Mechanical Analysis Of The Construction Process Of Corrugated Steel Web PC Box Girder Of Continuous Rigid Frame Bridge

Concrete box girder bridge with corrugated steel webs is a new concrete-steel structure type, it makes full use of the material advantages of concrete and corrugated steel. The Enyanghe Bridge is a typical concrete box girder bridge with corrugated steel webs. The paper uses the Enyanghe Bridge as the engineering background and analyses its construction process analysis. The main job of the paper are:The construction control contents and calculation methods of corrugated steel webs of continuous rigid frame bridge are summarized. The corrugated steel webs of continuous rigid frame bridge is under complicated stress. It is difficult to use the analytical method to analysis the construction control and the finite element method must be used. In this paper, Enyang River Bridge as engineering background, the finite element method of construction control are analyzed and summarized.The construction process was analyzed by software ANSYS. Finite element model of the bridge with corrugated steel webs must be established. First the general situation of Enyang River Bridge and the method to use ANSYS to establish the finite element model of the bridge were mainly introduced. The specific steps to establish the model were:the floor body building, diaphragm, the roof body building, prestressed reinforcement location, steel webs, meshing, establishment of cross half symmetric finite element model. Finally, the 2# pier T constitutive model was built. And in the appendix the model Enyang River Bridge command flow was attached to the paper.Linear and stress were analysed by ANSYS. Analysis of construction process of Enyang River Bridge, the results showed that in the construction process of 2# pier and 0# block with parts of the stress state was safe compression. In each stage of construction, the web site appeared with the roof and the stress concentration phenomenon, which was a normal phenomenon. Analysis of the displacement of each section in the construction process in pouring concreteand prestressed after two conditions. Results showed that the cantilever several segments smaller deflection. But with the increase of beam placement, deflection was becoming larger. From the deflection change trend, the slope deflection change became larger. After tensioned, displacement of beam section is changed. The first few sections of the displacement and upward to downward displacement larger than that generated when pouring concrete. With the increase of beam section, upward displacement increased, the maximum upward displacement occurs in the 6# segment. Start number of tensioned steel reduced from the 6# block, so that the beam warping displacement small. Before the 6# block tensioning prestressed steel beam, the beam position was higher than the design elevation. But in the pouring 7# block after the displacement of the beam was shifted to interference, less than the design elevation. In the maximum cantilever construction process of the end beam downward displacement was 9.11mm.