Modal-Based Detection of Bolt Loosening in Steel Structures: EMA vs. OMA Comparison

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کد مقاله : 1089-ISAV2023 (R2)
نویسندگان
1Center of Advanced Systems and Technologies (CAST), School of Mechanical Engineering, University of Tehran
2استاد دانشکده فنی دانشگاه تهران
چکیده
The loosening of bolted connections within structural elements poses a significant threat to their load-bearing capacity. Early detection of such loosening is paramount to prevent structural failures. However, traditional non-destructive testing methods often struggle to identify bolted connection issues due to the intricate geometry and material disparities present within these connections. In response to this challenge, a vibration-based approach emerges as a promising solution, utilizing changes in the natural frequencies of structures to pinpoint the extent of damage, particularly in bolted connections. This article presents experimental investigations to detect loosening within bolted connections in a lab-scale steel beam using both Experimental Modal Analysis (EMA) and Operational Modal Analysis (OMA). The results demonstrate the successful detection of the extent of loosened bolted connections during experimental damage assessments. The findings presented herein underscore the efficacy of a vibration-based approach in detecting bolt loosening, contributing to advancing structural health monitoring and mitigating potential catastrophic failures.
کلیدواژه ها
موضوعات
 
Title
Modal-Based Detection of Bolt Loosening in Steel Structures: EMA vs. OMA Comparison
Authors
Abstract
The loosening of bolted connections within structural elements poses a significant threat to their load-bearing capacity. Early detection of such loosening is paramount to prevent structural failures. However, traditional non-destructive testing methods often struggle to identify bolted connection issues due to the intricate geometry and material disparities present within these connections. In response to this challenge, a vibration-based approach emerges as a promising solution, utilizing changes in the natural frequencies of structures to pinpoint the extent of damage, particularly in bolted connections. This article presents experimental investigations to detect loosening within bolted connections in a lab-scale steel beam using both Experimental Modal Analysis (EMA) and Operational Modal Analysis (OMA). The results demonstrate the successful detection of the extent of loosened bolted connections during experimental damage assessments. The findings presented herein underscore the efficacy of a vibration-based approach in detecting bolt loosening, contributing to advancing structural health monitoring and mitigating potential catastrophic failures.
Keywords
Modal Analysis, natural frequencies, Structural health monitoring, bolt loosening
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