Advancing the Seismic Design Practices of Concrete Bridge Piers Reinforced with High Strength Steel Rebars

推进高强钢筋混凝土桥墩抗震设计实践

• 批准号: 566761-2021
• 负责人: Alam, ShahriaS
• 金额: $ 3.21万
• 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=761704
• 关键词: Advancing; Seismic; Design; Practices; Concrete

There is an increased demand for high-strength steel (HSS) reinforcing bars in concrete construction in Canada and worldwide. This demand is fueled by the need to build larger and more complex structures to address population and societal demands. Congestion in construction is another motivation for seeking HSS. Introducing HSS in concrete construction has the potential to reduce the overall volume of steel, which could translate to reductions in energy consumption related to manufacturing, fabrication, and shipping along with cost reduction. However, we are unable to make use of the full potential of HSS rebars due to the restrictions imposed by Canadian design codes on the use of HSS rebars in both non-seismic and seismic applications. This research aims to alleviate design code committees' concerns regarding the use of HSS in seismic applications by executing a comprehensive research program where the performance of HSS in bridge columns is assessed and documented. To achieve the research objective, a combination of experimental and numerical techniques will be employed. The first stage will involve evaluating the mechanical properties of HSS rebars available in the Canadian market. At the material level, a large emphasis will be placed on the low-cycle fatigue performance of HSS and the development of appropriate fatigue life predictive models. At the member level, a series of large-scale quasi-static cyclic tests will be performed on concrete bridge columns reinforced with HSS. The generated experimental data will be employed to validate a fiber element-based numerical model. The numerical model will be used to predict strain- and drift-based limit states for concrete bridge columns reinforced with HSS where the columns will have a wide range of geometrical and material properties. The data generated from the numerical expressions will be used to develop design expressions facilitating the performance-based design of bridge columns reinforced with HSS. The research team will work closely with the design code committee to formulate the appropriate framework with which the proposed design recommendations can be incorporated in the design codes.

加拿大和全球混凝土建筑对高强度钢 (HSS) 钢筋的需求不断增加。这种需求是由于需要建造更大、更复杂的结构来满足人口和社会需求而推动的。施工拥堵是寻求高速钢的另一个动机。在混凝土建筑中引入高速钢有可能减少钢材的总用量，从而减少与制造、制造和运输相关的能源消耗，并降低成本。然而，由于加拿大设计规范对在非地震和地震应用中使用高速钢钢筋的限制，我们无法充分利用高速钢钢筋的潜力。本研究旨在通过执行一项综合研究计划，评估和记录桥柱中 HSS 的性能，从而减轻设计规范委员会对在地震应用中使用 HSS 的担忧。为了实现研究目标，将采用实验和数值技术的结合。第一阶段将涉及评估加拿大市场上可用的高速钢螺纹钢的机械性能。在材料层面，重点将放在高速钢的低周疲劳性能和适当的疲劳寿命预测模型的开发上。在构件层面，将对高速钢加固的混凝土桥柱进行一系列大型准静态循环试验。生成的实验数据将用于验证基于纤维单元的数值模型。该数值模型将用于预测高速钢加固混凝土桥柱基于应变和漂移的极限状态，其中桥柱将具有广泛的几何和材料特性。数值表达式生成的数据将用于开发设计表达式，促进高速钢加固桥柱的基于性能的设计。研究团队将与设计规范委员会密切合作，制定适当的框架，将拟议的设计建议纳入设计规范中。