Trial design of a super-long span longitudinal prestressed UHPC box girder bridge

Author(s): Minghong Qiu, Xudong Shao, Rensheng Pan, Zhijie Yang
Paper category: Proceedings
Book title: 1st International Conference on UHPC Materials and Structures
Editor(s): Caijun Shi and Dehui Wang
ISBN: 978-2-35158-164-3
e-ISBN: 978-2-35158-165-O
Publisher: RILEM Publications SARL
Publication year: 2016
Pages: 538-544
Total Pages: 07
Language: English

Abstract: The conventional long-span prestressed concrete box-girder (PCBG) bridges are subjected to two types of premature deteriorations: cracks and excessive long-term deflection, which reduce the serviceability and durability of bridges. To address the above issues, an innovative longitudinal prestressed UHPC box-girder (LPUBG) bridge was proposed based on the superior mechanical properties of ultra-high performance concrete (UHPC). In this paper, the experimental studies of the top slab done by the research group are introduced and a trail design of the novel LPUBG is presented to explore its feasibility. The current studies indicate that: (1) attributed to densely distributed diaphragms, the top slab of the LPUBG behaves as a bidirectional load transferring component with the larger bending transferred in the longitudinal direction and remains in the linear elastic domain even when the nominal tensile stress reaches11.5 MPa; (2) the weight of the superstructure and substructure of LPUBG bridge scheme is only 45% and 30% of that in traditional PCBG bridges, respectively, resulting in an overall cost reduction by 9%. The LPUBG bridge is thus a competitive alternative for long-span bridges with the main span length up to 200 m ~300 m.

Online publication: 2016
Publication type : full_text
Public price (Euros): 0.00