Behaviour of new and existing steel and FRP reinforced concrete structures

加拿大的基础设施处于糟糕的状态。混凝土结构恶化的一个主要原因是钢筋的腐蚀，这是由于在典型的加拿大天气中发生的多次冻融循环和我们的高速公路上使用的除冰盐而加剧的。目前的提案将研究使用纤维增强聚合物作为钢的替代品，作为结构的内部和外部加固。将开发新结构的创新概念和现有结构的延长寿命技术，目标是建立可持续和耐用的基础设施。该方法包括开发结构行为的分析模型，这些模型得到在实际载荷下测试的各种结构部件的数据的支持和证实，包括重复和模拟的地震力。与钢骨混凝土结构相比，这一领域的现有信息相形见绌。在混凝土柱和内部用FRP加固的梁柱节点等领域，几乎没有任何信息。试件将包括用FRP筋内部加固的柱、节点和梁，以及最初用内部钢筋加固并通过FRP缝合进行抗震加固的板。为了建立FRP加固结构性能的非线性有限元模型，并研究型钢和FRP加固结构之间的差异，将特别关注FRP与混凝土之间的粘结以及FRP的抗拉硬化效应。

Canada's infrastructure is in a dire state. A major cause of deterioration of concrete structures is the corrosion of steel that is exacerbated by numerous freeze-thaw cycles that occur in typical Canadian weather and the deicing salts used on our highways. The current proposal would investigate the use of fibre reinforced polymers as an alternative to steel both as internal as well as external reinforcement for structures. Innovative concepts for new structures and life extension techniques for existing structures will be developed with the goal of creating sustainable and durable infrastructure. The methodology includes development of analytical models for structural behavior that are supported and corroborated with data from a large variety of structural components tested under realistic loads including repeated and simulated seismic forces. Available information in this field pales in comparison with that on steel-reinforced concrete structures. There is practically no information in areas, such as concrete columns and beam-column joints internally reinforced with FRP. Test specimens will include columns, joints and beams internally reinforced with FRP bars and slabs initially reinforced with internal steel reinforcement and retrofitted by stitching with FRP for seismic upgrade. To develop non-linear finite element models for the behavior of FRP-reinforced structures and to investigate the differences between steel-reinforced and FRP-reinforced structures, special attention will be paid to the bond between FRP and concrete, and the tension stiffening effect of FRP.