Damage Idengtification And Work Performance Evaluation Of High-Speed Railway Bridges Based On Dynamic Response

As high-speed railway develops rapidly,it calls for fully qualified bridges to carry fast-moving trains,however,it is difficult for us to detect the bridge's performance changes as well as to identify the structure damages,both of which are important for engineers to manage the bridges correctly.Otherwise than what's mentioned above,it is also critical to establish a efficient system which is capable to evaluate the bridge work performance.The thesis recalls the development history of high-speed railwayfirstly,then it tips some main characters of high-speed railway bridges.Followingly,it gives a simple introduction to the theories about optimizing the sensor spots.The thesis take the Da shengguan bridge in NanJing as background,and it recalls the structure damage identification methods by he numbers.Basing on the recallings,some basic and sensitive dynamic factors,such as nature frequency,stiffness,deformation and so on are figure out to try out work performance evaluation index.With adequate studying about in and abroad related works and the help of statistic tools,a new method is proposed which is supposed to be able to identify the structure damages and evaluate the work performance in levels according to the sensitive dynamic responses.This method is verified to be efficient and sensitive to identify the structure damages and evaluate the unitary work performance in simulation analysis with finite element method.