Test Research Into The P.C. Continuous Curved Box Girder Bridge

Curved girder bridge has many differences against straight bridge in the structure character because of the coupled effect of bending and torsion. The prestress steel cable's linetype of curved box girder bridge is three dimensional curve,which makes curved girder bridge's force-bearing capability more complicated. Consequently, to study curved girder bridge, it's necessary to have practical tests besides the simplex theoretical analysis.To further study P.C. continuous curved box girder bridge's structure character, this dissertation makes a test research on P.C. continuous curved box girder bridge, relied on National point engineering-Shiyezhou Interchange of Runyang Yangtze River Highway Bridge. Two parts exist: upside structure test and bearing reaction test research. In the first part, the influence of dead load and prestress on displacement and deformation of curved girder bridge is discussed; moreover, the girder's stress and displacement in different construction stages are practically observed, in order to monitor the security during constructing the curved girder bridge. In the second part, various factors influencing vertical bearing reaction of P.C. continuous curved box girder bridge are discussed, and test scheme is introduced; furthermore, the variation of girder's bearing reaction, and the dangerous situation occurred or not of support deviating or box girder overturning, are long-time observed.The contrast between test values and finite unit method calculated values, has verified the feasibility of analyzing curved girder bridge with finite unit method. Test results obtain the security monitor effect,and there are no negative vertical bearing reactions, which show no overturn of curved box girder bridge.It's suggested that more attention should be paid when allocating prestress cable in curved box girder bridge, and some methods should be used to balance the vertical bearing reaction of curved box girder esp. the end of the girder.