Study On Evaluation Index System For The Long Span Continuous Rigid Frame Bridge

Along with the development of our country highway network constuuction,in view of thecontinuous rigid frame bridge has good seismic performance of structure,largestiffness,driving smooth and comfortable,operation management is convenient wait for acharacteristic,a bridge to overcome the big rivers and wide deep canyon demandincreasing,has become the main bridge across the loess gully terrain in some regions.But building these bridges for survey and design and construction technologyrequirements quite high,if in the design,construction and operation management on small,willresult in this kind of bridge in operation a few years will appear girder downwarping is toolarge,the box girder cracks and durability quickly reduce diseases.For long-span continuousrigid frame bridge is service,how to accurately and effectively evaluate is particularlyimportant,so for the future operation maintenance management provide powerful sciencebasis.In order to enrich the connotation of assessment of long span cintinuous rigidframe,reducing some blindness in the evaluation work,in this paper,based on along-spancontinuous rigid frame bridge characteristics of its evaluation index system was studieda,themain research contents and results:(1)introduces the development of long-span continuous rigid frame bridge at home andabroad and operating condition,introduces the research on bridge assessment index systemboth at home and abroad and the research achievements, according to the experts and scholarsat home and abroad achievements,summarizes the problems existing in the current evaluationindex system, the system elaborated the commonly used method of bridge assessment.(2)briefly introduce methods in the assessment of existing Bridges,mainly introduces theanalytic hierarchy process application in bridge evaluation index system.Based on a largenumber of remote monitoring data and plant disease detection data analysis,established thelong-span continuous rigid frame bridge service state evaluation index and evaluationhierarchical model.(3) Research has established the evaluation index system of long-span prestressedconcrete continuous rigid-frame bridge expert survey method is used to determine the index weights. At the same time, based on the analytic hierarchy process, the calculation model wasestablished based on finite element analysis software Midas civil, study section in theunderlying index weight calculation method of stress, deflection measuring point and on afew load combination under the extreme value of each monitoring section structureevaluation matrix, MATLAB is used to calculate the matrix eigenvalue and eigenvectorcalculated weight of measuring points and the index weight value is more reasonable.(4) Taking a long-span continuous rigid frame bridge as engineering example, verifythe established index system has stronger applicability and reliability of evaluation result isconsistent with the bridge actual working status, show that the constructed index system inbridge assessment study has certain practical application value.