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

加拿大的大部分桥梁库存已经超过或接近其使用寿命。这种桥梁倒塌的风险很高，特别是在易受极端自然事件影响的地区，这在很大程度上是由于气候变化的影响而变得更加频繁。放弃桥梁（完全或部分关闭，限制通行）将严重影响区域的运营。用新的结构取代有缺陷的桥梁将需要大量的投资，也会产生大量的碳排放。因此，改装将是减少风险的更安全的方法。有限的财政资源加上加拿大有缺陷桥梁的持续急剧增加，需要采取大胆的行动，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-工业合作通过两条轨道应对上述挑战。第一个重点是开发一个系统的程序，使用基于性能的原则，以确定和优先考虑的桥梁，需要进行评估的抗震改造。第二条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清单。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，创新的桥梁改造/维修措施的前景将通过实验方案和广泛的数值模拟相结合进行评估。将制定基于生命周期成本和性能的综合设计指南，以确保拟议的新措施在实践中可实施。研究小组会与设计守则委员会紧密合作，制订适当的架构，以便把建议的设计建议和指引纳入设计守则内。

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.