Research On Damage Location Of Continuous Rigid Frame Bridge Based On Damage Performance Function

As the hub of traffic engineering,bridges bear the important significance of economic development and convenient service.However,in real life,there are factors such as overload operation and environmental corrosion.The structure may be damaged at any time,and serious accidents may occur.Based on the dynamic test.Damage identification method is widely used because of its economical and non-influence of normal traffic operation.The damage identification method based on natural frequency variation has attracted the attention of many researchers.In this paper,a scale model bridge is taken as the research object.From the theoretical research and experimental research as the starting point,through the understanding of the localized characteristics of the dynamic response spectrum,combined with the structural knowledge of structural dynamics,probability statistics and structural damage identification,The damage identification method of damage performance function is carried out,and the theoretical basis and method based on the damage performance function are studied.The dynamic damage identification test based on the identification method is completed,and the following work is completed:(1)Based on the research content of this paper,the related literatures at domestic and overseas are collected and summarized,and the current situation of structural damage identification research is summarized and summarized,which provides literature support for the later research.(2)The theoretical research on the identification method based on damage performance function is carried out.The theoretical basis of the method is proposed and the concept of pointer frequency is proposed.The finite element model is established to test the theoretical basis.(3)The finite element model of the model bridge is established.The random running vehicle excitation is simulated by the multiply pulse excitation load method,and the acceleration signal is obtained.The data is processed to verify the feasibility of the finite element model.(4)Clean up the outside of the model,the experimental design scheme is completed,the arrangement of the acceleration sensor is optimized,and the random running vehicle excitation of the model bridge was carried out for each working condition,and the correctness of the actual model bridge and the finite element model was verified.The dynamic characteristics of the structure were explored.(5)Collect and process acceleration signals to build performance functions,and perform damage location identification on structures.