针对传统混凝土箱梁顶、底板均作为桥面系实现双层交通，存在制模难、施工周期长、自重大及钢筋易锈蚀等不足，提出FRP-混凝土组合箱形截面双层交通结构体系。该体系由FRP管混凝土空间桁架与FRP-混凝土组合顶、底板组成，可充分发挥FRP和混凝土材料各自优势，有效解决普通混凝土箱梁实现双层交通存在的难题，为城市立体交通建设提供一种新型组合结构型式。开展FRP-混凝土组合箱形截面双层交通结构体系受力机理及设计方法研究，将通过双层静载、动载和破坏性试验系统研究其整体受力性能，以及FRP管混凝土空间桁架、FRP-混凝土组合连接、截面畸变等关键性问题。在此基础上，建立合理的分析模型，进行非线性有限元全过程试验模拟和参数分析，提出适用计算公式和设计理论。项目研究可为FRP-混凝土组合箱形截面双层交通结构体系相关设计规范的编制、实现城市双层交通，提供试验依据和理论基础。

The traditional concrete box girder can be applied to double-deck traffic. The existence problems are difficult molding system,long construction period, large dead-weight, and corrosion of the steel bar and so on. The FRP-concrete composite box section for double-deck traffic structural system is proposed to aviod these disadvantages. The system consists of FRP tube concrete space truss, FRP-concrete composite roof/floor plate. The material advantage of FRP and concrete can be made full use of by this structure, which can provide a new structure type for city three-dimensional transportation. Research on the mechanical behavior and design theory of this new structure will be conducted, such as the bearing capacity under double-deck static/dynamic load and the destructive test for the performance of whole structure, the connect of FRP tube concrete space truss and FRP-concrete, distortion effect and so on. Based on experimental study, reasonable analysis model will be found by FEM. Furthermore, the whole process simulation and parameter analysis will be conducted to obtain the bearing rule. Then the practical calculation formula and design theory will be proposed. The projects will provide experimental and theoretical basis for the application of FRP-concrete composite box section structure for achieving double-deck traffic for city bridges.