Shallow structures are often required in highway bridges when an underneath clearance is critical. Use of shallow bridges allows to avoiding a more expensive bridge system such as arch or truss bridges. Through-girder bridges are categorized as one type of girder bridges and are more receptive to the majority of the contractors as compared to other sophisticated bridge systems. When conventional concrete is used in through-girder bridges, relatively large and heavy edge girders are necessary because they need to carry all dead and live loads. Recent advancement of ultra-high performance concrete (UHPC) allows to leveraging this exceptional material in various types of structures and results in increased structural capability and performance. The use of UHPC in shallow bridges can reduce the sizes of the structural members or increase the span capacity. This paper addresses a through-girder system that involves the use of UHPC in primary members and connections. It describes various components of a throughgirder system, including the transverse beams, edge girders, and longitudinal and transverse connections. A numerical example is presented to demonstrate the analysis and design of a through-girder bridge. Both high-performance concrete (HPC) and UHPC options are described for comparison purpose. A UHPC through-girder system is expected to facilitate bridge construction due to the reduced girder weight and simplified prestressing and reinforcing details. It also allows to enhancing the structural performance and increasing the service life of the bridges. Structures Congress 2020 Downloaded from ascelibrary.org by 44.224.250.200 on 08/02/20. Copyright ASCE. For personal use only; all rights reserved. Structures Congress 2020 205 © ASCE Moines, Iowa. Wright, K. 2015. Steel Bridge Design Handbook: Selecting the Right Bridge Type. No. FHWA-HIF-16-002-Vol. 5.

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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.