Rational Evaluation of Shear Capacity in Aging Concrete Structures

老化混凝土结构抗剪承载力的合理评价

• 批准号: 575804-2022
• 负责人: Noel, MartinMB
• 金额: $ 1.82万
• 依托单位: University of Ottawa
• 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=749250
• 关键词: Rational; Evaluation; Shear; Capacity; Aging

This international collaboration aims to apply mechanics-based theories developed at RWTH Aachen University (Germany) to evaluated corroded reinforced concrete (RC) structures being studied at uOttawa (Canada). Until recently, shear design of RC structures was based on empirical data due to lack of understanding of the underlying mechanics. Extensive use of deicing salts in Canada has also resulted in widespread corrosion-induced damage, with 40% of our infrastructure classified as being in very poor, poor, or fair condition Consequently, Canada has become a global leader in understanding and mitigating corrosion, evaluating its implications, and developing practical solutions for structural rehabilitation and strengthening. On the other hand, while corrosion damage greatly increases the degree of uncertainty in shear behaviour, existing Canadian methods lack the fundamental mechanical basis to address this important research challenge. The SCPT recently developed at the Institute of Structural Concrete at RWTH Aachen University is unique in its ability to predict shear crack propagation at all stages of loading and quantify the contribution of each of the various mechanisms resisting the applied shear force. Through this collaboration, we will incorporate the effects of corrosion damage within the SCPT formulation to significantly improve the accuracy and safety of bridge evaluations in Canada and globally. By applying a rational and consistent method to predict the capacity of bridges instead of empiricism, owners will be able to implement appropriate, timely, and cost-effective maintenance and rehabilitation measures.

这项国际合作旨在应用亚琛工业大学（德国）开发的基于力学的理论来评估渥太华大学（加拿大）正在研究的腐蚀钢筋混凝土（RC）结构。直到最近，由于缺乏对基础力学的了解，钢筋混凝土结构的剪切设计仍然基于经验数据。加拿大广泛使用除冰盐也造成了广泛的腐蚀损坏，我们 40% 的基础设施被归类为状况非常差、差或一般。因此，加拿大已成为了解和减轻腐蚀、评估其影响以及开发结构修复和加固实用解决方案的全球领导者。另一方面，虽然腐蚀损伤大大增加了剪切行为的不确定性程度，但加拿大现有的方法缺乏解决这一重要研究挑战的基本机械基础。亚琛工业大学结构混凝土研究所最近开发的 SCPT 具有独特的能力，能够预测加载所有阶段的剪切裂纹扩展，并量化抵抗所施加剪切力的每种机制的贡献。通过这次合作，我们将把腐蚀损坏的影响纳入 SCPT 公式中，以显着提高加拿大和全球桥梁评估的准确性和安全性。通过采用合理且一致的方法而不是经验主义来预测桥梁的承载能力，业主将能够实施适当、及时且具有成本效益的维护和修复措施。