The Artificial Calculation And Creep And Shrinkage Analyse Of The Long-span PC Continuous Beam Bridge In Xiangjiang

The creep and shringkage are the inherent time-dependent characteristics of concrete-materials.It has significant influence on the service performance of the prestressed concrete structure, especially the large-scale prestressed concrete bridge.But the mechanics of creep and shringkage is very complicated and many influential factors should be considered.So it is an important and complicated problem to predict the effect of the creep and shringkage on the prestressed concrete bridge accurately.In general consideration, the prediction model and the anab-tical method are two critical factors for accuratebpredicting the effects of the creep and shringkage on the concrete structure.so some research work is carried out in this article.The detailed comparison and commentary on the theoretical principle factors considered, applicability and the fitting precision to the test data of the current prediction models are carried out, basing on generalizing the mechanics and influential factors systematically.One analytical method for shrinkage and creep effect of concrete was studies mainly in this paper. Age-adjusted effective modulus was used to substitute for concrete elastic modular to consider the shrinkage and creep influences of concrete. Combining age-adjusted effective modulus method with finite-element method, finite-element step-by-step analysis method was studied. Different shrinkage and creep model can be used to simulate the shrinkage and creep developing process of long-span prestressed concrete bridges. A two-span prestressed concrete girder is ananazed, with consideration on the effect of non-prestressed steels and without consideration on the effect of non-prestressed steels.Xiangjiang Bridge located in Zhuzhou was used as project sample in the paper. The shrinkage and creep effects for the internal forces and deformations of themain bridge are analyzed by this method . Sensitivity of The shrinkage and creep effects was analyzed , 90days are the best opportunity paving. In addition to, the factors affecting--Relative humidity, loading age, and concrete strength rating for Providing thebasis for the actual project.