Short-term and long-term behaviour of GFRP bars and bends

2010年全球钢铁腐蚀造成的经济总成本估计为2.2万亿美元，约占全球GDP的3% （Hays 2010）。作为这种破坏的一部分，混凝土结构中钢筋的腐蚀造成了巨大的困难，因为在许多情况下，腐蚀已经达到了不安全的程度，维修费用已经增加到数十亿美元。加拿大两个明显的例子是大城市多伦多和蒙特利尔日益恶化的桥梁。在混凝土结构中最可行的钢筋替代品是玻璃纤维增强聚合物（GFRP）。该建议涉及在混凝土基础设施中使用玻璃钢作为内部钢筋。近期的短期试验工作表明，gfrp -钢筋混凝土构件性能优异，但关于其长期性能的现有信息严重有限。该项目的目标是为开发寿命为100年或更长时间的gfrp增强结构的合理设计指南提供信息。混凝土结构中的钢筋要承受如此长寿命的持续载荷。目前还没有可靠的模型来确定这些材料的失效时间。拟议的工作将调查GFRP直杆和弯杆在不同水平的持续载荷下的这个问题，制定合理的模型和设计指南，可以帮助我们建立可持续的基础设施。这项工作将与结构设计公司和玻璃钢制造商的专家合作进行。加拿大从这项工作中获得的额外好处将包括工程师培训，混凝土设计规范和手册指南的制定，以及为加拿大公司和工程师提供使用最先进的研究和新兴技术进行结构设计的全球竞争优势。

The total cost to the economy due to corrosion of steel worldwide in 2010 was estimated at USD $2.2 trillion which is about 3% of the world's GDP (Hays 2010). As part of this damage, corrosion of steel reinforcement in concrete structures is causing enormous hardships as deterioration has reached unsafe levels in many cases and repair costs have mounted to billions of dollars. Two obvious examples of this in Canada are the deteriorating bridges in the largest cities, Toronto and Montreal. A most feasible alternative to steel reinforcement in concrete structures is Glass Fiber Reinforcing Polymers (GFRP). This proposal relates to the use of GFRP as internal reinforcement in concrete infrastructure. The recent work on short term tests has shown excellent performance of GFRP-reinforced concrete components but available information on their long-term performance is seriously limited. The objective of this project is to generate information for developing rational design guidelines for GFRP-reinforced structures with life spans of 100 years or longer. Reinforcement in concrete structures is subjected to sustained loads for this long life. There are no dependable models that allow determination of time to failure for these materials. The proposed work will investigate this issue for GFRP straight bars and bent bars under various levels of sustained loads, develop rational models and design guidelines that can help us build sustainable infrastructure. This work will be carried out in collaboration with experts from structural design companies and GFRP manufacturers. Additional benefits for Canada from this work will include training of engineers, development of guidelines for concrete design codes and manuals as well as providing Canadian companies and engineers with a global competitive edge for the design of structures using the state-of-the-art research and emerging technologies.