Analysis of Reasonable Constraint Conditions for Span by Span Assembly Construction of Concrete Segmental Box Girder
Compared with traditional cast-in-place concrete box girders,precast assembled concrete segmental box girders have the advantages of fast construction speed,good construction quality,and minimal impact on the surrounding environment and existing traffic.In recent years,they have been widely used.Concrete segmental box girders are often constructed using an integrated bridge erecting machine for span by span assembly.During the assembly process,the different consolidation and prestressed sequences of temporary pier beams will result in different structural constraints.The article explores the effects of 5 possible construction constraints on the stress of a prestressed concrete segmental box girder using a span by span assembly construction and a basic span combination of 3 × 32 m,and identifies reasonable constraints.And it is proposed that during the construction process of concrete segmental box girders,construction should be strictly carried out in accordance with the design constraints,so that the actual stress state of the beam body is consistent with the design,ensuring structural safety.
bridge prefabrication & assemblysegmental box girderstep by step assemblyconstraint conditionsfinite element analysis
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