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明确指出，加拿大桥梁的快速老化令人震惊。截至 2019 年，加拿大桥梁状况“差”或“非常差”的比例自 2016 年以来增加了两倍，达到 12% 左右。修复或更换这些老化的桥梁将因车道和/或道路封闭而导致严重的交通中断。因此，通过加速桥梁施工 (ABC) 采用预制混凝土桥梁构件和系统 (PBES) 的需求比以往任何时候都更大，这可以大大节省施工时间。然而，由于缺乏抗震设计指南，PBES的部署仅限于低震地区。 PBES 耐久性很大程度上受环境暴露的影响，但对 PBES 耐久性的认识差距也减慢了 PBES 的采用。气候变化预计会加速恶化速度，给 PBES 的耐久性带来额外的不确定性。为了应对上述挑战，拟议的研究计划旨在增强暴露于偶发性（地震）和慢性（气候变化背景下的腐蚀）危害的 PBES 的恢复能力。为了实现这一目标，该研究将利用材料科学的进步，利用具有卓越机械和耐久性能的超高性能混凝土（UHPC）。未来五年，该研究将做出以下独特贡献：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来开发抗震PBES。 2）描述气候变化下PBES与腐蚀相关的劣化特征，并研究UHPC以增强PBES的耐腐蚀性。 3) 创建一个分析框架来评估气候变化对 PBES 生命周期地震脆弱性的影响。该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“腐蚀”危险图以及开发基于 UHPC 的解决方案，推进 PBES 的最先进的地震和气候恢复能力。地震损害控制和气候变化适应。开发的定量地震损伤状态将有助于加拿大公路桥梁设计规范适应基于性能的 PBES 抗震设计。通过考虑未来的气候条件，寿命预测方法将改进 PBES 的使用寿命设计，以实现持续的适用性和地震安全性。桥梁设计者和业主将受益于 PBES 的抗震设计和决策导向的长期性能评估研究。这对于释放 ABC 在同样受到气候变化影响的加拿大地震区桥梁修复和建设方面的潜力是非常必要的。 HQP 将接受先进桥梁设计和施工技术的培训，并成为为加拿大人民建设和维护安全、可持续的桥梁基础设施的重要贡献者。