Span Pc Continuous Rigid Frame Bridge Design Parameter Optimization Study

The thesis studies and analyzes parameter design of long span prestressed concrete continuous rigid-frame bridge. On the basis of data collection and analyse, the paper draws lessons from the built bridge and the newest research achievement ,and studies the optimal design theory and method of the continuous rigid-frame bridge with double thin-wall flexible piers which especially adapts to landform and transportation development condition in the western regions.Through numerical analysis of the double thin-wall flexible piers continuous rigid-frame bridge, the paper discusses the design influence of the double thin-wall flexible piers. Based on the nonlinear programming, the paper thinks about elastic displacement of groundwork, from force analysis of the double thin-wall flexible piers continuous rigid-frame bridge, to draw to the method of parameter optimal design method.Directed against the characteristic of variational high box-girder structural force, and numerical analysis of to be built bridge, taking into account construction stabilization and intension, the thesis putts forward optimal formula constructional range of isotropic box-girder thick, girder highness and underside bridge curve.On the basis of the analyse of built continuous rigid-frame bridge ratio of span , according to the concept of engineering economy, while only to think about cost, the paper gains to choice rational ratio of span formula.Considering to the continuous rigid-frame bridge construction characteristic, putting forward the idea of reverse to optimize prestressed steel. According to different construction phases, the paper gets the formual of the cantalever phase, join two section of a bridge phase and the vertical prestressed steel, and works out corresponding program.