A Study Of Several Key Question In Design And Construct Of Prestressed Concrete Continuous Box Girder

Now cantilever construction of prestressed concrete continuous box girder as the chief construct methord in engineering has gone intio the rang of mature.But this species bridges from design to construction have some question and their solve method still ambiguous.The test associate actural condition of one construction monitor item and use specialized software of bridge and finite element programming Ansys researched three focus question.First, research the systerm of temporary restrain in engineering and present the proper scheme.Second, strudy the origin of oblique crack on web plate and present the corresponding solve methord.specially, in order to prevent the hazard crack on web plate ,reseached focus factor how to properly set longitudinal and vertical prestressed link.Third ,present a new idea of use U form prestressed link in web plate to solve the puzzled question of force and keep vertical prestrssing.Through theoretical calculation approved this idea is credible and feasible plan in engineering.