How to Attain Full Continuity and Standardization in Composite Prestressed Multi-Beam Bridges


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Title: How to Attain Full Continuity and Standardization in Composite Prestressed Multi-Beam Bridges

Author(s): K. MiratalaeiI

Publication: Special Publication

Volume: 128


Appears on pages(s): 941-956

Keywords: beams (supports); bridge decks; bridges (structures); concrete construction; continuity (structural); flanges; precast concrete; prestressed concrete; shear properties; Structural Research

Date: 11/1/1991

A detailed investigation was made to study the shear transfer between precast prestressed beams and in situ concrete in a relatively new method of construction of continuous bridge decks where the ends of precast beams are connected to an integral in situ crosshead away from the supports. The main advantages of this method are: Increasing the span length, standardization of the beams, elimination of the deep support girder, obtaining full continuity for the dead and live loads, and possibility for using straight beams in skew and curved bridges. The prestressed beam used in the investigation was an inverted T-section, and it was concluded that: 1) The shear force is transferred from a small length at the end of the beam. 2) The in situ concrete nibs can take this shear force without stirrups. 3) There is no need either to project all the bars into the in situ concrete or to prestress the connection transversely. 4) The shape of top flanges of the prestressed beam had a significant effect on the shear transfer capacity of the connection. 5) For the beams without top flanges, the shear strength of the connection can be modified by using transverse prestressing, web shear connectors, or projection of the bars.