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Structural Engineering and Mechanics Volume 48, Number 3, November10 2013 , pages 395-414 DOI: https://doi.org/10.12989/sem.2013.48.3.395 |
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Mechanical performance and design optimization of rib-stiffened super-wide bridge deck with twin box girders in concrete |
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Wen Xiong, Jianshu Ye, Xuemei Gai and C.S. Cai
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| Abstract | ||
| The present study fundamentally investigated the mechanical performance of the rib-stiffened super-wide bridge deck with twin box girders in concrete, which is a very popular application to efficiently widen the bridges with normal span. The shear lag effects of the specific cross-sections were firstly studied. The spatial stress distribution and local stiffness of the bridge deck with twin box girders were then investigated under several typical wheel load conditions. Meanwhile, a comparative study for the bridge deck with and without stiffening ribs was also carried out during the investigation; thereby, a design optimization for the stiffening ribs was further suggested. Finally, aiming at the preliminary design, an approximate methodology to manually calculate the bending moments of the rib-stiffened bridge deck was analytically proposed for engineers to quickly assess its performance. This rib-stiffened bridge deck with twin box girders can be widely applied for concrete (especially concrete cable-stayed) bridges with normal span, however, requiring a super-wide bridge width due to the traffic flow. | ||
| Key Words | ||
| twin box girders; super-wide bridge deck; stiffening ribs; concrete; mechanical performance; optimization | ||
| Address | ||
| Wen Xiong, Jianshu Ye, Xuemei Gai : Department of Bridge Engineering, School of Transportation, Southeast University, Nanjing, 210096, China C.S. Cai : Department of Civil and Environmental Engineering, Louisiana State University, Baton Rouge, LA 70803, USA | ||