Analysis And Evaluation Of Health Status In Wuhan,yangtze River Bridge

Railway bridges,like other large structures,have a life cycle from built-up use to performance degradation to destruction or demise.With the increase of train speed and environmental corrosion,aging of materials,structural damage and degradation of performance are accelerated.In the process of service of bridge structures,accidents caused by structural damage and damage occur from time to time.In order to reduce the occurrence of bridge accidents,it is particularly important to conduct long-term real-time health monitoring of bridges.Realizing the real-time health monitoring and assessment of the bridge,timely detecting the damage of the bridge and repairing it in time,it is of great engineering significance to ensure that the bridge maintains a good operating state and avoids accidents.Wuhan Yangtze River Bridge,as an important bridge for China’s highway and railway roads,is a landmark project in the history of bridge construction in China.Since 2008,the Wuhan Railway Bureau commissioned Prof.Su Mubiao from Shijiazhuang Tiedao University to establish a long-term health monitoring system for the bridge and obtained a large number of monitoring data of the structure’s response to provide a comprehensive and systematic safety assessment for the Wuhan Yangtze River Bridge.Necessary conditions.Since the Wuhan Yangtze River Bridge was opened to traffic,the bridge piers have been hit several times,causing damage to the bridge to varying degrees.Therefore,it is necessary to evaluate the current health status of the Wuhan Yangtze River Bridge.Based on the existing bridge design and testing technical specifications,the data and statistical analysis results of the long-term monitoring of the Wuhan Yangtze River Bridge(including the past test data and analysis results of the bridge)and the response of the bridge using the finite element simulation bridge for mechanical behavior analysis Comparing the results of the calculations,a comprehensive assessment of the health status of the bridge structure was conducted and the following conclusions were obtained:(1)Under the temperature load,the calculated value of the beam end displacement change is very close to the measured value(the error is about 3 mm),and in the process of spring,summer,autumn and winter continuous alternation,the change law is relatively consistent,the whole year The position is basically the same,indicating that the displacement of the beam end is normal with the temperature change;(2)Under the action of train load,the theoretical and measured values of the response of beam end displacement,mid-span deflection,and longitudinal and transverse beam strain of the railway are relatively close to each other,and the measured data are all less than under the "middle-live load" effect.The value of each response of the bridge structure;(3)The changes in the response data of the bridge structure during the operation are all within the normal range.The Wuhan Yangtze River Bridge has a good state of health and can guarantee the safe operation of the train at an unlimited speed.(4)According to the previous bridge inspection results and routine inspection results,so far,the main structure of the bridge has not been significantly damaged,and the structural performance has not been significantly degraded,which can guarantee the current and future operation safety in a certain period.