Fire performance of durable concrete structures reinforced with Fibre Reinforced Polymer (FRP) bars

更换大量腐烂和摇摇欲坠的建筑物的财政负担和环境影响是繁重的。水泥行业每年生产超过40亿吨水泥，占全球二氧化碳排放量的8%。对气候变化的最高关注，要求土木工程社会寻求更可持续，耐用和持久的建筑材料和方法。纤维增强聚合物（FRP）加固是钢筋混凝土（RC）结构中易腐蚀钢筋的可行替代方案。人们对FRP加固混凝土构件的常温性能有了充分的认识，FRP加固已成功地应用于许多混凝土结构中。然而，目前对FRP混凝土结构在火灾中的耐火性能缺乏全面的认识。现有的知识严重缺乏广泛的实验和数值研究，最终将允许走向产生合理的，实用的和详细的设计指南的FRP钢筋混凝土结构的防火安全。该提案支持全面的研究计划，其总体目标是对FRP加固混凝土构件和结构的结构性能进行深入和基本的了解。本研究计划的长期目标是对FRP RC结构的防火安全设计有一个基本的了解，从而使FRP RC结构的防火安全设计更合理、更符合性能要求。该计划旨在确保FRP RC的消防安全和公共安全，然后才能最终进行大规模FRP RC建设。为实现长期目标，近期的具体目标是：（1）进一步研究高温下FRP筋的粘结性能，研究玻璃化温度对FRP筋粘结性能的影响;（2）开展FRP筋混凝土构件的中、大型火灾试验;及（3）将模拟能力由单一构件水平扩展至更复杂的结构水平，以检查火灾中的全框架反应。这项研究计划的实际意义将服务于加拿大以及国际代码（如ACI 440.1R）的关键更新的需求。加拿大一直在制定FRP加固规定（例如CSA-S6和CSA-S806）方面发挥主导作用，这些规范在世界各地使用。CSA-S806对FRP混凝土板的防火安全设计有着独特的详细规定，需要朝着更合理和基于性能的设计方法发展。现行的规范性设计指南建议加厚混凝土保护层，这降低了设计效率，并需要使用大量昂贵的FRP。该研究项目将培养9名HQP，他们将成为加拿大未来的专业工程师和研究人员，以满足结构防火安全要求。

The financial burden and the environmental impacts of replacing a large number of decaying and crumbling structures are onerous. With over 4 billion tons of cement produced annually, the cement industry produces 8% of global CO2 emissions on the planet. The highest-ever concerns regarding climate change and demands civil engineering society to seek more sustainable, durable, and long-lasting construction materials and methods. Fibre Reinforced Polymer (FRP) reinforcement is a viable alternative for the corrosion-prone steel reinforcement in reinforced concrete (RC) structures. There is adequate knowledge on FRP RC structural members at ambient temperature, and FRP reinforcement has been successfully used in many concrete structures. However, there is a lack of a holistic understanding of the fire performance of FRP RC structures in fires. The existing knowledge critically lacks extensive experimental and numerical studies which would ultimately allow moving towards generating rational, practical and detailed design guidelines for fire safety of FRP RC structures. This proposal supports a comprehensive research program with the overarching objective of achieving an in-depth and fundamental understanding of the structural performance of FRP reinforced concrete members and structures. The long-term objective of the proposed research program is to gain fundamental understandings leading to rational and performance-based fire safety design of FRP RC structures. This program aims to ensure the fire safety of FRP RC and public safety before massive FRP RC constructions can finally be undertaken. To accomplish the long-term goals, the specific short-term objectives are to: (1) further characterize the bond behaviour of FRP reinforcing bars at high temperatures and investigate the effects of higher glass transition temperature on the bond performance; (2) conduct medium and large-scale fire tests on FRP RC structural components; and (3) extend the modelling capabilities from single-member level to a more sophisticated structural level to examine the full-frame response in fire. The practical implications of this research program will serve the needs of Canadian as well as international codes (e.g. ACI 440.1R) for key updates. Canada has always held a leading role in developing provisions for FRP reinforcement (e.g. CSA-S6 and CSA-S806), and these codes are used around the world. The CSA-S806 uniquely has detailed provisions for fire safety design of FRP RC slabs which need to be directed towards more rational and performance-based design approaches. The current and prescriptive design guidelines recommend the thickening of concrete cover which lowers the design efficiency and requires a substantial amount of expensive FRP to be used. This research program will train 9 HQP, and they will be the future's professional engineers and researchers in Canada to fulfill the structural fire safety requirements.