Next Generation Earthquake-resilient Precast Concrete Bridges in a Changing Climate

气候变化中的下一代抗震预制混凝土桥梁

• 批准号: RGPIN-2021-04211
• 负责人: Yang, Cancan
• 金额: $ 1.89万
• 依托单位: McMaster University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 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=749447
• 关键词: Next; Generation; Earthquake; resilient; Precast

The 2019 Canada Infrastructure Report Card makes it clear that the rapid aging of Canada's bridges is alarming. As of 2019, the percentage of Canadian bridges that are in `poor' or `very poor' condition has tripled since 2016 to around 12%. Repairing or replacing these deteriorating bridges will cause significant traffic disruptions due to lane and/or road closures. As such, the need for adoption of Prefabricated Concrete Bridge Elements and Systems (PBES) through Accelerated Bridge Construction (ABC), which can offer tremendous savings in construction time, is greater than ever. However, the deployment of PBES has been limited to low-seismicity areas due to the lack of seismic design guidelines. Knowledge gaps on PBES durability, which is largely influenced by environmental exposure, also slow down the adoption of PBES. Climate change is expected to accelerate the deterioration rate, creating additional uncertainty in the durability of PBES. To tackle the above challenges, the proposed research program aims to enhance the resilience of PBES that are exposed to both episodic (earthquake) and chronic (corrosion in the context of climate change) hazards. To fulfill this goal, the research will take advantage of advances in materials science by utilizing Ultra-high-Performance Concrete (UHPC) with exceptional mechanical and durability properties. Over the next five years, the research will make the following unique contributions: 1) Develop seismically resilient PBES by using UHPC-based low-damage connection technologies and by proposing quantitative seismic damage states. 2) Characterize corrosion-related deterioration for PBES under a changing climate, and investigate UHPC to enhance the corrosion resistance of PBES. 3) Create an analytical framework to assess the climate change impact on the lifetime seismic vulnerability of PBES. The research will advance the state-of-the-art of seismic and climate resilience of PBES by generating high-quality test data, developing validated computational methods and design tools, creating Canadian `corrosion' hazard map, and developing UHPC-based solutions for seismic damage control and climate change adaption. The developed quantitative seismic damage states will assist Canadian Highway Bridge Design Code in adapting performance-based seismic design for PBES. By incorporating future climate conditions, the lifetime prediction methods will improve the service life design of PBES for sustained serviceability and seismic safety. Bridge designers and owners will benefit from the research for seismic design and decision-oriented long-term performance evaluation for PBES. This is much needed to unlock the potential of ABC for bridge repair and construction in seismic areas of Canada that are also affected by climate change. HQP will be trained in advanced bridge design and construction techniques, and become important contributors to build and maintain safe and sustainable bridge infrastructure for Canadians.

2019年加拿大基础设施报告卡清楚地表明，加拿大桥梁的快速老化令人震惊。截至2019年，自2016年以来，处于“差”或“非常差”状况的加拿大桥梁的比例已增加了两倍，达到了12％左右。修复或替换这些恶化的桥梁将由于车道和/或闭路而导致大幅交通中断。因此，通过加速桥梁建设（ABC）采用预制混凝土桥梁元件和系统（PBE）的需求比以往任何时候都更大。但是，由于缺乏地震设计指南，PBE的部署仅限于低频领域。 PBE耐用性的知识差距在很大程度上受环境暴露的影响也减慢了PBE的采用。预计气候变化将加速劣化率，从而在PBE的耐用性中造成额外的不确定性。为了应对上述挑战，拟议的研究计划旨在增强暴露于情节性（地震）和慢性（在气候变化中腐蚀）危害的PBE的弹性。为了实现这一目标，该研究将利用具有出色的机械和耐用性能的超高绩效混凝土（UHPC）来利用材料科学的进步。在接下来的五年中，这项研究将做出以下独特的贡献：1）通过使用基于UHPC的低损伤连接技术并提出定量地震损伤状态，从而发展具有地震弹性的PBE。 2）表征在气候变化下PBE的腐蚀相关的恶化，并研究UHPC以增强PBE的耐腐蚀性。 3）创建一个分析框架，以评估气候变化对PBE的寿命地震脆弱性的影响。这项研究将通过生成高质量的测试数据，开发经过验证的计算方法和设计工具，创建加拿大的“腐蚀”危险图，并开发基于UHPC的解决方案，以实现地震损害控制和气候变化适应，从而推动PBE的地震和气候弹性的最新弹性。开发的定量地震损伤状态将有助于加拿大高速公路桥设计代码，以适应PBES基于性能的地震设计。通过纳入未来的气候条件，终生预测方法将改善PBE的使用寿命设计，以持续使用可服务性和地震安全。桥梁设计师和所有者将受益于对PBE的地震设计和面向决策的长期绩效评估的研究。在加拿大地震地区，ABC的桥梁维修和建设的潜力也很需要，这也受到气候变化的影响。 HQP将接受高级桥梁设计和建筑技术的培训，并成为为加拿大人建造和维护安全可持续的桥梁基础设施的重要贡献者。