“月牙形”独塔曲线斜拉桥成桥计算及结构优化研究
Study on finished state and structure optimization of crescent-shaped curved cable-stayed bridge with single tower

为研究独塔单索面单侧拉吊曲线斜拉桥结构受力性能，以一种新型而特殊的“月牙形”独塔曲线斜拉人行桥为工程背景，采用有限元法分析计算其合理成桥状态。针对主梁局部存在截面转角相对较大的问题，提出3种解决方案：合理布置水平斜撑的“被动”方案、设置拉压杆预应力的“主动”方案和联合方案。研究结果表明：将主塔塔顶横向位移作为主要设计目标，按斜拉索对主塔的施力方向对斜拉索分组，辅以刚性支承连续梁法、影响矩阵法对该桥进行成桥索力计算较为快速和合理；通过合理布置桁架结构和引入预应力，可在满足规范要求、减轻结构整体重量的同时减小局部截面转角较大的问题，提高结构受力性能。研究结果可为同类型斜拉桥的设计提供参考。
In order to study the mechanical characteristics of the unilateral tension curved cable-stayed bridge with single tower and single plane, a FE model of a new and special crescent-shaped curved cable-stayed bridge with single tower was established, and the finished complete state was calculated and analyzed. Three solutions planes were put forward to solve the problem of relatively large angular displacement of local cross section: passive plan of cross bracing system, active plane of strut and tie system and plane of combination. The results show that the method of setting lateral displacement of the tower as main design object, grouping cables by direction of cable force to tower, supplementing with rigid support continuous beam method and influence matrix method can calculate the rational cable force quickly and reasonably. The reasonable arrangements of cross bracing and prestressing force can improve the mechanical performance of bridge, reduce the overall weight of the structure and meet the requirement of structure performance at the same time. The results can provide a reference for the same kind of cable-stayed bridge design