The Influence's Research For Deflection Control Of Bridge Construction Considering Concrete Creep

The bridge is a kind of complicacy spatial structure, especially PC Bridge. The deflection's control is very important during the cantilever's construction. But the re-distribution of strain and inner force causing by creep caused difficulty to the deflection control. The occurrence of the concrete creep can be regarded as concrete "accept defeat" for the force. However not only the force influence concrete's creep, but also many agents such as certain agent, nonlinear agent, latent agent, and with some interact agents such as prepare stress's infliction and its loss. The deflection's computation is complicacy when considered the agents included concrete creep. So we should compare the calculation results with design date before construction to find the problem.We should continually adjust the elevation date in construction control to reduce the error. In redundancy structure, the structure's distortion and strain will change along with time because of creep. According to the characteristic of concrete's creep, the creep grows quickly in the concrete' earlier age. For the long of bridge's construction period, the concrete's age of different part are discrepantly. So it is necessary to analyze concrete's creep in construction course.To make the structural analysis approach true condition, it is best to simulate the bridge structure to air space composite structure form, so it can offer instruction for construction. Modern calculating machine and developing of software system make the big computation possible. For supervising and controlling of the deflection of construction, we may use the date get from the test and practicality to have computation analysis with FEM. It proof that this device is more direct to validate. Based on the time effect theory of creep and combined the test and the actual construction circumstance, the paper may be helpful to construction for it is analyzed and simulated by FEM.