Fatigue Assessment of Retrofitted Bridge Welds in the High Cycle Domain

高循环领域改造桥梁焊缝的疲劳评估

• 批准号: 341305-2012
• 负责人: Walbridge, Scott
• 金额: $ 1.38万
• 依托单位: University of Waterloo
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2016
• 资助国家: 加拿大
• 起止时间: 2016-01-01 至 2017-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=595366
• 关键词: Fatigue; Assessment; Retrofitted; Bridge; Welds

Recent reports have quantified the significant maintenance costs facing bridge owners, with numbers ranging from $2.2 billion for the Province of Ontario to $140 billion for the entire bridge stock in the US. In order to minimize these costs, new retrofitting methods are being developed for extending the service lives of bridges, including: the use of fatigue performance enhancing post-weld treatments, strengthening with fibre-reinforced polymer (FRP) materials, and deck replacement using lighter materials such as aluminum. In assessing the durability of these retrofitting methods, fatigue remains a central issue. For these methods to be safely implemented on a routine basis, there is a need for further research to: 1) verify their long term performance under in-service variable amplitude (VA) loading conditions, and 2) develop improved predictive models to gain insight regarding behaviour and facilitate optimal retrofit planning and design.

最近的报告量化了桥梁业主面临的重大维护成本，从安大略省的22亿美元到美国整个桥梁存量的1400亿美元不等。为了最大限度地降低这些成本，正在开发新的改造方法来延长桥梁的使用寿命，包括：使用疲劳性能增强焊后处理，用纤维增强聚合物（FRP）材料加固，以及使用铝等轻质材料更换桥面。在评估这些改装方法的耐久性时，疲劳仍然是一个核心问题。为了使这些方法在常规基础上安全实施，需要进一步研究：1）验证其在使用中变幅（VA）负载条件下的长期性能，2）开发改进的预测模型，以了解行为并促进最佳改造规划和设计。