The Application Of The Variable Weight Synthetic Assessment Method For Condition Evaluation Of Beam Bridge

Bridge structure has a crucial function in transportation, the better bridge normal state isto protect transportation unobstructed conditions. The dissertation depicts the background,research status and the common evaluation approaches of bridge state evaluation, establishesthe comprehensive beam bridge structure assess setup based on AHP appraise of variableweight, predicts the state of the bridge for the next few years according to data accumulated inprevious years.In this paper, it adjusts the weights of bridge components slightly according tothe specification, it is better reflect the true state of the bridge normal use after changes inweight, propose reasonable conservation and service of the bridge.In this thesis, for example motorway concrete beam bridge, it have explored the variableweight synthesized assess which built on analytic hierarchy process (AHP), and haveestablished multi-level model of state assessment of the beam bridge condition, thedissertation have segmented into the following elements:a. comment foremost circumscription, content and process of beam bridgeevaluation,summarizes the old bridge status evaluation means;b. explains this basic mathematical principles and judgment built on the AHP, by expertsrights of collecting literature for each index, establishments of index to decide the matrix onthe foundation of the experts rights and calculates the results as the initial weights; details theoverall theory of variable weight and the cause of the balancing function, think ɑ representinjury tolerance of detected by the bridge, when the weight of the large members severelydamage, it can take0.5,when the weight member is smaller when serious damage it cantake0.2,when structural members subjected to less damage it can take1.0;c. using gray state theory, predicts the bridge status evaluation of working, and draws thedegradation function curves, With the extension of the use of time of the bridge operationalstatus of the bridge is in a downward trend, it demands accumulation observation data, andestablish a reasonable conservation and service measures; different bridges take differentvalues of ɑ and it can conduct bridge condition assessment and state forecasts.