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Frontiers of Structural and Civil Engineering

2019, Volume 13,  Issue 4, Pages 981-989
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    Innovative steel-UHPC composite bridge girders for long-span bridges

    Key Laboratory for Wind and Bridge Engineering of Hunan Province, Hunan University, Changsha 410082, China

    Accepted： 2019-05-20 Available online：2019-05-20
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    10.1007/s11709-019-0531-9
    Cite this article
    Xudong SHAO, Lu DENG, Junhui CAO.Innovative steel-UHPC composite bridge girders for long-span bridges[J].Frontiers of Structural and Civil Engineering,2019,13(4):981-989.

    Abstract

    Steel and steel-concrete composite girders are two types of girders commonly used for long-span bridges. However, practice has shown that the two types of girders have some drawbacks. For steel girders, the orthotropic steel deck (OSD) is vulnerable to fatigue cracking and the asphalt overlay is susceptible to damage such as rutting and pot holes. While for steel-concrete composite girders, the concrete deck is generally thick and heavy, and the deck is prone to cracking because of its low tensile strength and high creep. Thus, to improve the serviceability and durability of girders for long-span bridges, three new types of steel-UHPC lightweight composite bridge girders are proposed, where UHPC denotes ultra-high performance concrete. The first two types consist of an OSD and a thin UHPC layer while the third type consists of a steel beam and a UHPC waffle deck. Due to excellent mechanical behaviors and impressive durability of UHPC, the steel-UHPC composite girders have the advantages of light weight, high strength, low creep coefficient, low risk of cracking, and excellent durability, making them competitive alternatives for long-span bridges. To date, the proposed steel-UHPC composite girders have been applied to 14 real bridges in China. It is expected that the application of the new steel-UHPC composite girders on long-span bridges will have a promising future.

    Keywords

    steel-UHPC composite bridge girder ; long-span bridge ; orthotropic steel deck ; fatigue cracking ; durability
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