中文摘要：

通过剪应力放大系数修正按平面杆系计算的活载剪应力值，来考虑空间扭转和畸变影响带来的剪应力放大，结合泰州长江大桥引桥为例对活载应力放大系数进行探讨，通过基于有限元的数值计算，探讨了变截面的剪应力放大系数沿跨度分布规律，研究表明，变截面连续宽梁桥的剪应力放大系数沿桥是变化的，剪应力放大系数取以前的1．05经验值对于支座附近以外的区段是偏于不安全的，除墩顶附近截面外，其他部位的剪应力放大系数可达1．7左右，在腹板上缘取得最大值。

英文摘要：

Through the shear stress amplification coefficient to correct the shear stress values ac- cording to the plane truss calculation of live load ,to consider spatial torsion and distortion caused by the influence of shear stress amplification, combined with Taizhou Yangtze River bridge bridge as an example on live load stress magnification coefficient are discussed, based on the finite element numerical calcula- tion, studied the shear stress magnification coefficient along the span distribution., research shows that the variable cross section continuous beam bridge, the shear stress amplification coefficient along the bridge is changing, shear stress amplification coefficient of previous 1.05 experience points for support outside the near section is unsafe, except near the pier top section, other parts of the shear stress amplification coefficient can reach about 1.7, in the upper edge of the web to get maximum value.