New bridge construction using an innovative hybrid FRP-UHP concrete deck systems

使用创新的混合 FRP-UHP 混凝土桥面系统的新桥梁施工

• 批准号: 299066-2010
• 负责人: ElHacha, Raafat
• 金额: $ 1.6万
• 依托单位: University of Calgary
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2014
• 资助国家: 加拿大
• 起止时间: 2014-01-01 至 2015-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=548383
• 关键词: New; bridge; construction; using; innovative

Bridge superstructures consist of concrete or steel girders topped with a reinforced concrete (RC) deck. In harsh environments, such as those found in northern US or Canadian climates, a highly corrosive environment develops in the decks, attributed to the heavy use of deicing salt during winter weather. The development of Ultra High Performance Concrete (UHPC) provides engineers the opportunities of a new level of design to create thinner sections with high strength and longer design life. The use of UHPC for construction is simplified through the elimination of reinforcing steel by adding organic or steel fibers to the mix. As emerging materials, Fibre Reinforced Polymer (FRP) composites have been introduced as attractive materials for new construction as a substitute for steel. An FRP bridge deck system could weigh about 20% of a similar RC deck. However, in spite of the advantages offered by FRP (such as high-strength to weight ratio, corrosion resistant, etc.,), the higher initial construction cost of full FRP bridge deck systems (relative to RC deck) is still one of the major obstacles for wide-spread adoption of FRPs in the bridge construction market. Therefore, it is essential to develop cost-effective high-performance structural systems that take full advantage of the unique properties of FRP composites and the distinctive properties of UHPC in the form of hybrid construction system. The proposed hybrid FRP-UHP concrete section consists of a thin-walled Glass FRP pultruded hollow box section combined with a thin layer of UHP concrete cast in the compression zone and a thin Carbon FRP or Steel FRP sheets bonded in the tension zone. The high stiffness and strength section could weigh about 1/3 of an equivalent RC member that allows for rapid deployment and installation at the job site. This research program will investigate the performance of the proposed system under static, fatigue, and long-term loading at room and low temperatures. This research will bring a new technology to the industry that permits the use and construction of durable hybrid bridge deck systems that have the potential to replace conventional concrete bridge decks on steel girders, or to serve as a self-supported short span bridge superstructure.

桥超结构由混凝土或钢梁组成，上面是钢筋混凝土（RC）甲板。在恶劣的环境中，例如在美国北部或加拿大气候下发现的环境，在甲板上发展了高度腐蚀性的环境，这归因于在冬季天气中大量使用盐分。超高性能混凝土（UHPC）的开发为工程师提供了新的设计级别的机会，以创建具有高强度和更长设计寿命的更薄部分。通过在混合物中添加有机或钢纤维来消除钢筋，可以简化UHPC进行施工。作为新兴材料，已将纤维增强聚合物（FRP）复合材料作为新建材料引入，以替代钢。 FRP桥甲板系统可能重量约为类似RC甲板的20％。 但是，尽管FRP提供的优势（例如，重量比，耐腐蚀等），但全FRP桥甲板系统的较高初始施工成本（相对于RC甲板）仍然是FRP在桥梁建筑市场中广泛采用的主要障碍之一。因此，必须开发具有成本效益的高性能结构系统，以充分利用FRP复合材料的独特特性以及在混合构建系统的形式下具有独特的UHPC特性。所提出的混合FRP-UHP混凝土截面由薄壁的玻璃FRP Pultruded Hollow Box截面组成，并在压缩区结合了薄层的UHP混凝土层和一个薄的碳FRP或钢FRP，在张力区粘合了。高刚度和强度部分的重量约为1/3等效的RC成员，该成员可以在工作现场进行快速部署和安装。该研究计划将调查拟议系统在静态，疲劳和长期负载下在房间和低温下的性能。这项研究将为行业带来一项新技术，该技术允许使用和构建耐用的混合桥甲板系统，该系统有可能取代钢梁上的常规混凝土桥甲板，或者用作自支持的短跨度桥超结构。