| Reactive Powder Concrete (RPC) is a new kind of material with superior mechanical properties, box girder has many advantages, such as high torsional stiffness, high vertical and horizontal stiffness, coordinating with gradually improving prestress technology, the prestressed RPC box girder structure can greatly reduce Dead Weight of Structure, reduce reinforcement distribution, improve the structure durability and prolong the service life. Based on strip-partitioning method, nonlinear analysis program for prestressed RPC box section are programmed with Visual BASIC language, the whole-working history analysis of Prestressed RPC box section is studied. Based on the present design material of box girder, five series of a total 30 kinds of prestressed RPC box section are designed, the whole-working history analysis of these sections are compared. Influence of of various factors on the prestressed RPC box section bearing capacity are studied detailedly, these factors include nonprestressed and prestressed reinforcement ratio, height of web plate, thickness of bottom plate, effective prestress, the ultimate bearing capacity of 24m prestressed RPC girder are analysed with ANSYS. The study results show that the whole-working process of prestressed RPC girder can be divided into three stages: plastic stage before concrete cracking, cracking stage before the yielding of nonprestressed reinforcement and failure stage. The studied factors have different degree impact on the cracking moment, ultimate moment, ultimate curvature, ultimate curvature, ultimate compression strain of upper flange, ultimate compression strain of lower flange and ultimate tensile strain of prestressed reinforcement. |
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