Performance-based design of bridge retrofitting with novel techniques considering life-cycle analysis

基于性能的桥梁改造新技术考虑生命周期分析的设计

• 批准号: 570565-2021
• 负责人: Alam, ShahriaS
• 金额: $ 10.49万
• 依托单位: University of British Columbia
• 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=761706
• 关键词: Performance; based; design; bridge; retrofitting

A large portion of the bridge inventory in Canada has either passed or is approaching its end of service life. Such bridges are at high risk of collapse especially in regions prone to extreme natural events, which are becoming more frequent in large part due to the influence of climate change. Abandoning the bridge (total or partial closure with restricted access) will significantly affect the operation of a region. Replacing deficient bridges with new structures would require substantial investment and also impose significant carbon emission. Hence, retrofitting would be the safer method of mitigating risks. The limited financial resources coupled with the continuous drastic increase of deficient bridges in Canada calls for bold actions which can only be achieved through systematic, well-designed, and implementable research. The proposed academic-industrial collaboration addresses the above challenges through two tracks. The first one focuses on developing a systematic procedure that uses performance-based principles to identify and prioritize bridges that need to be evaluated for seismic retrofitting. The second track focuses on introducing innovative cost-effective bridge retrofit and repair measures and the development of performance-based design guidelines by integrating lifecycle and lifecycle cost analysis. The first phase of this project will deal with the inventory of all publicly owned bridges. Based on the data in the database, detailed evaluations of the bridge conditions will be performed using performance-based assessment. In the next phase, the prospect of innovative bridge retrofitting/repairing measures will be evaluated by a combination of experimental programs and extensive numerical simulations. Integrated lifecycle cost and performance-based design guidelines will be developed to ensure that the proposed novel measures are implementable in practice. The research team will work closely with the design code committee to formulate the appropriate framework with which the proposed design recommendations and guidelines can be incorporated into the design codes.

加拿大的大部分桥梁库存已经超过或即将达到其使用寿命。此类桥梁崩塌的风险很高，特别是在容易发生极端自然事件的地区，这些事件在很大程度上由于气候变化的影响而变得更加频繁。放弃桥梁（全部或部分关闭并限制通行）将严重影响一个地区的运作。用新结构取代有缺陷的桥梁需要大量投资，并且还会产生大量碳排放。因此，改造将是降低风险的更安全的方法。有限的财政资源加上加拿大缺陷桥梁的不断急剧增加，需要采取大胆的行动，而这只能通过系统的、精心设计的和可实施的研究来实现。拟议的学术-工业合作通过两个途径解决上述挑战。第一个重点是开发一个系统程序，该程序使用基于性能的原则来识别和优先考虑需要评估抗震改造的桥梁。第二个轨道的重点是引入创新的、具有成本效益的桥梁改造和维修措施，并通过整合生命周期和生命周期成本分析来制定基于性能的设计指南。该项目的第一阶段将处理所有公有桥梁的库存。根据数据库中的数据，将使用基于性能的评估对桥梁状况进行详细评估。在下一阶段，将通过实验计划和广泛的数值模拟相结合来评估创新桥梁改造/修复措施的前景。将制定综合生命周期成本和基于性能的设计指南，以确保所提出的新措施在实践中可实施。研究团队将与设计规范委员会密切合作，制定适当的框架，将拟议的设计建议和指南纳入设计规范中。