Prestressed Concrete Beams, The Ultimate Bearing Capacity Of The Nonlinear Finite Element Analysis

In the past 50 years, especially after reform and open, many various type of highway bridges railroad bridges . highway- railroad dual purpose bridges urban bridges and overpass etc. had been built in our country. For those old bridges, throughout the long time use, there are inevitably some flaw or damage produced in the bridge structure, some may be already very serious; Moreover for those bridges set up lately, we need to assess the loading capacity, the design and the construction quality of the bridges, consequently confirm the credibility of the engineering. Both sides require us to make an accurate analysis for the loading capacity of the bridge structure, but the design method of current criterion can't satisfy this request obviously, so wo have to lucubrate for this demand.This paper on the basis of consulting many domestic and overseas research production, aimed at studying prestressed reinfored concrete beam extensively applied at present. For the sake of analyzing the rationality of the result of theoretical calculation, a T shape prestressed concrete beam model was designed and a untimate bearing capacity experiment was processed. Ansys, a finite element program, was used and the prestressed concrete beam was modeled by means of separated entity to analyze the beam's whole process of stress and deformation from loading to destruction. Whereas the error was produced by the linear elastic method introduced by criterion, this paper compared various concrete constitutive equations and selected the formula recommended by the domestic concrete criterion of architectural industry. According to actual parameters, nonlinear finite element analysis was performed, and the result was compared with those of experiment and criterion, at the same time error was analyzed. Finally paper educed the ultimate bearing capacity of the model beam as full prestressing concrete component, partial prestressing concrete A type component and partial prestressing concrete B type component. Through the analysis of this paper, we profoundly comprehended the ultimate bearing capacity of prestressed reinfored concrete component.