中文摘要：

为确定四索面钢箱梁斜拉桥的合理施工状态，先以构件弯曲、扭转应变能之和为目标函数，将多索面斜拉桥的索力优化问题转变为求解线性代数方程问题，并导出合理成桥状态空间索力及外内侧拉索索力比值；再以该合理成桥状态空间索力为目标索力，通过正装迭代法确定四索面钢箱梁斜拉桥合理施工状态；最后以嘉绍大桥（六塔四索面斜拉桥）为工程算例，建立该桥同一纵向位置等索力、空间索力2种空间模型，对比分析2种四索面钢箱梁斜拉桥模型的合理施工状态及其空间结构效应，以验证该方法的正确性。研究结果表明：四索面钢箱梁斜拉桥拉索空间效应显著，外内侧拉索初拉力比值分布较离散，近塔、墩处结构构造和受力较为复杂，其索力比值略大于1，其余标准梁段处索力比值为0．85～0．97；采用等索力模型会导致主梁内存在较大扭矩，横梁内存在较大弯矩等不利受力状态，索力优化后的空间结构计算模型的主梁扭矩、横梁弯矩均得到了改善；钢箱梁斜拉桥施工控制应以主梁线形控制为主，索力和应力控制为辅，对于结构受力复杂的塔梁交界处及边跨附近，应对其局部采取应力控制措施，以防止局部屈曲。提出的方法同样适应于其他类型多索面斜拉桥合理施工状态的确定。

英文摘要：

To research reasonable construction state of steel box girder cable-stayed bridge with four cable planes, an objective function of the sum of bending and torsion strain energy was built. Cable forces optimization of cable-stayed bridge with multi-cable planes was then transformed into solving linear algebraic equations. Cable forces and their ratios under reasonable completed state were derived. Then, taking spatial cable forces of reasonable completed state~ as target, the reasonable construction state of steel box girder cable-stayed bridge with four cable planes was determined by forward-iteration method. Furthermore, taking the Jiashao Bridge （steel box girder cable-stayed bridge with six pylons and four cable planes） as an example, finite element models with equivalent cable force and spatial cable force at the same longitudinal position were built, and reasonable construction state and spatial structure effect of two kinds of steel box girder cable-stayed bridge with four cable planes were comparatively analyzed to verify the validity of the method. The results show that the spatial effect of steel box girder cable-stayed bridge with four cable planes is significant, and the ratio distribution of initial cable force is discrete. Ratio of cable force is slightly more than 1, nearby tower and pier due to the complicated structure configuration and force state. The ratios distribution of cable force at the other standard beam sections are from 0.85 to 0.97, the model with equal cable force causes some negative effects in structure, such as large torque in main girder and large moment in cross beam. The optimized spatial structure calculation model gets much improvement, the construction of cable-stayed bridge with steel box girder should be mainly controlled by shape of main girder and supplemented by cable forces and stress control. In order to prevent local buckling, stress control measures should be taken at the junction of pylon and girder and side span whose structure and force are complex, this metho