Application Of Inverse Problem Of The Reliability Basing On One Slab Bridge

Bridge as a guarantee highways unimpeded WuGong structure, the development of the cause of the traffic plays a more and more important role and influence region and national economic development speed. Due to long-term exposure to the bridge structure in atmospheric environment by different kinds of external attacks in different degree, causing damage to the bridge, such as not promptly to its regular testing, time prediction and maintenance will left hidden trouble, causing unavoidable casualties and economic loss, this is very dangerous. Say so regular inspection of bridge monitor and maintain particularly important, but the remaining time forecast is of equal importance.This paper first introduces bridge remaining residual life prediction research development, also introduces several reliability and reliability calculation method for the inverse problem of after the reliability of the inverse problem, provides the theory basis for the calculation.The role in bridge structure can be as random variables load for bridge structures reliability analysis has very good targeted(Including: the bridge itself constant load, live load and accidental load ). Based on consulting various domestic and international related material, and on the basis of introducing constant load respectively form and live load form two roles, including constant load form types according to the normal distribution; While live load for logarithmic distribution, form which is divided into normal operation and probability distributions and intensive operation probability distribution two kinds of circumstances, establish its use respectively; the maximum probability distribution during And calculates the actual operation of the maximum probability distribution.Bridge structure durability limit state equation force as the goal, USES several load characteristics and Bridges, and according to the form as a means of time limit state equation of parameters, the list is resistance limit state equation, applied reliability theory calculate the inverse problem of the remaining time bridge structure. Using the reliability index structure security rating and reliability inverse problem theory of bridge structure, concluded that its service life prediction of residual lifetime. In this paper, a 15 years active duty hollow bridge site of the comprehensive test, according to on-site testing and static and dynamic load test results of technical condition rating, then last use of structural reliability theory about the inverse problem structure to predict the remaining service life , for the destruction of the future structure of the bridge provides a time basis, to ensure the normal use of bridge in time for safety and reliability.In this paper,a service operation 15 years of hollow slab bridge structure resistance calculation and get the structure reliability index and technical condition rating, finally, using the structure reliability inverse problem of this structure theory predict remaining service life, for the future of the bridge structure destroy provided a time basis, ensure bridges in normal use time in the safe and reliable.