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, Shahria
• 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: 2021
• 资助国家: 加拿大
• 起止时间: 2021-01-01 至 2022-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=723035
• 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.

在加拿大和全球的混凝土结构中，对高强度钢（HSS）加固杆的需求增加。需要建立更大，更复杂的结构来满足人口和社会需求的需求，这是为了推动这一需求。建筑中的拥塞是寻求HSS的另一个动机。在混凝土结构中引入HSS有可能减少钢的整体量，这可能转化为减少与制造，制造和运输相关的能源消耗以及降低成本。但是，由于加拿大设计代码对在非主体和地震应用中使用HSS钢筋的限制，我们无法利用HSS钢筋的全部潜力。这项研究旨在通过执行一项全面的研究计划来减轻设计法规委员会对HSS在地震应用中使用的担忧，在该计划中评估和记录了HSS在桥柱中的性能。为了实现研究目标，将采用实验技术和数值技术的组合。第一阶段将涉及评估加拿大市场中HSS钢筋的机械性能。在材料层面上，将很大的重点放在HSS的低循环疲劳性能以及适当的疲劳寿命预测模型的发展上。在成员一级，将在用HSS加强的混凝土桥柱上进行一系列大规模的准静态循环测试。生成的实验数据将用于验证基于光纤元素的数值模型。数值模型将用于预测基于应变和漂移的极限状态，用于用HSS加固的混凝土桥柱，该柱将具有广泛的几何和材料特性。从数值表达式产生的数据将用于开发设计表达式，以促进基于HSS加强的基于性能的桥梁设计。研究团队将与设计法规委员会紧密合作，以制定适当的框架，可以将建议的设计建议纳入设计代码。