Behaviour of new and existing steel and FRP reinforced concrete structures

加拿大的基础设施处于可怕的状态。混凝土结构恶化的一个主要原因是钢材的腐蚀，而在典型的加拿大天气和高速公路上使用的除冰盐中发生的大量冻融循环加剧了钢材的腐蚀。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加固。将开发新结构的创新概念和现有结构的寿命延长技术，以创建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，这些模型得到了在实际荷载（包括重复和模拟地震力）下测试的各种结构部件数据的支持和证实。与钢筋混凝土结构相比，该领域的现有信息相形见绌。实际上，在诸如用FRP内部加固的混凝土柱和梁柱节点等领域没有任何信息。测试样本将包括内部用FRP筋加固的柱、接头和梁，以及最初用内部钢筋加固并通过FRP拼接进行抗震升级的板。为了建立FRP加固结构的非线性有限元模型，并研究钢筋和FRP加固结构之间的差异，将特别注意FRP和混凝土之间的粘结，以及FRP的拉伸加劲效应。 本研究的最终目标是制定设计指南，在没有可用的和改进现有的指南和规范规定的FRP加固结构。随着目前该领域的最新技术水平，设计师对FRP加固结构的信心程度不如钢筋混凝土结构。拟议的工作将解决这一不足，并有助于提高设计师的信心。

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. The final objective of this research is to develop design guidelines where none is available and improvements in the existing guidelines and code provisions for FRP reinforced structures. With the current state-of-the-art in the field, designers do not feel the same level of confidence with FRP reinforced structures that they have for steel reinforced concrete structures. The proposed work would address this deficiency and help improve confidence of designers.