FRP/UHPFRC Composite Structural Systems for Elevated Rail Transit Structures

高架轨道交通结构用 FRP/UHPFRC 复合结构系统

• 批准号: RGPIN-2014-05755
• 负责人: Gauvreau, Paul
• 金额: $ 1.6万
• 依托单位: University of Toronto
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2018
• 资助国家: 加拿大
• 起止时间: 2018-01-01 至 2019-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=651634
• 关键词: FRP; UHPFRC; Composite; Structural; Systems

The long-term goal of the proposed research is to develop a new type of lightweight girder suitable for elevated structures carrying light rail transit. The proposed single-cell box girder uses fibre reinforced polymer (FRP) and ultra high-performance fibre reinforced concrete (UHPFRC) acting compositely. Composite action enables each material to mitigate shortcomings in the other while maintaining its own intrinsic advantages, making possible a prefabricated system that is economical, easy and fast to construct using conventional means, durable, and which offers aesthetic possibilities superior to structural systems currently used.**The short-term goals seek to fill the following gaps in knowledge necessary to validate the proposed system: **1. Develop and validate a reliable means of transferring shear force along the interface between FRP and UHPFRC to ensure that both materials can work together at all levels of load**2. Characterize the fatigue resistance of the UHPFRC/FRP composite. Rail transit structures are subject to significant cycles of stress due to the passage of trains. It is necessary to ensure that the composite material will not undergo significant progressive damage due to these cyclic stresses.**3. Characterize the intrinsic damping of the UHPFRC/FRP composite. Rail transit structures must be designed to minimize vibrations, for the comfort of passengers and to ensure proper operation of vehicles. To provide an adequate basis for design, a proper quantification of the intrinsic damping of the material is required.**4. Develop critical structural details for structural continuity and validate the design concept over a representative range of spans and curvatures.**Due to its light weight, efficient consumption of materials, and ease of construction relative to other recently used structural systems, the proposed girder offers many possibilities for cost savings. The most important of these include a significant reduction in labour for both fabrication and erection, reduction in the size and reinforcement of piers and foundations due both to reductions in dead load reaction as well as reduced seismic vulnerability due to its extreme light weight. The proposed research thus has the potential to bring about a significant reduction in the capital costs of light rail systems and thus to encourage the creation and expansion of rapid transit networks in Canadian cities.

本研究的长期目标是开发一种适用于承载轻轨交通的高架结构的新型轻质梁。提出的单孔箱梁采用纤维增强聚合物（FRP）和高性能纤维增强混凝土（UHPFRC）复合作用。复合作用使每种材料在保持其自身固有优势的同时减轻了其他材料的缺点，使预制系统成为可能，这种预制系统使用传统方法建造经济、简单、快速、耐用，并且提供了优于当前使用的结构系统的美学可能性。**短期目标旨在填补验证拟议系统所必需的以下知识空白：开发并验证沿FRP和UHPFRC界面传递剪切力的可靠方法，以确保两种材料可以在所有水平的荷载下协同工作**2。表征UHPFRC/FRP复合材料的抗疲劳性能。轨道交通结构由于列车的通过而受到显著的应力循环。有必要确保复合材料不会因这些循环应力而遭受明显的渐进损伤。表征UHPFRC/FRP复合材料的固有阻尼。轨道交通结构的设计必须将振动降到最低，以确保乘客的舒适，并确保车辆的正常运行。为了给设计提供充分的依据，需要对材料的本征阻尼进行适当的量化。开发结构连续性的关键结构细节，并在具有代表性的跨度和曲率范围内验证设计概念。**由于其重量轻，材料的有效消耗，以及相对于其他最近使用的结构系统易于施工，建议的梁提供了许多节省成本的可能性。其中最重要的是大大减少了制造和安装的劳动力，由于减少了恒载反应，减少了桥墩和基础的尺寸和加固，以及由于其极轻的重量而降低了地震脆弱性。因此，拟议的研究有可能大大减少轻轨系统的资本成本，从而鼓励在加拿大城市建立和扩大快速运输网络。