Innovative Hybrid Structural Systems and Smart Monitoring for Sustainable Bridge Infrastructure

可持续桥梁基础设施的创新混合结构系统和智能监控

• 批准号: RGPIN-2019-07181
• 负责人: ElBadry, Mamdouh
• 金额: $ 2.26万
• 依托单位: University of Calgary
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2020
• 资助国家: 加拿大
• 起止时间: 2020-01-01 至 2021-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=716404
• 关键词: Innovative; Hybrid; Structural; Systems; Smart

The proposed research aims at developing innovative design and smart structural health monitoring for sustainable performance of bridge infrastructure. Focus is placed on two themes: Theme 1 - Development of Sustainable Hybrid Bridge Systems: Innovative corrosion-free hybrid systems are currently under development by the applicant. The main objective of this research is to develop an optimum design of a sustainable and more durable and cost-effective system for short- and medium-span bridges. The proposed system can apply to hundreds of bridges constructed every year. In the new system, the superstructure is built entirely from materials that are immune to corrosion. Advantages of the system include reduced self-weight and enhanced durability. The light weight reduces the required amount of prestressing and the load on the supports, resulting in a smaller size of the substructure, or allows for longer spans, which may lead to a smaller number of supporting piers in multi-span bridges and, hence, reduction in the initial cost. The enhanced durability reduces the maintenance cost and can lead to a bridge lifespan that is double or even triple that of the average traditionally constructed bridges. The long-term objective is to develop guidelines and procedures for the design, fabrication and construction of the new bridge system. Theme 2 - Development of Damage Identification Technique for Structural Health Monitoring: A vibration-based damage identification technique (DIT) is currently under development. It can detect structural damage, determine its location, and estimate its severity in in-service bridges. The DIT combines discrete wavelet transforms and spectral entropy in a relative procedure to detect and quantify damage-induced disturbances in bridge dynamic responses measured under ambient vibration. This relative wavelet entropy (RWE) based DIT is a practical means for damage identification in in-situ cases, where the bridge normal operation cannot be interrupted to perform dynamic excitation tests and when data from a reference (undamaged) state of the bridge are not available for comparison with data obtained from current (damaged) state. Preliminary results of implementing the RWE DIT in a variety of bridge components tested under static and fatigue loading have proved efficacy of the technique in identifying test-induced damage under varying operational and environmental conditions. The objective of this theme is to further develop the DIT to be able to characterize various types of damage and quantify their actual (not estimated) severity. This can be done by combining a finite element (FE) model updating procedure with the developed RWE-based technique. For this purpose, RWE indices obtained from bridge component tests will be compared with the ones obtained from the FE models. Different optimization tools will be investigated in this study to enhance accuracy of the FE models.

拟议的研究旨在开发创新设计和智能结构健康监测，以实现桥梁基础设施的可持续性能。重点放在两个主题上： 主题1 -可持续混合桥梁系统的开发：申请人目前正在开发创新的无腐蚀混合系统。本研究的主要目标是为中、短跨度桥梁开发一种可持续的、更耐用的、具有成本效益的系统的优化设计。该系统可以应用于每年建造的数百座桥梁。在新系统中，上层建筑完全由抗腐蚀材料制成。该系统的优点包括减轻自重和增强耐用性。重量轻减少了所需的预应力量和支架上的载荷，从而减小了下部结构的尺寸，或允许更长的跨度，这可能导致多跨桥梁中的支撑墩数量减少，从而降低了初始成本。增强的耐久性降低了维护成本，并可使桥梁的使用寿命是传统桥梁的两倍甚至三倍。长期目标是为新桥梁系统的设计、制造和施工制定指导方针和程序。 主题2 -结构健康监测损伤识别技术的发展：目前正在开发一种基于振动的损伤识别技术（DIT）。它可以检测结构损伤，确定其位置，并估计其严重性在服务桥梁。DIT结合离散小波变换和谱熵在一个相对的程序来检测和量化环境振动下测量的桥梁动态响应中的损伤引起的干扰。这种基于相对小波熵（RWE）的DIT是一种实用的方法，用于现场情况下的损伤识别，其中桥梁的正常运行不能被中断以进行动态激励测试，并且当桥梁的参考（未损坏）状态的数据无法与当前（损坏）状态的数据进行比较时。在静态和疲劳载荷下测试的各种桥梁部件中实施RWE DIT的初步结果证明了该技术在不同操作和环境条件下识别测试引起的损伤的有效性。本主题的目的是进一步发展分布式信息技术，以便能够描述各种类型的损害并量化其实际（未估计）严重程度。这可以通过结合有限元（FE）模型更新程序与开发的RWE为基础的技术。为此，将从桥梁构件试验中获得的RWE指标与从有限元模型中获得的RWE指标进行比较。不同的优化工具将在这项研究中进行调查，以提高精度的有限元模型。