拉索调整对曲线形部分斜拉桥主梁扭转的影响

为研究曲线形部分斜拉桥的扭转受力性能,建立了考虑悬臂浇筑施工全过程的有限元模型,分析了主梁在永久作用和可变作用下的主梁扭矩分布规律以及扭矩与中跨圆心角的关系。在此基础上提出了调整曲线内外侧斜拉索的面积和索力分布以改善曲线形部分斜拉桥主梁扭矩分布的方法,并对此进行了实例验证。分析结果表明：拉索调整是一种改善曲线形部分斜拉桥主梁扭矩分布的有效方法。

Effect of cable adjustment on girder’s torsion of curved extradosed bridges

In order to study the girder’s torsion behavior of curved extradosed bridges,the finite element models considering the overall construction process of cantilever casting were established.The girder’s torque distribution under permanent action and variable action was analyzed,and then the relationship between girder’s torque and the radius angle of intermediate span was investigated.A method of adjusting the area and force of cables to improve the girder’s torque distribution of the curved extradosed bridge was put forward based on the study.In addition,an example verification was carried out.The analysis results indicate that cable adjustment is an effective method to improve the girder’s torque distribution of the curved extradosed bridge.