以实桥为背景采用有限元法,进行了预应力对上部结构箱梁剪力滞的影响分析,分析认为预应力的施加平抑了部分区域弯刚构桥箱梁剪力滞现象,但也在部分区域加剧了该效应,同时加剧了结构横向应力的不对称性,在进行设计时有必要对曲梁内外侧预应力进行区别配置,同时也说明采用梁系方法不能真实反映结构的实际受力情况。 Taking the real bridge as the background, the influence of prestressing on shear lag of superstructure box girder is analyzed by finite element method. The analysis shows that the prestressing restrains the shear lag phenomenon of box girder of curved rigid frame bridge in some areas, This effect is exacerbated in some areas and the asymmetry of lateral stress in the structure is exacerbated. It is necessary to differentiate the prestressing force inside and outside the curved beam during the design, and also to show that the beam system can not truly reflect the actual force of the structure Happening.