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| Shear Lag Analysis of Simply Supported Box Girders under Prestressing Effect |
| LIN Peng-zhen, LIU Ying-long,SUN Li-xiang, YANG Zi-jiang, JI Wei |
| Lanzhou Jiaotong University, Lanzhou, Gansu 730070, China |
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Abstract Research purposes:In order to calculate the shear lag effect of box girders due to prestressing, analytical solutions of shear lag effect of simple supported box girders due to straight, harped and draped prestressing tendons are presented based on energy variational principle and equivalent load method. Taking a simple supported box girder as an example, shear lag effect under three tendons arrangements are calculated and compared with numerical solution which using shell finite element method. For 10 typical standard box girders on high-speed railway bridges, shear lag coefficient at the point of maximum stress are calculated.
Research conclusions:The results show the following conclusions:(1) Compared with solution of finite element method, the analytical solutions can effectively calculate the shear lag effect of simply supported beams due to the prestressing action. (2) For typical standard box girders on high-speed railway bridges, the straight tendons arrangement can cause the minimum shear lag effect, followed by draped tendons, harped tendons are the maximum. (3) The research results have theoretical references for the design of prestressed concrete box girders.
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Received: 04 April 2014
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[1] Edward G. Nawy. Prestressed Concrete: A Fundamental Approach [M]. New Jersey: Prentice Hall,2006.
[2] 牛斌,杨梦蛟,马林. 预应力混凝土宽箱梁剪力滞效应试验研究[J].中国铁道科学,2004(2):25-30.
Niu Bin, Yang Mengjiao, Ma Lin. Shear Lag Effect Test and Study of PC Wide Box Beam[J]. China Railway Science, 2004(2):25-30.
[3] 余天庆,宁柳明. 悬臂预应力箱梁的剪力滞效应有限元分析[J]. 湖北工业大学学报,2010(2):86-88.
Yu Tianqing, Ning Liuming. Finite Element Analysis of Shear Lag Effect in PC Box-girder[J]. Journal of Hubei University of Technology, 2010(2):86-88.
[4] 乐小刚,余晓琳. 预应力对混凝土宽箱梁桥剪力滞的影响分析[J]. 中国市政工程,2008(5):80-81.
Le Xiaogang, Yu Xiaolin. Analysis of Impact from Prestress on Shear Lag from Wide Concrete Box Girder Bridge[J]. China Municipal Engineering, 2008(5):80-81.
[5] 王荣霞,金克喜,王玲.体外预应力筋加固不同初始状态箱梁受力性能的试验研究[J]. 土木工程学报,2010(S2):224-229. |
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2014, Vol. 31 
