Study Of Prestressed Concrete Muti-Span Curved Box-Girders Bridge

It is the wide application of P.C. continuous curved box-girder bridge which has become an important bridge style in the transportation infrastructure.First of all, this paper expatiated the basic theory of the curved bridge and deduced the procedure of the calculation (such as thin-walled structure theory of Volasov's, plane curved girder differential equation and arc differential equation about force-strain), and also explained the theoretic foundation and development of the finite element analysis technology which is a structure analysis method beingused widely now. Then by means of a practical interchange project, the paper carriedout a great deal of calculation and comparison to the main influence factors of the curved bridge by ANSYS program and changing parameter. In this paper, it was also discussed principally, such as curvature factor, bearing eccentricity, uniform alteration of temperature, setting of anti-torsion support and tendon tensioning order. Furthermore the analysis and the conclusion were given about displacement and internal force for continuous curved box-girders in this paper.It is especially that, in the paper, the bearing eccentricity has been approached in detail and the viewpoint has been brought forward, that is to say the moment when all external forces which is attributed to center of circle is zero, the internal force of main girder will be reasonable.