Development of innovative methods for structural health monitoring and related improvement of structural performance and resilience

我国基础设施的很大一部分是在70年代中期建造的，迫切需要修复和/或重建。为了减少结构对操作和极端载荷的脆弱性（例如，地震），通过定期检查和结构健康监测（SHM）技术确定其结构状况和能力是很重要的。这对于做出有效的结构修复决策至关重要，并利用高性能材料（例如，高强度混凝土、纤维增强聚合物或FRP），以及新的装置和系统（例如，阻尼器和控制系统），以提高结构性能和弹性。 拟议研究的长期目标是开发有效的方法来实现可持续和有弹性的基础设施。短期目标是：（1）开发用于结构原位性能评估的创新SHM技术，以及（2）开发实用方法，以使用基于SHM的状态评估来改善结构性能和对操作和极端事件（例如地震）的恢复力。 为了实现目标1，拟议的研究计划将侧重于开发新的传感方法，用于监测，系统识别和结构损伤检测技术。将特别注意SHM的无线传感器，并在实验室和现场研究其性能。许多问题包括传感器的最佳放置、适当的部署机制、检测传感器故障、环境对监测数据的影响、检测新事件（例如，地震），识别系统属性，并检测结构损伤将在这项研究中解决。 为了实现目标2，目前的研究将集中在新材料和新技术上，如先进的复合材料和阻尼装置，以提高结构的性能。将特别关注基于磁流变（MR）流体的半主动阻尼器在控制结构振动响应。这些设备的有效应用需要简化的方法来模拟它们在一个结构系统，这将在这里解决的开发一个简化的建模技术，这样的设备，并将它们集成到结构模型，以分析其性能。半有源器件的功能可以直接与结构的SHM系统联系在一起，因为这样的器件需要结构在其动态响应方面的反馈。 拟议的研究计划将建立在申请人在上述领域正在进行的工作。在拟议的研究中有很大的创新潜力，旨在提高上述领域的基础知识。研究成果预计将提高民用和建筑基础设施的安全性，并造福加拿大社会。

A large part of our infrastructure was built in mid-seventies and they are in urgent need of rehabilitation and/or reconstruction. In order to reduce the vulnerability of structures to operational and extreme loadings (e.g., earthquake), it is important to determine their structural conditions and capacity through regular inspection and Structural Health Monitoring (SHM) techniques. This is essential for making effective decisions on structural rehabilitation, and take advantage of high performing materials (e.g., high strength concrete, fiber reinforced polymer or FRP), and new devices and systems (e.g., dampers and control systems) to improve the structural performance and resilience. The long term goal of the proposed research is to develop effective methods to achieve sustainable and resilient infrastructure. The short term goals are to: (1) develop innovative SHM techniques for evaluation of the in-situ performance of structures, and (2) develop practical methods to improve structural performance and resilience to operational and extreme events (e.g. earthquake) using the SHM-based condition assessment. To achieve Goal 1, the proposed research program will focus on the development of new sensing methods for monitoring, system identification and damage detection techniques in structures. Particular attention will be given to wireless sensors for SHM and their performance will be studied in the laboratory and field. A number of issues including optimal placement of sensors, appropriate deployment mechanism, detecting sensor malfunction, environmental effect on monitoring data, detecting novel events (e.g., earthquake), identify system properties, and detect structural damage will be addressed in this research. To achieve Goal 2, the present research will focus on new materials and technologies such as advanced composites and damping devices to upgrade the performance of a structure. Particular attention will be given to magneto-rheological (MR) fluid-based semi-active dampers in controlling vibration response in structures. Effective application of these devices requires simplified methods to model them in a structural system, which will be addressed here by developing a simplified modelling technique for such devices and integrating them to structural models to analyze their performance. The functioning of a semi-active device can be directly tied to the SHM system of a structure as such a device requires feedback from structure in terms of its dynamic response. The proposed research program will be built upon the applicant's ongoing work in the above areas. There is significant potential for innovation in the proposed research which aims at enhancing the fundamental knowledge in the above areas. The outcome of the research is expected to enhance the safety of the civil and built infrastructure and benefit the Canadian society.