition based onmethods, namely frequency change ratio, rate of change frequency change squareratio and regularized frequency change rate, comparing the accuracy of these threefingerprints damage identification, found that regularized frequency change rate hasthe best monotonic, and has a better structural damage localization effects. Furtherdiscussing fingerprint frequency stability, and the effect of injury unit width of thebeam frequency fingerprint; Finally, take the beam structure for example, point out that the principles and procedures of frequency fingerprint damage location, and takemodel validation, indicating regularized fingerprints injury frequency rate hasrelatively high positioning accuracy, but we should mention that the frequencyfingerprint does not locate the structure of the symmetrical position.Then, given the theoretical analysis of the error of damage identificationmethod based on dynamic characteristics of the emerging, discussing the dynamictest error, model error and the existing error of numerical algorithms. And describethree methods to reduce the impact of the error analysis for error sources.Finally, The paper give the introduction of the bridge health monitoring system,discuss the relationship between the composition of health monitoring systems andstructural damage identification, highlight the views and prospects for thedevelopment of optimal sensor disposed in health monitoring system.