Impact Factor Analysis For The Long-term Excessive Deflection Of Long-span Continuous Rigid-frame Bridge

With Chinese economic development, Long-span continuous rigid-frame bridge iswidely used in the construction of the bridge. However, Long-span continuousrigid-frame bridge widespread scratch a big problem-the long-termdeflection.Analyzing the main factors of Long-term deflection is particularlyimportant. By analyzing the main factors of Long-term deflection and expoundingtheir mechanism of action，this paper concludes the influence of the different initialinternal force of the bridge models state on the long-term deflection, and works outthe elements of long-term deflection by using the method of Parametric analysis.1.This article first proposed two major influencing factors on the long-termdeflection,Shrinkage and creep、prestress loss.Based on two basic concepts andcalculation methods,described the mechanism of action of the two main factorsaffecting the long-termdeflection.2.Analyzing the initial internal force of five different span continuous rigid-framebridge.Analyzing and comparisoning the internal force of the maximum cantileverand bridge、the birdge deflection、the long-term deflection.Initially been therelationship between the initial internal force and the long-term deflection.3.According to the contrast of the parameters which influence Long-term deflectionby using the method of sensitivity，this essay analyses the parameters whichinfluence Long-term deflection of Long-span continuous rigid-frame bridge. Thereare mainly four parameters will be discussed, and they are the relative humidity、initial prestressing force、the friction coefficient of the prestressed reinforcement andthe pipe wall and the loading age. Combining with the initial internal force analysis,the degree of the factors that affect the long-term deflection will be concluded.