Structural Health Monitoring of the Scaffolding Dismantling Process of a Long‐Span Steel Box Girder Viaduct Based on BOTDA Technology

Abstract

In this study, a distributed optical fiber sensing technique based on Brillouin optical time-domain analysis (BOTDA) is used to construct a complete bridge health monitoring system by continuously laying distributed sensing fiber lines in a steel box girder. e bridge scaffolding dismantling process is monitored to study the variation of the strain distribution. Additionally, a bridge finite element model is built to simulate the bridge scaffolding removed condition, and the strain distribution of the long-span steel box girder viaduct after scaffolding dismantling is compared with the measured values. is study provides a reference for monitoring the scaffolding dismantling process based on BOTDA technology.

Temporary Structural Health Monitoring of Historical Széchenyi Chain Bridge

“…Strain is one of the most important variables for the safety evaluation, fatigue assessment, and validation of models. Strain can be measured using, e.g., a traditional strain gauge, a vibrating-wire strain gauge, or FBG strain sensors [11][12][13]. Okasha and Frangopol [14] presented a performance-based life-cycle bridge management framework with the integration of SHM, which can be used for the safety evaluation of different types of bridges.…”

Review: distributed time-domain sensors based on Brillouin scattering and FWM enhanced SBS for temperature, strain and acoustic wave detection

“…Compared with BOTDR, BOTDA uses the stimulated Brillouin scattering (SBS) to get a strong signal and better spatial resolution by sending both pulsed probe light and continuous pump light in the fiber with an enhanced scattering process. The performance of BOTDA has been improved significantly over the years which lead to applications in the structural health monitoring in the industry [ 8 – 10 ]. Since the first demonstration of the distributed temperature sensor based on Brillouin scattering [ 11 ] with 3 °C temperature resolution, 100 m spatial resolution over 1 km sensing length, many researchers around the world have contributed to this field to demonstrate long sensing length (over 100 km), higher spatial resolution (cm) and high temperature resolution (<1 ° C ) and strain resolution [ 12 ].…”

Damage localization and quantification in the Catwalk of Foroozan offshore complex using improved modal strain energy method

“…Li and Hao, (2016) reviewed recent developments in the field of structural health monitoring, including signal processing methods for operational modal analysis, a user friendly graphical modal analysis toolkit, non-modal methods for evaluating shear joints in composite bridges and determining the free span and support conditions of pipelines, vibration based damage detection methods and model updating including the effects of uncertainty and noise as well as identifying structures under moving loads [26]. Ding, et al, (2019) practically monitored the condition of the scaffold separation process from a large steel span bridge during the bridge construction process and examined changes in strain distribution. They also modeled the bridge to simulate scaffold removal conditions using the finite element method and compared the strain distribution in the girder with the measured values [27].…”

“…Ding, et al, (2019) practically monitored the condition of the scaffold separation process from a large steel span bridge during the bridge construction process and examined changes in strain distribution. They also modeled the bridge to simulate scaffold removal conditions using the finite element method and compared the strain distribution in the girder with the measured values [27]. This comprehensive literature study shows the high accuracy and ability of the modal strain energy method for damage detection in marine structures.…”