| Nowadays, the long-span prestressed concrete continuous rigid frame bridge has been builded on a large scale in China. However, due to the problem about the down deflection and the cracks of box girder, the prestressing tendon design of the long-span continuous rigid frame brige has also been payed much attention.This thesis has studied the theory and method of the prestressing tendon design of long-span continuous rigid frme bridge, and discussed the design method and the key problems of longitudinal prestressing tendons, transverse prestressing tendons, and vertical prestressing reinforcement. Then with the help of the finite element calculation and analysis software Midas/Civil, this thesis has also realized the calculation and analysis of a long-span prestressed concrete continuous rigid frame bridge which has the span arrangement of 68m+120m+68m by building the computational model.This thesis has analyzed the longitudinal prestressing tendon design method by the straight line style of the continuous rigid frame bridge, pointed out the problems of this kind of method, and then compared and analyzed the rationality of other method for the prestressing tendon design. To the problems of the down deflection and the box girder's cracks of the continuous rigid frame bridge, this thesis has discussed the improvement of the prestress design. Finally, this thesis has discussed the process and method to build the computational model by the finite element calculation and analysis software Midas/Civil for the long-span prestressed concrete continuous rigid frame bridge, realized the design, calculation and analysis of the total structure of long-span prestressed concrete continuous rigid frame bridge, and then concluded the prestessing tendons' arrangement form and material dosage. Besides, this thesis has also explained the application in the part of checking calculation for the prestressed reinforced concrete railway bridge by Midas/Civil. |
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