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.
蔺鹏臻，刘应龙，孙理想，杨子江，冀伟. 预应力作用下简支箱梁桥的剪力滞效应分析[J]. 铁道工程, 2014, 31(11): 54-58.
LIN Peng-zhen, LIU Ying-long,SUN Li-xiang, YANG Zi-jiang, JI Wei. Shear Lag Analysis of Simply Supported Box Girders under Prestressing Effect. 铁道工程, 2014, 31(11): 54-58.
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2014, Vol. 31 
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