Study On Construction Control Of Four-Span Prestressed Concrete Continuous Rigid Frame Bridge

With the rapid development of transport, the demand of bridge construction is increasing. Continuous rigid frame bridge is applied widely because of its long-span ability, convenient construction, simple conservation. In generally, long span prestressed concrete continuous rigid frame bridges usually are erected with the cantilever construction techniques. During construction process, the girder line shape and the internal forces of the bridge are difficult to be consistent with the design requirements owing to a lot of problems. In order to make the bridge in smooth and safe construction and the real state meet the design requirements,it is necessary to make the bridge construction in control.First of all, the thesis expounds the continuous rigid frame bridge’s construction control theory and the structural analysis methods. Taking the Pengan Jialing River Bridge II as an example, and using the professional design software Midas Civil to simulate the construction process of this bridge, the theorical data such as the displacement and the internal force in each construction stage in according with the work of construction control are studied. And the details of the construction control, the simulation of the camber setting and the optimization of the template elevation determation are also discussed.Then sensitivity analysis of some parameters of Pengan Jialing River Bridge II is researched in this thesis. The author analyses how the structure weight, elastic modulus of concrete, prestressed parameters, shrinkage and creep of concrete and the temperature influence the displacement, the internal force and the stress of the bridge.At last, in order to simulate conveniently, the simulation analysis of the continuous rigid frame bridge usually neglects the effect of the spile foundation when simulating the thrust force with the finite element method. Then the thesis simulates the spile foundation in the model and studys the spile foundation’s influence to the simulation results of the closure thrust force, and analyses the effect of the closure thrust force.