创新设计的FRP-混凝土组合梁基本力学性能(英文)

Fundamental mechanical behavior of innovatively designed hybrid FRP-concrete beams

近年来纤维增强聚合物(Fiber Reinforced Polymer,FRP)材料被广泛地用于桥梁结构以解决日益严重的钢材锈蚀问题.为了充分发挥各种材料的优势和降低造价,FRP-混凝土组合结构被认为是一种最有效的组合形式.首先阐述了FRP材料与混凝土结合形成一种轻质、耐腐蚀且价格相对便宜的组合梁的创新设计思路,并提出了由该类型组合梁形成板式桥的新型桥面结构形式;其次,给出了FRP-混凝土组合梁的简化失效分析方法以及延性、简化刚度和变形的计算公式;最后,基于刚度、强度和延性设计要求,给出了FRP-混凝土组合梁的初步设计步骤.

In recent years Fiber Reinforced Polymer （FRP） material has been widely applied in the bridge engineering to solve the corrosion of the reinforcing steel. To make the best use of materials and reduce the initial cost, hybrid FRP-concrete structures have been considered as the most effective composite form. The basic design concepts for hybrid FRP concrete beams and bridge decks consisted of a number of individual hybrid beams are introduced detailedly in this paper.The concepts result in cost-effective composite members with pseudo-ductile characteristics and high stiffness and strength properties. The study presents methods of simplified failure analysis, ductility consideration, and simplified calculations of stiffness and deformation for the proposed hybrid FRP-concrete beams. A preliminary design procedure for the hybrid beams is also presented, based on a complete set of stiffness, strength and ductility design requirements.