Behaviour of new and existing steel and FRP reinforced concrete structures

新建和现有钢结构和 FRP 钢筋混凝土结构的性能

• 批准号: 44341-2013
• 负责人: Sheikh, Shamim
• 金额: $ 2.04万
• 依托单位: University of Toronto
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2017
• 资助国家: 加拿大
• 起止时间: 2017-01-01 至 2018-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=636066
• 关键词: Behaviour; new; existing; steel; FRP

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.

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。本研究的最终目标是在尚无设计指南的情况下制定设计指南，并改进FRP加固结构的现有指南和规范规定。根据目前该领域的最新技术，设计师对FRP加固结构的信心不如对钢筋混凝土结构的信心。建议的工作将解决这一不足，并有助于提高设计师的信心。