Study On Damage Identification Method Of Bridge Structure

In the course of service,the coupling effect of environmental erosion,material aging and load effects,artificial or natural catastrophe effects will inevitably lead to the cumulative damage and resistance attenuation of bridge structures,thus reducing the ability to resist natural disasters,normal loads and bad conditions.Cause a catastrophic accident.The timely monitoring of the health status of bridge structure and maintenance of bridge structure early damage can not only reduce the maintenance cost significantly,but also guarantee the structural performance of the bridge and prolong the life of the bridge structure.Therefore,the study of effective damage identification has important social and economic value.For the above reasons,bridge structure damage detection has been a hot topic in recent decades,and many scholars have done research in this area.The damage detection of bridge structure can be based on visual inspection,local damage detection based on instrument equipment,structural damage detection based on static measurement data and structural damage detection based on dynamic measurement data.They have their own characteristics and are suitable for different engineering practice.In this paper,several methods of bridge damage detection are introduced.The advantages and disadvantages of each method are summarized.Then the damage detection method of bridge structure damage detection which is mainly discussed in this paper is studied deeply based on the damage detection of vibration type curvature change,and the structural damage detection method based on static measurement data is studied.The two methods are compared,the static and dynamic combination is combined and complementary.The specific contents are as follows:(1)the damage identification method based on the change of mode shape curvature and the structural damage identification method based on static measurement data are analyzed and studied.(2)The finite element software Midas Civil is used for modeling and analysis of a steel truss bridge.First of all,the first five modes of vibration data of the bridge structure are obtained.Then the vibration shape curvature is obtained by the calculation formula,then the mode curvature of each type of damage is compared in order to achieve the damage detection.Then the modal curvature mode difference is obtained to make the damage result more intuitive.By using the static displacement analysis method,different forces are applied to the bridge structure,and the deflection values of each damage condition under different loading forces are studied in order to achieve the purpose of damage identification.(3)The model of the steel truss bridge is established,and the damage identification experiment is carried out by the static related damage identification method.The concrete experimental method is carried out strictly according to the recognition steps.(4)The recognition results of finite element simulation and solid model experiments are compared and analyzed.Finally,the problems that should be paid attention to in the process of simulation and experiment are summarized,and the realization method of the damage simulation in the process of finite element simulation and solid model experiment is analyzed,and the influence of the simulation method on the simulation results in the implementation process is also analyzed.