The Evaluation And Upgrade Of The Bridges Of Jianghan Sea-route Net

The bridges are pivotal stronghold of the whole road.It becomes more and more popluar that some existing bridges betray multifarious structure damage and the limitations below the anticipative functions inevitably by reason of structure aging or vehicle load increasing or adverse environment or maintenance deficiency.lt results in not only the local bottleneck of the line and hidden trouble to the passing vehicle if the defective bridges are not duly maintained and reinforced.As a result,the bridge evaluation is specially important to the maintenance and strengthening.Futhermore,we can not demolish and rebuild only but adop corresponding measures according ad temporal condition when the bridges are deemed to have defectiveness.So it accords with the situation of a country that the reinforcement and other upgrade measures aim at the bridge attention.The paper contains two segments:static and dynamic detection,evaluation and alteration.Static monitoring contains apparent and load detection.The model of multi-layer fuzzy evaluation and the bridge using capability grade membership function are used in the appraisal of the bridge technical condition of the highroad criterion technic and maintenance ,and then the data and excel of the bridge compontents.The bridge grade membership function can be deduced from the factor theory domain.grade theory domain and the bridge using capacity grade membership function,then by baseding the connection of weigh and factor judgement matrix and judging gradually,finally the bridge comprehensive evaluation synthetical judging grade will be figured out. The actual bridge evaluation criterion are combined with fuzzy evaluation organically.The technical condition of breges are classified by carving up super safety degree in static detection.The super safety degree and relevant technical condition grade are ascertained by compareing the numerical value of static detection with that of apparent detection.Pulsant test and vibration models dvaluation are discussed in dynamic detection.Pulsant test mainly expounds pulsant experiment,transitting test,bounce test,braking examination.lt is judged by the cell damage index whether carving up cell comes to harm.Three factors of carrying capacity,shippmg,traffic flux are considered among alteration and upgrade.Carrying capacity upgrade aims at simply-supported girder bridge and arc bridge(truss bridge and double arch bridge)of sea-route nets.To navigation,headroom chiefly is required,secondlythe jacking-up technique and economical analysis are given attention to two or morethings.The simply-supported grider bridge and mono-arch bridge are touched upon in navigation upgrade.