Static And Construction Analysis Of Long-span Prestressed Concrete Cable-stayed Bridge

The cable-stayed bridge is an indeterminate structure with high degrees and the structure analysis of the cable-stayed bridge is very complicated. The construction method is closely related to the internal forces and deformation of the bridge. During the course of construction, in order to keep the bridge safe and the deformation of the bridge reasonable, the construction control of large-span prestressed concrete cable-stayed bridges become an important research subject. The accurate model should be constructed and the effective structural analysis method should be taken to analyze and study the structural behavior in the construction stage and service stage of cable-stayed bridges. The thesis, taking the Changshou Bridge in ChongQing as the example, studies the static analysis of the cable-stayed bridge and proposes tower and beam synchronous construction methods.Determining the reasonable design state is the precondition of the design and computing of the cable-stayed bridge. Firstly, the reasonable design state of Changshou Bridge is determined by the minimum bending energy method, and some unreasonable cable forces are optimized and adjusted. Then the thesis studies the structure behaviors under the action of the permanent load, live load, temperature load and so on. The stress of the structure under the most disadvantageous combination is computed.And then, the thesis studies the different construction methods. Tower and beam synchronous construction method is the less used method which has obvious advantages in contrast to the conventional popular method: shorten the construction period, cost savings, and great economic. This thesis use forward-iteration method to compute the initial cable force in construction process which constructed by tower and beam synchronous construction. The method has good computing speed and less time without flip chip approach. That proves forward-iteration method is effective method to solve the initial cable force in construction process using tower and beam synchronous construction technology.