Research On Bridge Damage Identification Method Based On Data Driven

Nowadays,With the growth of social economy,The quantity of all kinds of bridges has increased,at the same time,the accident rate of bridges has also increased.,Bridge Health Monitoring has occupied a major position.Therefore,More and more researchers from over the world all has conducted comprehensive and in-depth research on the damage mechanism of bridges and SHM methods.However,this bridge detection method is difficult to achieve accurate judgments of structural health in practice,and the impact of the environment is more significant.According to existing research results,among the many factors that affect the damage identification of bridge structures,the influence of temperature changes on the structural health diagnosis plays a leading role.In this regard,this paper proposes a data-driven method to identify structural damage under the influence of temperature.This part systematically analyzes the following contents:In the first place,it mainly explains the research significance and background of the thesis,and Research Status of this subject.Then the theory of structural damage identification and the principle of principal component analysis are introduced in detail.Second,in order to verify this method,this paper builds a simply supported beam model to verify the feasibility of the method and a steel truss model to verify the wide applicability of the method.above all,I choose to use two damage indicators,From the two damage indicators,the one with better results is selected as a parameter and substituted into the PCA method.The results confirmed the feasibility of this method in numerical simulation.Then,based on structural damage theory and finite element theory,the simply supported beam was tested for dynamic characteristics,and a complete experimental plan was formulated.The calculation and analysis of the experimental test results verified the method based on principal component analysis.The feasibility of damage identification in practical applications.Finally,summarize the work content of this paper,and put forward prospects for the limitations of this method.