为研究大跨度组合-混合梁斜拉桥结合段的传力机理，以主跨为580 m的富龙西江大桥为例，对中腹板区域进行1∶2缩尺模型试验和有限元模型分析，研究组合梁截面各参数对结合段轴向力传递路径的影响规律。研究结果表明：组合梁-混凝土梁结合段中传递轴向力的部件为结合段混凝土、桥面板及各类埋入钢板上的剪力连接件； 承压交界面上的承压板、桥面板与剪力件群传递轴向力占比分别是32.2%、45.0%、22.8%；增大桥面板厚度，可有效提升桥面板的传力占比，并减少承压板传力占比，而增大组合梁顶钢板厚度能提高剪力件群的传力占比，减小桥面板传力占比；承压板较薄时，增大承压板厚度，可增大承压板的传力占比，减小桥面板及剪力连接件的传力比，但承压板厚度达到一定数值后，增加承压板厚度不会改变各部分传递的轴力占比。
In order to study the force transfer mechanism of the composite-hybrid beam joint section of long-span cable-stayed bridge，the 1/2 scale model test and finite element analysis were carried out based on the Fulong Bridge with 580 m main span. The influence of various parameters of the composite beam section on the axial force transfer path of the joint section was obtained. The results show that the axial force in the composite-hybrid beam joint section is transferred by the concrete，the deck，and the shear connectors on the embedded steel plates. The ratios of axial force carried by the bearing plate，the deck and the shear connector group are 32.2%，45% and 22.8%，respectively. By increasing the thickness of the bridge panel，the force transfer ratio of the bridge panel can be effectively improved and the force transfer ratio of the bearing plate can be reduced. By increasing the thickness of the top plate of composite beam，the force transfer ratio of shear connectors will be increased and the force transfer ratio of bridge deck can be reduced. When the bearing plate is thin，with the increase of the bearing plate thickness，the force transfer ratio of the bearing plate will be increased， and the force transfer ratio of the bridge deck and the shear connectors will be decreased.However， when the thickness of the bearing plate reaches a certain value，the load transfer ratio of each part can not be affected by the increase of bearing plate thickness.