Research On Structural Performance Monitoring Technology And State Evaluation Of Flexible Tied Arch Bridge

Bridge construction entered its climax in the 1990 s,and the bridges built at that time have been in service for decades.If the damaged bridge structure cannot be repaired in time,not only will the traffic be affected,but the service life of the bridge will be greatly shortened,and even more serious damage to the bridge structure will result.The horizontal thrust of the flexible tie arch is completely balanced by the flexible tie rod.Once the horizontal thrust is not balanced,it will cause a huge change in the internal force of the structure.Through the bridge health monitoring system of the Beijing-Hangzhou Canal Bridge,the static and dynamic response of the bridge structure is calculated and analyzed.The influence of the tie of the flexible tied arch bridge on the bridge structure is explored.The optimal arrangement of the sensor is analyzed and the safety of the structure is evaluated by means of research.The flexible tie-bar arch bridge provides a research reference.The paper first establishes the Midas finite element model of the Beijing-Hangzhou Canal Bridge for static and dynamic analysis.Then the structure of the flexible tie rod is briefly described,the cause of the loss of the flexible tie rod is analyzed,and the protection measures of the tie rod are studied.The reliability analysis of flexible tied arch bridge members is carried out by JC method.The reliability of flexible tie arch bridge system is analyzed by PNET method.The influence of different tie rod force loss ratio on the safety of structural system is clarified,and the tie force test scheme is proposed.Then based on the modal confidence criterion,the gradual elimination method is used to optimize the layout of the sensor,and the design and composition of the health monitoring system of the BeijingHangzhou Canal Bridge are elaborated.Finally,using the analytic hierarchy process and the variable weight synthesis theory,the evaluation model of flexible tied arch bridge is established,and the state evaluation method of flexible tied arch bridge is studied.