Analysis Of Shear Performance Of The Mixed Arrangement Of Internal Prestressing And External Prestressing Of Prestressed Concrete Box Girder

This dissertation’s topic originates from Jiangsu Province Traffic Scientific ResearchProject(Item Number:09Y012).This paper is researching about the shearing perforcement of the segmental mixed arrangment ofinternal prestressing and external prestressing box girder beam through shearing failure test of3testbeams, and draws the oblique section shear bearing capacity formula of internal prestressing andexternal prestressing box girder beam, analyses the mechanical performance using the finite elementanalysis software. The main research contents and conclusions are as follows:(1) By the shearing failure test, this paper researches the failure form and crack developmentprocess of the mixed arrangment of internal prestressing and external prestressing box girder beam, atthe same time analyses the mechanical characteristics of members based on the previous relevant testreaserch results, points out that the segmental box girder beam has good ductility and obvious failuresymptom, also explains that the beam’s final failure form closely related to the arrangment ofprestressed reinforcement and the development of diagonal crack and other factors.(2) Based on the results of box girder beam’s shearing failure test and other existing relevant testresults, with the parameters that reflecting segmental construction and arrangment of prestressedreinforcement, this paper analyses the factors which influence the shearing strength of segmental boxgirder beam and draws the oblique section shear bearing capacity formula of segmental mixedarrangment of internal prestressing and external prestressing box girder beam.(3) This paper analyses the mechnical performance at linear-elastic work stage of the mixedarrangment of internal prestressing and external prestressing box girder beam using general finiteelement analysis software-ANSYS, discusses the thoughts and methods of modeling mixedarrangment of internal prestressing and external prestressing box girder beam through analysis, studysthe mechnical performance of mixed arrangment of internal prestressing and external prestressing boxgirder beam through different ways of mixed arrangment of prestressed reinforcement.