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Statistical Vibration-based Damage Localization on Saint-Nazaire Bridge Mock-up

机译：基于统计振动的圣纳泽尔桥梁模型的损伤定位

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摘要

The characterization of damages from output-only vibration measurements is an important issue for Structural Health Monitoring (SHM), in particular for bridges under ambient excitation. In the last years, a multitude of methods has been proposed for vibration-based damage detection, localization and quantification. In this work, a benchmark application for such methods is proposed, namely a 1/200 scale model of the Saint-Nazaire Bridge, which is a cable-stayed bridge spanning the Loire River near the river's mouth. The region of interest, the central metallic structure, measures 720 meters. The aim of the instrumentation is to assess the capability of damage assessment methods to assess a cable failure. The model is instrumented with ten accelerometers and excited by white noise. A damage localization method is applied to test the proposed setup, namely the statistical damage locating vector approach (S-SDDLV). With this method, vibration measurements from the (healthy) reference and damaged states of the structure are confronted to a finite element of the reference state. Damage indicators are provided for the different structural elements that are easy to compute, without updating the model parameters, and taking into account the intrinsic uncertainty of noisy measurements.
机译：仅输出振动测量的损伤表征对于结构健康监测（SHM）尤其是环境激励下的桥梁而言是一个重要的问题。在过去的几年中，已经提出了许多用于基于振动的损伤检测，定位和量化的方法。在这项工作中，提出了此类方法的基准应用程序，即Saint-Nazaire桥梁的1/200比例模型，该模型是横跨卢瓦尔河河口附近的斜拉桥。感兴趣的区域，中央金属结构，长720米。仪器的目的是评估损坏评估方法评估电缆故障的能力。该模型装有十个加速度计，并被白噪声激发。损伤定位方法被用于测试所提出的装置，即统计损伤定位矢量方法（S-SDDLV）。通过这种方法，来自（健康）参考状态和结构损坏状态的振动测量将面对参考状态的有限元素。为易于计算的不同结构元素提供了损坏指标，而无需更新模型参数，并考虑了噪声测量的内在不确定性。

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