大跨度自锚式斜拉-悬吊协作体系桥模型试验研究

某跨海大桥主通航孔为主跨800m的自锚式混合梁斜拉一悬吊协作体系桥，通过模型试验对该新桥型的静力性能和动力特性进行了详细的研究，与基于有限元理论的计算结果进行了对比，试验结果与理论结果相吻合；分析了辅助墩、混合梁对该体系的动力影响：边跨增设辅助墩后，协作体系的各阶频率都有所增大，能改善协作体的1阶竖弯和1阶侧弯频率。能抑制桥梁在风载作用下的侧向位移；采用混合梁结构形式，使主梁自振频率均增加，提高了全桥的竖弯和横弯刚度，为自锚式斜拉一悬吊协作体系桥的设计和力学性能研究提供参考依据。

Model Test for Large-span Self-anchored Cable-stayed Suspension Bridge

Based on the model test of a self-anchored hybrid beam cable-stayed suspension bridge with the 800m main span, the static property and dynamic characteristis of the bridge are analysed.The test results show good agreement compared with FEM results.The influence of auxiliary pier and hybrid girder on the dynamic characteristics is analysed. All the frequencies are increased when the auxiliary pier is set.The first order upright bend frequency and the first order side bend frequency are improved, and the lateral displacement of girder is decreased under wind load.The structure stiffness of hybrid girder can be increased by improving the upright bend frequency and the side bend frequency .The conclusions are helpful for research and design on self-anchored cable-stayed suspension bridge.