Research On The Health Condition Assessment Method Of Long Span Concrete Cable-stayed Bridge During Operation Period

According to incomplete statistics,from 2000 to 2012 report of bridge accidents,the bridge of the operation period accounted for 67%of the samples of bridge accidents.That is to say,we should pay more attention to the bridge in the operation period when we pay attention to the bridge safety.In the course of operation,with the increase of the age,the natural factors such as climate,environment,and the increasing traffic volume and the number of heavy trucks and heavy vehicles,the degradation of bridge structure will occur.Therefore,it is necessary to evaluate the health of the bridge during operation.In this paper,the health assessment of long-span concrete cable-stayed bridge is studied,the main contents are as follows:(1)The theory and calculation method of the AHP hierarchy analysis method is described,and the first layer index of the health state evaluation of large span concrete cable stayed bridge is established.The first layer is used to calculate the internal force state of the appearance and the internal force.(2)The method of gray correlation degree theory and the theory of variable weight are expounded.The internal force state of the large span concrete cable-stayed bridge is evaluated by the grey relation degree theory and the variable weight theory.(3)In the condition of the appearance of the cable-stayed bridge,the paper expounds the method of the H21-2011 JTGT highway bridge technical condition evaluation standard.The bridge is divided into three parts:the upper structure,the lower structure,the bridge deck system defect,and the defect index of each part is detailed.(4)Based on the static index of the large span concrete cable-stayed bridge,the internal force state assessment method,through the establishment of internal force state assessment index,calculate the weight of each index,and then the weight of the composite,and finally get the internal force state assessment method of large span concrete cable stayed bridge.(5)The health assessment of Jingzhou Changjiang River Highway Bridge is carried out.