Research About Lateral Displacement And Torsional Distortion Of P.C. Continuous Curved Box Girder

To the curved girder bridge's "creeping" phenomenon that some experts put forward in resent years, this dissertation makes a systematical research about lateral and torsional distortion of P.C. continuous curved box girder bridge which is relied on National point engineering-Shiyezhou Interchage of Runyang Yangtze River Highway Bridge. In this paper, Some curved girder bridges' disease and accident that is reported were enumerated, two kinds representative curved girder bridge were analyzed with space finite element method, the appearing process of curved girder bridge's creeping was analyzed too, and the preventive measure has been adavanced finally.The results shows: the curved girder bridge's "creeping" phenomenon performed as the lateral displacement superficially, but in fact, it also include the torsional distortion; the bearing's transverse reaction and vertical reaction are the key factors of cruved girder bridge's "creeping". "Creeping" phenomenon easily appeared in P.C. continuous curved box girder bridge relied to the structure form: because of the beam's curvature radius, the deadweight and prestress force caused the curved box girder's torsional distortion, added the actions of the temperature grads and vehicle, the outward torsional distortion turn worse, some time caused some inside bearings' appear negative vertical reaction. At the same time, with the effect of prestress force,changes of temperature and driving of vehicle, curved beam appears lateral displacement, bearing bears transverse reactions. As the bearing's form hasn't been considered enough, curved box girder may move and turn out outwardly.