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
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
摘要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.
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.
基金资助: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)
周亚栋, 邵旭东. 二次预应力组合梁及其在公路桥梁中的应用[J]. Journal of Highway and Transportation Research and Development, 2015, 9(2): 47-53.
ZHOU Ya-dong, SHAO Xu-dong. Research on Twice-prestressed Composite Beam and Its Application in Highway Bridges. Journal of Highway and Transportation Research and Development, 2015, 9(2): 47-53.
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2015, Vol. 9 
