Internal Forces Analysis Of Shrinkage And Creep For Continuous Rigid Frame Bridge

With the rapid development of transportation, our country has made great progress in bridge construction. Lots of long-span bridges have been built, especially prestressed concrete continuous bridges and composite beam bridges.The analysis of concrete shrinkage and creep is the basic issue of bridge structure analysis. There have been a few methods for calculating the shrinkage and creep, however almost every method is on the basis of experiment and research, meanwhile, each method has the limits for application.The paper is mainly about the shrinkage and creep secondary internal force analysis of long-span continuous rigid frame bridges. And it contains: mechanism of shrinkage and creep, factors affecting the shrinkage and creep, influence of shrinkage and creep on structure appearance, calculating theory of shrinkage and creep. The shrinkage and creep of concrete are affected by lots of factors, such as breed of cement, water cement ratio, dosage of cement, moisture content, skeletal materials, curing condition, additives, structural dimensions, environmental temperature. Forecasting and controlling of shrinkage and creep are considerable complex problems, so does their influence on structure performance, both of which are difficult to have exact answers. And these issues contain some uncertain factors.After the explanation of the theory of shrinkage and creep, a further analysis on an example is followed. Through the comparison of the results of two models and the measured value, an efficient method for dealing with long-span continuous rigid frame bridges can be gotten.