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| Research on Twice-prestressed Composite Beam and Its Application in Highway Bridges |
| ZHOU Ya-dong1,2, SHAO Xu-dong3 |
1. Henan Transportation Research Institute Co., LTD, Zhengzhou Henan 450006, China;
2. Key Laboratory of Bridge Engineering Safety Control by Hunan Province, Department of Education, Changsha University of Science & Technology, Changsha Hunan 410114, China;
3. School of Civil Engineering, Hunan University, Changsha Hunan 410082, China |
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Abstract The concept, basic principle, and characteristics of twice-prestressed composite beam are introduced, and the mechanical performance, deformation performance, and creep stress redistribution of the horizontal interface of twice-prestresed beam are discussed. In addition, previous studies regarding the application of twice-prestressed composite beams in highway bridges are summarized and analyzed. It is concluded that the twice-prestressed composite beam can decrease the creep camber of a prestressed concrete beam by more than 50%; thus, the contradiction of reducing creep camber and improving the safety of section crack resistance can be effectively resolved. Moreover, twice-prestressed composite beam can save approximately 10% of prestressed tendons and has comprehensive technical and economical advantages in highway ultrathin beam bridges and urban overpass bridges. Future research of twice-prestressed composite beam will focus on the design method, connection model, structure, and shear performance of horizontal interface in addition to, and the construction technology.
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Received: 12 March 2015
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| Fund:Supported by the National Natural Science Foundation of China (No.50778071);the Open Fund of Key Laboratory of Bridge Engineering Safety Control by Hunan Province and Department of Education, Changsha University of Science & Technology (No.14KB04) |
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[7] ZHANG Wei. Study on Twice Prestressed Composite Ultra-thin Beam and Its Experiment[D]. Changsha:Hunan University, 2004. (in Chinese)
[8] SHAO Xu-dong, LI Li-feng, ZHANG Wei. Test Study of Double Prestressed Composite Structure[J]. China Journal of Highway and Transport, 2006, 19(1):75-79. (in Chinese)
[9] SHAO Xu-dong, ZHANG Wei, PENG Cong, et al. An Experimental Study on the Creep Behavior and Bearing Capacity of Twice Prestressed Concrete Beams[J]. China Civil Engineering Journal, 2009, 39(8):81-86. (in Chinese)
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2015, Vol. 9 
