Behaviour of new and existing steel and FRP reinforced concrete structures

加拿大的基础设施状况堪忧。混凝土结构恶化的一个主要原因是钢材的腐蚀，在典型的加拿大天气中发生的多次冻融循环和我们高速公路上使用的除冰盐加剧了钢材的腐蚀。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增强材料。新结构的创新概念和现有结构的寿命延长技术将以创造可持续和持久的基础设施为目标而发展。该方法包括开发结构行为的分析模型，这些模型得到了各种结构部件在实际载荷（包括重复和模拟地震力）下测试的数据的支持和证实。这一领域的现有资料与钢筋混凝土结构的资料相比相形见绌。在混凝土柱和内部用FRP加固的梁柱节点等区域几乎没有信息。测试样本将包括柱、节点和梁，内部用FRP筋加固，板最初用内部钢筋加固，然后用FRP拼接进行加固，以进行抗震升级。为了建立FRP增强结构的非线性有限元模型，并研究钢增强和FRP增强结构之间的差异，将特别关注FRP与混凝土之间的粘结以及FRP的张拉加劲效应。

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.