Multiscale analysis of GFRP reinforcements for concrete under special stress and environmental conditions- modelling strength and durability

特殊应力和环境条件下混凝土 GFRP 加固的多尺度分析 - 建模强度和耐久性

• 批准号: 476709-2014
• 负责人: Polak, Maria
• 金额: $ 3.91万
• 依托单位: University of Waterloo
• 依托单位国家: 加拿大
• 项目类别: Collaborative Research and Development Grants
• 财政年份: 2015
• 资助国家: 加拿大
• 起止时间: 2015-01-01 至 2016-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=578738
• 关键词: Multiscale; analysis; GFRP; reinforcements; concrete

The research addresses a crucial question of performance of glass fibre reinforced polymer (GFRP) reinforcements for concrete construction. In particular, testing and numerical analysis of GFRP composites and GFRP reinforced concrete structures are proposed. These include short-term and long-term performance and subsequent failure. Long-term performance influences failure and it is likely the most critical issue that needs to be addressed in order to safely use GFRPs as structural materials. The composite GFRP bar is an engineered material with high strength in the fibre direction, which is generally aligned along the bar. GFRP reinforcing bars are composed of glass fibres and a resin matrix, which holds the fibres together and protects them from the surrounding media. GFRP composites have been successfully used as reinforcement in concrete structures where corrosion or electromagnetic inertness is a concern. This proposal addresses evaluation and development of design methods, material specifications and test methods for GFRP reinforcements concentrating on mechanical performance of bent bars (bars manufactured under non-typical manufacturing conditions), bond properties, and durability of these bars. Unusual loading conditions like dowel strength are also addressed, in contrast to the simplified single load level tests on which current GFRP standards are based. A performance-based description of short and long-term resistance is proposed to describe limit states and realistic safety margins. Hence, the primary objective of this work is to provide information and design recommendations regarding safe levels of strength for GFRP bars used in construction.

这项研究解决了混凝土结构用玻璃纤维增强聚合物(GFRP)增强材料的一个关键问题。特别是对GFRP复合材料和GFRP加固混凝土结构进行了试验和数值分析。这些问题包括短期和长期表现以及随后的失败。长期性能会影响失效，这可能是安全使用玻璃钢作为结构材料需要解决的最关键问题。 复合玻璃钢筋是一种沿纤维方向具有高强度的工程材料，一般沿筋对齐。玻璃纤维增强筋由玻璃纤维和树脂基质组成，它将纤维结合在一起并保护它们免受周围介质的影响。玻璃钢复合材料已被成功地用于混凝土结构中的钢筋，其中腐蚀或电磁惰性是一个问题。 这项建议涉及评估和发展玻璃钢增强材料的设计方法、材料规格和测试方法，重点是弯曲钢筋(在非典型制造条件下制造的钢筋)的机械性能、粘结性能和耐久性。与当前GFRP标准所基于的简化的单一载荷水平试验相比，也解决了不寻常的载荷条件，如桩强度。提出了一种基于性能的短期和长期抗力描述方法来描述极限状态和实际安全裕度。因此，这项工作的主要目标是提供有关建筑用GFRP筋的安全强度水平的信息和设计建议。