Preliminary Research On Mechanical Behavior Of Extradosed Cable-Stayed Bridge With Corrugated Steel Webs

No matter structure or the prestress system PC composite bridge with corrugated steel webs has its originality, its suitable bridge structural style is also very extensive, supporting beam, continuous beam and continuous rigid frame, then to the partial cable-stayed bridge cable-stayed bridge, with a strong adaptability. At present, this kind of bridge including all structures has developed rapidly abroad. In recent years, this structure type of bridge has obtained rapid development and application in China. However, PC composite box-girder bridges with corrugated steel webs under construction and have been built are mainly supporting beam, continuous beam and continuous rigid frame. Extradosed cable-stayed bridge and cable-stayed bridge with corrugated steel webs have not appeared yet, their mechanical characteristics have not been clear. Though domestic scholars have conduct researches on it, because of lack of the technical data basically is at the basic research stage. Therefore, this paper, takes the main span180m extradosed cable-stayed bridge with corrugated steel webs as the object of study, by numerical simulation, study static, dynamic and local stress characteristics respectively.First, MIDAS Civil is used to build extradosed cable-stayed bridge with corrugated steel webs model, through two kinds of structure comparative analysis, study the influence of girder prestressed effect, temperature load, the shrinkage and creep of concrete to the extradosed cable-stayed bridge with corrugated steel webs structure.Second, in order to know the dynamic characteristics of extradosed cable-stayed bridge with corrugated steel webs structure, separately build extradosed cable-stayed bridge with corrugated steel webs and PC composite bridge with corrugated steel webs dynamic model, and has carried on eigenvalue analysis and seismic time-history response analysis. Through the comparison of two models, the author analyses the mechanical characteristics of two structures under different seismic time-history.Last, for pier-girder consolidation area of extradosed cable-stayed bridge with corrugated steel webs, use ANSYS to build partial finite element model, analyze corrugated steel webs distribution of shear stress with straight, oblique webs, shearing force distribution of corrugated steel web plate and concrete roof and floor, and shearing stress distribution of with or without lining concrete as well as overall model and partial model same position stress comparative analysis.