Abstract: This paper firstly introduces the PC beam’s construction characteristics of Chongqing Jiayue Bridge and the simulated analytical result of the internal stress of the girder． The 1∶ 3 scale-down model test of the PC beam is established to verify the above calculation result． Finally，the applicability of cable-girder anchorage structure in the extra-dosed cablestayed bridge of the PC beam is discussed，as well as the safety of the cable-girder anchorage structure under the kilo-ton cable force． Some useful conclusions and suggestions are presented concerning Jiayue Bridge’s design and construction．

Key words: Extra-dosed cable-stayed bridge, C60 concrete box girder, model experiment, stress concentration, cracking load, shear lag

摘要： 介绍了重庆嘉悦大桥的主梁结构特点，以及该桥的主梁节段空间应力仿真分析结果，并介绍了为验证计算结 果所做的主梁一节段1∶ 3 缩尺模型试验的研究情况。从理论和实践上探讨了PC 主梁部分斜拉桥采用特殊索梁锚 固结构的可行性，以及锚固结构在超大索力作用下的安全性，得到了一些对设计、施工有益的结论和建议。

关键词: 矮塔斜拉桥, C60 混凝土箱梁, 模型试验, 应力集中, 开裂荷载, 剪力滞后