Realistic Laboratory Rolling Loading of Bridge Superstructure built using Novel Technologies Combined with Environmental Exposure

采用新技术与环境暴露相结合建造的桥梁上部结构的真实实验室滚动荷载

• 批准号: RGPIN-2017-04196
• 负责人: Fam, Amir
• 金额: $ 3.72万
• 依托单位: Queen's University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2019
• 资助国家: 加拿大
• 起止时间: 2019-01-01 至 2020-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=690273
• 关键词: Realistic; Laboratory; Rolling; Loading; Bridge

Bridges are essential links in our transportation networks. The health of these structures has a significant impact on economy bec's 12,000 bridges, need retrofitting or replacement******This project aims to establish a rigorous framework of research to study bridge decks & girders under moving (rolling) loads and environmental effects. The concept is highly original and innovative as it closely simulates traffic. Traditional testing is usually through 'pulsating' loading (loading & unloading repeatedly at the same spot), but is shown by some studies to overestimate the number of loading cycles to failure, which is not conservative. This research is enabled by a large scale Moving Load Simulator, 18 m long (the first and only in Canada), recently developed & built using federal & provincial funds awarded to the applicant and colleagues.*These unique experiments will be complemented by theoretical analysis using finite element & service life models. The research will provide insight into the fundamental differences between pulsating and rolling loads, in terms of their effects on stiffness degradation, crack development & fatigue life of bridges. Bridge decks with various construction materials & methods will be studied. The combined effect of rolling loads & exposure to freeze-thaw or salt spray will be examined. The effect of rolling load on shear strength and lateral load distribution of girders will be studied. Also, expansion joints & dynamic effects will be studied******The proposed research seeks to create a paradigm shift in the way bridges are tested to allow for a much more robust understanding of bridge performance. It will help establishing Canada as a world leader in bridge engineering & bridge management policy, by using the wealth of knowledge and data collected from this research to revise design & construction guidelines for bridge authorities, designers & contractors to better reflect actual performance of bridges. Ultimately this will lead to more efficient use of resources & tax dollars, enhanced accuracy of bridge ratings and reduced travel and delay times******During the funding period, 5 PhD, 6 MSc & 12 undergrad students will be trained as future engineers capable of transferring knowledge from the lab to the field with confidence and enthusiasm. Training involves critical thinking, problem solving, hands on experience, lab testing, data analysis, computer modeling, technical writing, presenting, team work & networking with industry partners. The applicant's former HQP have had remarkable careers (7 became professors with one Canada Research Chair & the rest were all hired by top industries, including Arup-New York, Halsall & Trans-Canada)*****

桥梁是我们交通网络中必不可少的环节。这些结构的健康状况对经济产生重大影响，因为有 12,000 座桥梁需要改造或更换******该项目旨在建立严格的研究框架，以研究移动（滚动）载荷和环境影响下的桥面和梁。这个概念非常原始和创新，因为它紧密地模拟了交通。传统的测试通常是通过“脉动”加载（在同一地点重复加载和卸载），但一些研究表明高估了失效的加载循环次数，这并不保守。这项研究是通过一个大型移动负载模拟器实现的，该模拟器长 18 m（加拿大第一个也是唯一一个），最近使用授予申请人和同事的联邦和省资金开发和建造。*这些独特的实验将通过使用有限元和使用寿命模型的理论分析得到补充。该研究将深入了解脉动载荷和滚动载荷之间的根本差异，以及它们对桥梁刚度退化、裂纹发展和疲劳寿命的影响。将研究采用各种建筑材料和方法的桥面。将检查滚动载荷和暴露于冻融或盐雾的综合影响。研究滚动荷载对梁抗剪强度和横向荷载分布的影响。此外，还将研究伸缩缝和动态效应*****拟议的研究旨在改变桥梁测试方式，以便对桥梁性能有更深入的了解。它将利用从这项研究中收集的丰富知识和数据来修订桥梁当局、设计师和承包商的设计和施工指南，以更好地反映桥梁的实际性能，从而帮助加拿大成为桥梁工程和桥梁管理政策的世界领导者。最终，这将提高资源和税金的利用效率，提高桥梁评级的准确性，并减少出行和延误时间*****在资助期间，5名博士生、6名硕士生和12名本科生将接受培训，成为未来的工程师，能够满怀信心和热情地将知识从实验室转移到现场。培训涉及批判性思维、解决问题、实践经验、实验室测试、数据分析、计算机建模、技术写作、演示、团队合作以及与行业合作伙伴的联系。申请人的前 HQP 有着非凡的职业生涯（7 名成为教授，其中一名加拿大研究主席，其余均受聘于顶级行业，包括 Arup-New York、Halsall 和 Trans-Canada）*****