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.

加拿大的基础设施处于可怕状态。混凝土结构恶化的主要原因是钢的腐蚀，这种钢被典型的加拿大天气和我们高速公路上使用的盐分发生的许多冻融周期加剧。当前的建议将调查纤维增强聚合物的使用作为内部和外部增强钢的替代方法。针对现有结构的新结构和寿命延长技术的创新概念将开发，目的是创建可持续和耐用的基础设施。该方法包括开发用于结构行为的分析模型，这些模型得到了支持和证实的数据，并通过在现实载荷（包括重复和模拟地震力）下测试的各种结构组件的数据进行了证实。与钢筋混凝土结构相比，该领域的可用信息与之相比。几乎没有信息，例如混凝土柱和内部用FRP加固的梁柱接头。测试样品将包括最初用内部钢筋加固的FRP棒和板的柱，关节和梁，并通过使用FRP缝制进行地震升级而进行改造。为了开发非线性有限元模型，以用于FRP增强结构的行为，并研究钢增强和FRP增强结构之间的差异，将特别注意FRP和混凝土之间的键，以及FRP的张力僵硬效应。这项研究的最终目的是制定无法可用的设计准则，并改进了FRP增强结构的现有准则和代码规定。在该领域的当前最新面积，设计师对钢筋混凝土结构的FRP增强结构没有相同的信心。拟议的工作将解决这一缺陷，并有助于提高设计师的信心。