双塔联体分幅斜拉桥塔结构模型实验索力测试结果分析

以甬江特大斜拉桥为工程背景,对其整个联塔结构进行室内模型试验研究.针对模型试验中加载斜拉索的布置位置、数量及索力的确定,提出了最少索数的索力优化方法,编制了相应的数值程序.在满足预期目标的前提下,以最少斜拉索数量为原则,确定了试验中斜拉索的优化布置及相应的优化索力及各级加载索力,对优化索力和试验中的测试索力进行比较分析,结果表明索力优化方法可行,两联塔之间索力相互影响较小.

Measurement Result Analysis of Cable Forces in Model Experiment for Pylon of Cable-stayed Bridge with Twin-united Pylons and Twin Separate Girders

Taking Yongjiang super-large cable-stayed bridge as an example, model experimental study of united twin-pylons was carried out. In order to optimally determine the position of stayed-cables, the number of stayed-cables and cable forces in the experiment, the mathematical programming mode and numerical program for the least cables were established. On the premise of meeting expected targets, the assign position, corresponding cable force and tension force under different load levels were optimally determined according to the principle of minimal cable number. The optimized cable forces and test cable forces were compared and analyzed. Results show that the optimized method is feasible and the interaction of cable forces between united twin-pylons is less.