大跨径自锚式悬索桥吊索索力相邻影响分析

针对大跨径自锚式悬索桥吊索索力的相邻影响问题，采用模型试验与理论分析相结合的方法，研究吊索索力“相邻影响原理”所适用的结构状态， 说明部分吊索未出现相邻吊索张拉使其索力骤减的原因，分析结构体系转换对相邻吊索及其他吊索索力的影响规律，揭示吊索张拉对相邻吊索索力的削减程 度与吊索成桥索力来源之间的相互关系。结果表明：吊索索力“相邻影响原理”仅适用于结构体系转换完成后的结构状态；自锚式悬索桥采用对称张拉或单 侧张拉两种不同方案时，张拉对相邻吊索索力的削减机理及削减程度不同；在施工中，吊索张拉对其他吊索索力的影响范围与吊索初张力、主缆重力刚度等 因素相关，吊索张拉对非相邻吊索索力的影响程度均基本相同；相邻吊索索力、其他吊索索力受结构体系转换进程的影响，会出现不同的变化规律；前期张 拉的大部分吊索的成桥索力主要来源于除相邻吊索外其他吊索张拉产生的累计增长效应；后期张拉的小部分吊索的成桥索力主要来源于因吊索张拉获得的索 力。

Analysis on near influence of cable force in large-span self-anchored suspension bridges

The near influence of hanger cable force in large-span self-anchored suspension bridges is studied by theoretical calculation and model test. Suitable structural states to the cable force’s influence are analyzed and the reason that some hangers’ cable force plunges without the influence of adjacent hanger tensioning is illustrated. The influence of structural system transformation’  on adjacent and other hangers is presented. The relationship between the primary source of final cable force and reduction caused by the tensioning of adjacent hanger cables is revealed. The research results show that the near influence of the cable tensioned is only effective after the transformation of structural system is finished. Hanger-tension’s reduction on the forces of adjacent hangers are different under asymmetric tensioning and symmetrical tensioning. The influence range of hanger cable tensioning is related to the magnitude of initial tensioning force and the gravity stiffness of the main cable. Hangers except adjacent hangers were effected in almost the same degree when one hanger cable is tensioned. Cable forces of adjacent hangers and other hangers will be affected by the transformation of structural system in different ways. The primary source of final cable force is mainly from the tensioning of adjacent hanger cables. The source of final forces of most hangers is the cumulative effect of the non-adjacent hangers which were tensioned in the first stage. While the final forces of the hangers which were tensioned in the last stage are mainly from tensioning.