Fostering Structural Health Monitoring of Existing Infrastructures by Coupling Damage Cluster Analysis and Scanning Laser Doppler Vibrometry

考虑到加拿大和魁北克的基础设施的年龄，我们老化的基础设施的维护成本是一个令人担忧的情况。令人遗憾的是，桥梁维修计划受到后期维修的影响，这些维修费用高昂，而且往往无效。主要的挑战是在尽可能早的阶段发现损坏，以最大限度地延长寿命，并避免后期昂贵的赔偿。目前NSERC RTI拨款申请旨在开发一种开创性的桥梁诊断工具，该工具结合了先进的统计损伤检测方法和尖端的传感器技术。所需的扫描激光多普勒测振仪（SLDV）仪器对于实现以下目标至关重要：1\开发基于现有结构曲率变化的尖端和高精度损伤检测方法，此处称为SLDV- hsm。这将通过减少损伤的错误指示和更好地估计最佳康复时间来促进SHM技术。应用SLDV-SHM技术不仅对现有桥梁进行预防，而且对修复后的性能进行跟踪。例如，我们将应用开发的SLDV-SHM技术来跟踪采用R-UHPFRC覆盖（REF）等现代加固技术加固的桥梁的结构行为，以最大限度地提高寿命增益。通过与魁北克省结构部门和魁北克省交通部合作开展试点项目，加强目前加拿大SHM技术的实践。

Considering the age of the infrastructure in Canada and Quebec, the maintenance cost of our aging infrastructure is an impelling situation. Regrettably, bridge maintenance plans are affected by late reparations which are costly and often ineffective. The main challenge is to detect damage at the earliest possible stage to maximize the life extension and to avoid late costly reparations. The present NSERC RTI grant application aims at developing a groundbreaking bridge-diagnostic tool that couples advanced statistical damage detection methods and a cutting-edge sensor technology. The required Scanning Laser Doppler Vibrometer (SLDV) instrument is today essential for achieving the following objectives: 1\ Develop a cutting-edge and highly accurate damage detection methods based on curvature changes of existing structures, herein called SLDV-HSM. This will foster SHM technique by reducing the false indication of damage and better estimating the optimal time of rehabilitation. 2\ Apply the SLDV-SHM technique not only for prevention of existing bridges, but also for following up the post-reparation performances. For instance, we will apply the developed SLDV-SHM technique for following up the structural behavior of bridges strengthened by modern strengthening techniques such as R-UHPFRC overlays (REF) to maximize the lifetime gain. 3\ Train HPQ and engineers on groundbreaking SHM techniques in the maintenance of the aging infrastructure of Quebec and Canada. 4\ Enhance current practices of SHM technique in Canada by undertaking pilot projects with the structural division of the City of Quebec and the Ministry of Transport of Quebec.