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

使用纤维增强聚合物 (FRP) 棒加固的耐用混凝土结构的防火性能

• 批准号: RGPIN-2020-06312
• 负责人: Hajiloo, Hamzeh
• 金额: $ 1.89万
• 依托单位: Carleton University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2020
• 资助国家: 加拿大
• 起止时间: 2020-01-01 至 2021-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=717748
• 关键词: Fire; performance; durable; concrete; structures

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.

更换大量腐烂和摇摇欲坠的结构所带来的财政负担和环境影响是沉重的。水泥行业的年产量超过40亿吨，占全球二氧化碳排放量的8%。对气候变化的最高关注，要求土木工程学会寻求更可持续、更耐用、更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一种可行的替代方案。人们对常温下的FRP钢筋混凝土构件有足够的了解，FRP加固已经成功地应用于许多混凝土结构中。然而，对FRP-RC结构在火灾中的耐火性能缺乏全面的了解。现有的知识严重缺乏广泛的实验和数值研究，最终将有助于为FRP RC结构的消防安全制定合理、实用和详细的设计指南。 这项建议支持一个全面的研究计划，总体目标是实现对FRP钢筋混凝土构件和结构的结构性能的深入和基本的了解。该研究计划的长期目标是获得基本的认识，从而实现合理的、基于性能的FRP结构的防火安全设计。该计划旨在确保FRP RC的消防安全和公共安全，然后才能进行大规模的FRP RC施工。为了实现长期目标，具体的短期目标是：(1)进一步表征高温下FRP钢筋的粘结性能，并研究较高的玻璃化转变温度对粘结性能的影响；(2)对FRP结构构件进行中型和大型火灾试验；以及(3)将模拟能力从单一构件水平扩展到更复杂的结构水平，以检查整个框架在火灾中的反应。 该研究计划的实际影响将满足加拿大和国际规范(例如ACI 440.1R)对关键更新的需求。加拿大在制定FRP加固条款(如CSA-S6和CSA-S806)方面一直处于领先地位，这些规范在世界各地使用。CSA-S806独一无二地对FRP RC板的防火安全设计作出了详细的规定，需要朝着更合理和基于性能的设计方法发展。现行和规定的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玻璃钢。这项研究计划将培养9名HQP，他们将是未来加拿大满足结构消防安全要求的专业工程师和研究人员。