| Large span prestressed concrete continuous rigid frame bridge has become a modern bridge construction bridge of choice in playing a very important transportation construction. However, the use of such a bridge is found, they all have different levels across the problem of excessive deflection. This problem has affected the traffic bridge comfort, serious potential security risks. On the causes of this problem has become very important. This is the solution to the problem of the existing bridge, but also for continuous rigid frame bridge clear the way for future development. This article relies on practical engineering sub-floor bridge pepper, it was Midas software ANSYS two-dimensional modeling and three-dimensional modeling software. Through these two models over the next torsion problem may be the causes of the stress analysis. Respectively, shear, creep and shrinkage, stiffness, loss of prestress, load and other factors that may affect the model simulation and analysis. Analysis by simple shear on the deflection effect is small, can be neglected. Shrinkage and creep of the design taken into account. The impact of load can be well controlled, and will not be great. Deflection of the main beam over main reasons for the decline in stiffness and prestress losses. Loss of prestress which is slightly larger.. |
