Development of a precast prestressed concrete through-girder system for shallow bridge structures

摘要

This paper proposes an innovative precast through-girder system that can be used in shallow bridge structures. It discusses various components of the through-girder system, including the edge (through) girders, transverse beams, and longitudinal and transverse connections. The through girders are made of precast concrete box beam segments that are spliced longitudinally through posttensioning. The precast prestressed transverse beams span between the through-girders involving the use of transverse posttensioning. An important feature of this system is to implement ultra-high performance concrete (UHPC) at the all joints. The use of UHPC allows to minimizing the joint width and achieving superior durability. A numerical example is presented to demonstrate the analysis and design of the through-girder bridge superstructure accounting for both high-performance concrete (HPC) and UHPC options. The UHPC superstructure option can reduce the sizes of the structural members and allow to enhancing the structural performance.