Structural Health Monitoring of Reinforced Concrete Structures with Advanced Concrete Mixtures

采用先进混凝土混合物的钢筋混凝土结构的结构健康监测

• 批准号: RGPIN-2018-03790
• 负责人: Hassan, Assem
• 金额: $ 2.26万
• 依托单位: Memorial University of Newfoundland
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2019
• 资助国家: 加拿大
• 起止时间: 2019-01-01 至 2020-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=684084
• 关键词: Structural; Health; Monitoring; Reinforced; Concrete

Structural performance and health assessment of reinforced concrete structures is an essential requirement throughout the designed service lifetime of the structures, especially when they are constructed with relatively new concrete mixtures. Acoustic emission (AE) monitoring is a well-established technique that has been successfully employed in the non-destructive assessment of concrete structures. This method has shown its effectiveness in early damage prognosis/diagnosis in concrete materials/structures exposed to various damage mechanisms. However, the feasibility of using AE methodology in continuous structural health monitoring (SHM) systems needs better understanding and further development. This is particularly important when monitoring structures with variable concrete materials that can lead to different wave propagation characteristics and consequently affect the AE data. The sensitivity of AE monitoring to the changes in loading conditions and temperature/humidity variations also requires further investigation. ***There is very limited information available in the literature regarding AE monitoring in concrete structures subjected to different loading and weathering conditions, especially when advanced concrete mixtures are investigated. The proposed research program aims to utilize an SHM system based on AE techniques to evaluate the short- and long-term performance of reinforced concrete structures constructed with modern developed concrete mixtures under a variety of loading conditions. The developed concrete mixtures in this research program will include fibre-reinforced lightweight self-consolidating concrete (FRLWSCC), self-consolidating rubberized concrete (SCRC), and fibre-reinforced self-consolidating rubberized concrete (FRSCRC). The impact of different concrete types, mixture proportions, loading types, sensor locations, and specimen sizes on the collected AE data from continuous SHM of reinforced concrete elements will be examined and quantified in this research. The influence of varying temperature/humidity on the performance of the produced mixtures and the corresponding AE signals will also be examined. The research will address important gaps in the development of advanced concrete mixtures and will contribute to the improvement of AE monitoring. The research will also provide a unique environment for training of HQP in fundamental and applied research. The results of this research will contribute to the body of knowledge of both AE monitoring and advanced concrete technology. The outcomes of this project will increase the technology development and design capability in Canada by extending the facility operating lifetime and improving the safe and design efficiency of concrete structures.

钢筋混凝土结构的结构性能和健康评估是贯穿结构设计使用寿命的基本要求，特别是当它们是用相对较新的混凝土混合物建造时。声发射（AE）监测是一种成熟的技术，已成功地用于混凝土结构的无损评估。该方法已被证明是有效的早期损伤预测/诊断在混凝土材料/结构暴露于各种损伤机制。然而，在连续结构健康监测（SHM）系统中使用AE方法的可行性需要更好的理解和进一步的发展。当监测具有可变混凝土材料的结构时，这一点尤其重要，可变混凝土材料可能导致不同的波传播特性，从而影响AE数据。声发射监测对荷载条件和温度/湿度变化的敏感性也需要进一步研究。* 在文献中，关于在不同荷载和风化条件下混凝土结构中进行AE监测的信息非常有限，特别是在研究高级混凝土混合物时。拟议的研究计划的目的是利用基于AE技术的SHM系统，以评估在各种荷载条件下与现代开发的混凝土混合物建造的钢筋混凝土结构的短期和长期性能。在这项研究计划中开发的混凝土混合物将包括纤维增强轻质自固结混凝土（FRLWSCC），自固结橡胶混凝土（SCRC），纤维增强自固结橡胶混凝土（FRSCRC）。不同的混凝土类型，混合比例，加载类型，传感器的位置，和试样尺寸上收集的AE数据从连续SHM钢筋混凝土元件的影响将在本研究中进行检查和量化。还将检查温度/湿度变化对所产生的混合物的性能和相应的AE信号的影响。该研究将解决先进混凝土混合物开发中的重要差距，并将有助于改善AE监测。该研究还将为基础和应用研究方面的HQP培训提供独特的环境。这项研究的结果将有助于AE监测和先进的混凝土技术的知识体系。该项目的成果将通过延长设施运行寿命和提高混凝土结构的安全性和设计效率，提高加拿大的技术开发和设计能力。