Abstract: A 3-dimensional finite element calculating model is established for the main bridge of Xiazhang to North Branch of the south approach spans the third joint by using software Midas Civil．The influence of various factors on the large curvature continuous bridge alignment and internal forces is researched and these factors include the height difference of vertical beam，beam of negative height of vertical，horizontal axis deviation，stand deviation ， and the unevenness of the effective prestress．The results show that the beam height difference and the prestressed cross-section unevenness have severe influence on the girder deflection and stress；the top of the negative beam height，axis deviation ， and the unevenness degrees of prestressed beam is followed in order．And the infl uence of bearing deviation on girder deflection and stress can almost be ignored．

Key words: cantilever erection, curve prestressed continuous girder bridge, structural parameters, sensitivity analysis

摘要： 以厦漳跨海大桥北汉南引桥第3联为研究对象，采用Midas Civil大型桥梁分析软件进行建模，研究了梁顶纵 向正高差、梁顶纵向负高差、轴线水平偏位、支座偏位、以及有效预应力不均匀度对大曲率曲线连续梁桥线形和内力 的影响。结果表明：梁顶纵向正高差和各束预应力同截面不均度对主梁挠度和应力影响最大，其次是梁顶纵向负高 差、轴线水平偏差和预应力同束不均匀度，支座偏差对主梁挠度和应力影响基本可以忽略。

关键词: 悬臂拼装, 曲线预应力连续梁桥, 结构参数, 敏感性分析