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Frontiers of Structural and Civil Engineering

Front. Struct. Civ. Eng.    2019, Vol. 13 Issue (4) : 981-989
Innovative steel-UHPC composite bridge girders for long-span bridges
Xudong SHAO(), Lu DENG, Junhui CAO
Key Laboratory for Wind and Bridge Engineering of Hunan Province, Hunan University, Changsha 410082, China
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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     
Corresponding Authors: Xudong SHAO   
Just Accepted Date: 12 April 2019   Online First Date: 20 May 2019    Issue Date: 10 July 2019
 Cite this article:   
Xudong SHAO,Lu DENG,Junhui CAO. Innovative steel-UHPC composite bridge girders for long-span bridges[J]. Front. Struct. Civ. Eng., 2019, 13(4): 981-989.
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Xudong SHAO
Junhui CAO
Fig.1  Typical cross section of Type-1 girder
Fig.2  Push-out tests on shear connectors of Type-1 girder. (a) Test setup; (b) failure model
Fig.3  Photographs of the static load test. (a) Test setup; (b) failure model
Fig.4  Comparison of stress ranges based on FE analysis. (a) FE analysis result; (b) positions of details
Fig.5  Fatigue test setup
Fig.6  Photographs of the application of the Type-1 composite girder
number bridge name province span (m) description of bridge type
1 the 11th span of Mafang Bridge Guangdong 64 simply supported steel box girder bridge
2 Focheng New Bridge Guangdong 58.5+ 112.8+ 58.5 three-span continuous steel box girder bridge
3 Hexi Transportation Hub Municipal Engineering Hunan 54.4 simply supported steel box girder bridge
4 Tonghui River Bridge Beijing 11.5+ 60+ 18.5 upper-bearing arch bridge
5 Haihe Bridge Tianjin 310+ 190 single tower cable-stayed bridge
6 Beiyunhe Bridge Beijing 30+ 40+ 70+ 40+ 30 upper-bearing arch bridge
7 Fengxin Bridge Hunan 300 self-anchored suspension bridge
8 Queshi Bridge Guangdong 518 twin towers double cable plane cable-stayed bridge
9 Lichuan Bridge Guangdong 138 harp-shapped cable-stayed bridge
10 Jiaoshanmen Bridge Zhejiang 36.5 beam bridge with hanging cantilevers
11 Xinming Road Bridge Guizhou 32+ 56+ 32 V-shapped steel girder bridge
12 Guangzhongjiang Expressway Longxi Interchange Ramp Bridge No. A Guangdong 28+ 50+ 28 steel box girder bridge
13 Shendang Bridge Zhejiang 72 steel truss simply supported girder bridge
14 Wuyi Bridge Zhejiang 60+ 128+ 60 steel-concrete hybrid beam continuous girder bridge
Tab.1  Applications of the Type-1 steel-UHPC composite girder
Fig.7  Schematic of the Type-2 girder
Fig.8  Photographs of the test setup
Fig.9  Fatigue investigations on the Type-2 girder. (a) FE analysis results; (b) fatigue test on a full-scale specimen
Fig.10  Schematic of the Type-3 girder
Fig.11  Half cross section of the composite girder (unit: mm)
Fig.12  Photographs of the test specimen
1 S H Park, D J Kim, G S Ryu, K T Koh. Tensile behavior of ultra high performance hybrid fiber reinforced concrete. Cement and Concrete Composites, 2012, 34(2): 172–184
2 K Wille, D J Kim, A E Naaman. Strain-hardening UHP-FRC with low fiber contents. Materials and Structures, 2011, 44(3): 583–598
3 X D Shao, D T Yi, Z Y Huang, H Zhao, B Chen, M L Liu. Basic performance of the composite deck system composed of orthotropic steel deck and ultra-thin RPC layer. Journal of Bridge Engineering, 2013, 18(5): 417–428
4 N Ding, X D Shao. Study on fatigue performance of light-weighted composite bridge deck. China Civil Engineering Journal, 2015, 48(1): 74–81 (In Chinese)
5 J H Cao, X D Shao, Z Zhang, H Zhao. Retrofit of an orthotropic steel deck with compact reinforced reactive powder concrete. Structure and Infrastructure Engineering, 2016, 12(3): 411–429
6 ECS. Eurocode3 (EN1993–1-9): Design of Steel Structures, Part 1–9: Fatigue. European Committee for Standardization, 2005
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