A state-of-the-art review of prestressed concrete tub girders for bridge structures

Abstract

This paper presents a state-of-the-art review of prestressed concrete tub girders for bridge structures, which are a resilient solution to reduce the occurrence probability of disruptive events and to extend the longevity of built-environments. Technical parameters are categorized in accordance with physical characteristics and corresponding contents are examined. Unlike the case of box girders, the open-section tub girders demand secondary structural elements to improve stability. As far as application is concerned, pre- and post-tensioning methods are taken into account with a focus on the implications of geometric variables, on-site splice, and applied forces. The applicability of existing design provisions is also evaluated in the context of live load distributions and end zone cracking. While the strand size of 12.7 mm and 15.2 mm is dominant in the United States, research has commenced on the use of 17.8 mm strands to accommodate a high level of prestressing force. The effectiveness of precast decking panels is elaborated against conventional cast-in-place decks, and the extension of overhangs is delineated.

Cost Optimization of Prestressed U-Shaped Simply Supported Girder Using Box Complex Method

“…Furthermore, due to economic considerations, state Departments of Transportation (DOTs) have shown a preference for reducing the number of girders. Consequently, the U-shaped prestressed girder has emerged as a viable alternative in this context [14]. The U-shaped viaduct has many advantages, such as the level of rail, which can be reduced due to the distance between the bottom of the flange and the rail, which results in savings in the foundation and station design.…”