采用GFRP筋作为约束构件的体内不配筋混凝土板带的工作性能研究

INVESTIGATION OF BEHAVIOUR OF CONCRETE SLAB STRIP RESTARINED BY GFRP WITHOUT INTERNAL REINFORCEMENT

本文建立一种基于压缩薄膜效应(Compressive Membrane Action,CMA)的采用GFRP筋作为体外约束构件的预制混凝土桥面板,并对其在静力荷载作用下的工作性能进行试验研究。通过将试验与传统桥梁面板结构进行对比发现,本文采用GFRP的新型预制桥面板与传统桥梁面板结构相比,极限承载力提高了57%左右;采用GFRP材料作为体外约束构件,合理使用面板内压缩薄膜效应作为承载机制,充分利用GFRP材料良好的抗拉性能和耐久性提高了结构的可持续性。

A arch-shaped concrete slabs strip without internal reinforcement was proposed in this study based on compressive membrane action（ CMA）. In this novel structure,glass fiber reinforced polymer（ GFRP） rods were used as restraint components to develop this membrane action. Therefore,the loading capacity of concrete deck slabs can be enhanced significantly. The behaviour of those concrete strips were studied experimentally. Through the parametric study,it was concluded that the loading mechanism of this slab structure was dependent on internal compressive membrane action and the loading-carrying capacity could be affected significantly by the lateral restraint stiffness. With the application of GFRP material and CMA,the structural durability is improved and the loadingcarrying capacity is not affected in this deck structure.