Bond performance of FRP bars in concrete under monotonic, cyclic and fatigue loading

恶劣的环境和腐蚀导致的钢骨混凝土基础设施的恶化是加拿大建筑业面临的重大挑战之一。因此，工程公司的目标是设计更强大、更持久、更耐腐蚀、建造和维护成本更低、以及在极端负载事件中具有弹性的基础设施系统。提高结构使用寿命的一个可行方案是使用耐腐蚀材料，如高性能纤维增强聚合物(FRP)复合材料。虽然最近发表了大量关于玻璃纤维增强聚合物(GFRP)筋的粘结性能的研究，但在循环和疲劳载荷下的粘结性能方面，文献中还存在空白。本次合作研发项目的主要目的是评估GFRP筋在不同条件下的完整粘结滑移关系。该项目将从实验和数值上量化关键影响因素，即钢筋直径、表面涂层、表面结构、加载类型和这些因素的适当组合对粘结滑移行为的影响。这将有助于玻璃钢制造企业进一步改善其玻璃钢产品的特性，提高其长期粘结性能，并帮助工程师和利益相关者更确定地利用这项创新技术。这些发现将有助于制定结构的设计指南和限制。这项拟议的研究将与玻璃钢制造公司、设计公司和基础设施所有者的专家合作进行，以产生新的和补充的实验和分析基础知识、实践进展、规范设计规定和规范性详细要求。加拿大的其他好处将包括HQP的培训，在使用最先进的研究和新兴技术设计结构方面具有全球竞争优势。

The deterioration of steel-reinforced concrete infrastructure due to the harsh environment and corrosion is one of the significant challenges facing the Canadian construction industry. Therefore, engineering firms aim for designing infrastructure systems that are stronger, last longer, are more resistant to corrosion, cost less to build and maintain, as well as being resilient in case of extreme loading events. A feasible solution to increase the service life of structures is to use corrosion-resistant materials, such as high-performance fibre-reinforced polymer (FRP) composites. While there have been a multitude of studies recently published on the bond properties of some glass fibre-reinforced polymer (GFRP) bars, there is a gap in the literature with respect to the bond behaviour under cyclic and fatigue loading. The main objective of this collaborative research and development project is to evaluate the complete bond-slip relationship of GFRP bars under various conditions. The project will quantify, experimentally and numerically, the effect of critical influencing factors, namely, bar diameter, surface coatings, surface configuration, loading type and suitable combinations of these factors, on the bond-slip behaviour. This will assist FRP manufacturing companies to improve the characteristics of their FRP products further, enhance their long-term bond performance, and help engineers and stakeholders to utilize this innovative technology with greater certainty. The findings will help develop design guidelines and limitations for structures. This proposed research will be carried out in collaboration with experts from GFRP manufacturing companies, design firms, and infrastructure owners to generate new and complementary experimental and analytical fundamental knowledge, practical advancements, code design provisions, and prescriptive detailing requirements. Additional benefits for Canada will include training of HQP, with a global competitive edge for the design of structures using the state-of-the-art research and emerging technologies.