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预偏心距的取值为道路中心线与弯桥单位长梁段自重重心间的距离,箱形截面的弯梁桥已有预偏心矩计算公式,对于梯形空心板截面弯梁桥,对预偏心矩的计算公式进行了理论推导,推导出具有梯形空心板截面连续弯桥的体积偏心计算公式,它对在弯桥中墩上的单点铰支座合理地设置预偏心具有实用价值。
The value of the pre-eccentricity is the distance between the center of gravity of the road and the center of gravity of the long girder of the curved bridge, and the formula of pre-eccentric moment for the box girder with box-section. For the curved girder with trapezoidal hollow section, The calculation formula of moment is deduced theoretically. The formula of volume eccentricity with continuous curved bridge with trapezoidal hollow section is deduced. It is of practical value to set pre - eccentricity reasonably in the single point hinge support on the pier in curved bridge.