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曲线连续梁桥单支点支承预偏心距的设置不仅要考虑主梁扭矩的分布,同时还要考虑主梁的扭转角位移、主梁端部支承反力是否受拉等因素。通常单支点支承预偏心值的计算是要通过多次试算而获得,这种方法虽然较为准确,但试算次数多、计算起来比较复杂,作为结构复算可以,但作为设计方法还是较为繁琐的。本文综合考虑上述因素,通过总结设计实践中的经验,提出了“面积等分法”的计算方法以获得近似的预偏心值,可以作为进一步试算的起算值,也可以作为平时设计的参考值。
The setting of pre-eccentricity of single-point support of curved continuous beam bridge not only needs to consider the distribution of main-beam torque, but also the torsional angle displacement of main girder and whether the end-bearing reaction force of main girder is pulled or not. Usually single-point support pre-eccentricity value is calculated through several trials to obtain, although this method is more accurate, but the trial count more complex to calculate, as the structure of re-calculation, but as a design method is still more complicated of. In this paper, the above factors are considered synthetically, and by summing up the experience in design practice, a calculation method of “Area Bisection Method” is proposed to obtain approximate pre-eccentricity value, which can be used as a starting point for further trial calculation, Reference.