Research Of Serving Condition AHP Evaluation Method Of Long-span Concrete Cable-Stayed Bridge

With the design trend of complication,the bridge accidents happing,the enormous investment and significance in national economy make people pay more attention to the safety, durability and normal functions of these bridges. Structure serving condition monitoring systems and intelligent control technologies have been introduced into these long span bridge and are developing rapidly. At the same time, it becomes a key point that how to exactly valuate the work state of the bridge and put forward the maintaining strategy in time.Regarding the features of long span prestressed concrete (PC) cable-stayed bridges, aftersummarizing bridge health monitoring and condition assessment theory all over the world, with Fengjie Yangtze River Bridge as background, index system of bridge condition evaluation based on AHP wasintroduced and a multi-layer assessment model was proposed then. Finally, the algorithm wasprogrammed based on Matlab, and it provided an academic method on condition assessment of longspan PC cable-stayed bridge. At the same time, it established a model of spatial finite element according to the physics characteristic and material parameter of the Fengjie Yangtze River plan, and analyzed the dynamic properties of this cable-stayed bridge. It made use of the damage guideline which people of the past put forward to carry on the numeric damage analysis towards the Fengjie Yangtze River Bridge.In this paper, according to the features of long span PC cable-stayed bridge, based on using elementary ideas of the latest theories with the combination of extensive achievements of bridge condition assessment end the other correlative domains, the assessment model was established using analytic hierarch process and variable weight synthesizing for the Serving Condition Monitoring and Assessment System of Fengjie Bridge, which evaluated PC cable-stayed bridge's condition in service by grading items in bottom level of assessment model. The study work of this paper is to provide a set of economical, practical and effective project for the establishment of the Serving Condition Monitoring and Assessment System of the Fengjie Yangtze River Bridge, and provided an example for the development and application of the Serving Condition Monitoring and Assessment System.