A comprehensive study on enhancing the fire resistance of Glass Fiber-Reinforced Polymer (GFRP) reinforced concrete columns and slabs

增强玻璃纤维增强聚合物（GFRP）钢筋混凝土柱和板耐火性能的综合研究

基本信息

批准号：
580337-2022
负责人：
Hajiloo, HamzehH
金额：
$ 2.19万
依托单位：
Carleton University
依托单位国家：
加拿大
项目类别：
Alliance Grants
财政年份：
2022
资助国家：
加拿大
起止时间：
2022-01-01 至 2023-12-31
项目状态：
已结题

来源：
https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=748943
关键词：
comprehensive study enhancing fire resistance

项目摘要

This project aims to provide a holistic investigation of Glass fibre reinforced polymer (GFRP) reinforced concrete members in fire, namely columns and slabs. This research will have three main experimental phases: (1) standard pullout tests on MST bars in an environmental chamber; (2) intermediate and full-scale standard fire tests will be conducted on GFRP-reinforced concrete slabs with intumescent coating at the ends of the slabs; and (3) a full-scale column entirely reinforced with GFRP bars will be tested under standard fire for the first time in North America. To date, the loss and degradation of bond strength of FRP reinforcing bars at high temperatures has been identified as the main cause of the inferior fire performance of FRP-reinforced concrete (RC) elements compared to steel RC ones. The test results have revealed that if temperatures at both ends of an FRP bar remain below its glass transition temperature the bond failure of the FRP RC member will significantly improve. To achieve this, the anchorage zones in FRP RC members are recommended to be protected from direct fire exposures to delay the temperature propagation into the embedded FRP reinforcing bars at the anchorage zones. Recently, the application of intumescent coatings with very thin layers has shown promising results with delayed temperature propagation into the concrete. The thin-film intumescent coatings greatly protect structural elements against severe temperatures that can occur in fires. The intumescent coatings are an easy-to-apply and cost-effective alternative to conventional passive fire protection layers. The previously mentioned tests will be used to examine the performance of GFRP reinforced concrete columns, as well as the behaviour of GFRP stirrups and GFRP longitudinal bars during a fire. Through this partnership, MST Rebar will be confident in the fire resistance of GFRP RC columns and offer practical measures to enhance the fire resistance of GFRP RC slabs. Canadian codes, such as CSA-S806, are specifically developed to promote GFRP RC structures. The outcome of this research will provide knowledge in developing provisions for CSA-S806 in Canada.

该项目旨在对玻璃纤维增强聚合物（GFRP）钢筋混凝土成员进行全面研究，即圆柱和平板。这项研究将有三个主要的实验阶段：（1）在环境室中的MST杆上进行标准拔出测试；（2）将在GFRP增强的混凝土板上进行中间和全尺度标准火灾测试，并在板的末端具有浓郁的涂层；（3）在北美，将首次在标准火灾下测试完全用GFRP杆加固的全尺度柱。迄今为止，与钢RC相比，FRP增强条的粘结强度的损失和降解已被确定为FRP增强混凝土（RC）元素较低火力性能的主要原因。测试结果表明，如果FRP棒两端的温度保持在其玻璃过渡温度以下，则FRP RC成员的键失败将显着提高。为了实现这一目标，建议保护FRP RC成员中的锚固区域免受直接火势的保护，以将温度传播延迟到锚固区域的嵌入式FRP增强杆中。最近，具有非常薄的层的Intement涂层的应用显示出令人鼓舞的结果，温度延迟到混凝土中。薄膜的发光涂层极大地保护结构元素免受火灾中可能发生的严重温度。散发涂层是传统的被动防火层的易于搭配且具有成本效益的替代品。前面提到的测试将用于检查GFRP钢筋混凝土柱的性能，以及在火灾期间GFRP马rup和GFRP纵向条的行为。通过这种合作伙伴关系，MST Rebar将对GFRP RC列的火力阻力充满信心，并提供实用的措施，以增强GFRP RC板的防火性。加拿大代码（例如CSA-S806）是专门为促进GFRP RC结构而开发的。这项研究的结果将为加拿大CSA-S806的规定提供知识。