Bridge Test Assessment Method Based On The Theory Of Reliability

Structure reliability theory in bridge engineering, was first widely used in structural design, before it was introduced to the assessment of the bridge. There are many ways to bridge assessment, method based on reliability theory can to a certain extent overcome the assessment of the evaluation of subjective factors from personnel, and can therefore more reflect the bridge structure are in operation condition, is a relatively new bridge assessment method.This paper tries to use a method, which based on the structure reliability theory, to reinforced concrete girder bridge for safety assessment work, the thesis mainly content as follows:(1) It introduces the basic theory of the structure reliability and the corresponding structural components and structure of the system reliability calculation method, and introduces the basic concept of the time dependent reliability.(2) Because the influence factors of structure resistance is very complex, one can’t consider, and limited to the depth study, this paper only consider general atmospheric conditions, the strength of concrete, steel corrosion of steel and concrete strength as well as the synergy of work to the influence of the resistance coefficient of structure. Reference relevant literature, in view of the reinforced concrete girder bridge with this particular structure, establish the structure resistance and the load effect change probability model.(3) Using probability estimate network technology, a reinforced concrete girder bridge of the reliability evaluation work, given the reliability analysis of the specific calculation process. Consider our country highway traffic overload serious situation, in live load calculation introduced overload coefficient, given the overload coefficients on the structural reliability index curve of influence.(4) Given the choice different failure modes of related coefficient set limit, structure reliable indicator of the change rule, and the influence factors of structure reliability index a preliminary analysis, it is concluded that the relevant conclusions and suggestions.