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Research of efficient width of flange in wide flanged girder with variable cross section and long over-hanging flange

LI Li-feng,~1 SHAO Xu-dong,~1 CHENG Xiang-yun,~1 BAO Wei-gang,~2 YUAN Lun-yi~2 (1.Hunan University, Changsha 410082, China; 2.Highway Planning and Design Institute of China Communications Engineering Group, Beijing 100010, China)  
Normal stress of 20 PC bridges, with wide flanged box girder, is analyzed with the methods of spatial plate/shell FEM, plane frame FEM and DIN 1075. According to the stress results, the paper makes an analysis of shear lag efficient of three main sections in girders. Available method of equivalent simple supported span length of different sections is advised according to DIN 1075. The basal research will make the new bridge specification being more scientific and reasonable.
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