Seismic fragility, loss, and resilience assessment of Canada's bridge infrastructure

加拿大桥梁基础设施的地震脆弱性、损失和复原力评估

• 批准号: RGPIN-2020-04156
• 负责人: Xie, Yazhou
• 金额: $ 1.89万
• 依托单位: McGill University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2020
• 资助国家: 加拿大
• 起止时间: 2020-01-01 至 2021-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=715689
• 关键词: Seismic; fragility; loss; resilience; assessment

Both southwestern British Columbia (BC) and St. Lawrence Valley are at significant risk of a strong earthquake. Bridge structures in these regions are seismically vulnerable due to aging and deterioration, outdated design and deferred maintenance. For example, nearly 40% of BC highway bridges were built before the first probabilistic seismic hazard map has been developed [1]. Moreover, the transportation infrastructure in BC and Quebec consists of a diverse collection of bridges that vary in material, type, connectivity, geometry and design details. Given the complexity, existing research falls short of providing a comprehensive, consistent and reliable seismic assessment of the bridge inventories in West and East Canada. The proposed program aims to enhance the seismic resilience of Canada's transportation infrastructure. An integrated framework to assess the seismic fragility, loss and resilience of regional bridge systems in BC and Quebec will be developed to achieve this goal. First, high-resolution bridge inventory databases will be built by surveying a large number of drawing files from British Columbia Ministry of Transportation and Infrastructure (BCMoT) and Transports Quebec (MTQ), respectively. Second, high-fidelity response and capacity models will be developed in OpenSees (an open access software for seismic analysis) for various types of bridge components that incorporate nonlinear behaviours, design variations and different sources of uncertainties. Third, machine learning tools will be developed to group bridges with similar seismic performance, through which the bridge inventory will be sub-divided into several representative bridge systems (RBSs). Class fragilities and parameterized fragility models will be derived to represent the damage potential of grouped and individual bridges, respectively. Last, a web-based survey will be devised to quantify the relationships between component damage and expected seismic losses due to closure decisions and repair procedures. Response data from the survey will be utilized to perform seismic loss and resilience assessment for each RBS. The success of this program will bear a profound impact on the improvement of current design practices and provide bridge engineers with improved situational awareness on the seismic risk of Canada's bridge infrastructure. The proposed research will enable a more effective post-hazard emergency response and a faster restoration of network mobility. It will support planning, retrofit and risk mitigation decisions regarding the allocation of limited resources to maximize the seismic resilience of bridge networks. The developed frameworks and methodologies can be congruently applied to other structural systems when subjected to different types of natural hazards. The research will provide interdisciplinary training for HQP and an opportunity to teach a diverse student body about the role of science and engineering in improving the infrastructure resilience.

西南部的不列颠哥伦比亚省（BC）和圣劳伦斯河谷都有发生强烈地震的重大风险。这些地区的桥梁结构由于老化和退化、过时的设计和推迟的维修而容易受到地震的影响。例如，不列颠哥伦比亚省近40%的公路桥梁是在第一张概率地震危险图开发出来之前建造的[1]。此外，不列颠哥伦比亚省和魁北克的交通基础设施由各种各样的桥梁组成，这些桥梁在材料、类型、连接性、几何形状和设计细节上各不相同。考虑到复杂性，现有研究福尔斯无法对加拿大西部和东部的桥梁库存进行全面、一致和可靠的地震评估。 该计划旨在提高加拿大交通基础设施的抗震能力。为实现这一目标，将制定一个综合框架，评估不列颠哥伦比亚省和魁北克地区桥梁系统的地震脆弱性、损失和恢复力。首先，将通过测量分别来自不列颠哥伦比亚省交通和基础设施部（BCMoT）和运输部魁北克（MTQ）的大量图纸文件，建立高分辨率桥梁库存数据库。其次，将在OpenSees（一种开放式地震分析软件）中为各种类型的桥梁构件开发高保真度响应和能力模型，这些构件包括非线性行为、设计变化和不同的不确定性来源。第三，将开发机器学习工具来对具有类似抗震性能的桥梁进行分组，通过该工具，桥梁库存将被细分为几个代表性的桥梁系统（RBS）。类脆弱性和参数化的脆弱性模型将分别代表分组和单个桥梁的损坏潜力。最后，将设计一个基于网络的调查，以量化组件损坏和预期地震损失之间的关系，由于关闭的决定和维修程序。调查的响应数据将用于对每个RBS进行地震损失和恢复力评估。 该计划的成功将对改善目前的设计实践产生深远的影响，并为桥梁工程师提供加拿大桥梁基础设施地震风险的改进情况意识。拟议的研究将使更有效的灾后应急响应和更快地恢复网络的流动性。它将支持有关分配有限资源的规划、改造和风险缓解决策，以最大限度地提高桥梁网络的抗震能力。开发的框架和方法可以适用于其他结构系统时，受到不同类型的自然灾害。该研究将为HQP提供跨学科培训，并有机会向多样化的学生团体传授科学和工程在提高基础设施弹性方面的作用。