Deflection estimation of reinforced concrete beams using long-gauge optic sensors

Deflection is a crucial indicator in structural health monitoring, directly impacting the service life, safety, and economic viability of structures. However, current indirect methods for measuring deflection, such as multi-element FBG sensors or accelerometers, often have limitations. While they ma...

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Main Authors: Lin, Haoran, Hong, Wan, Yang, Zhihong, Xu, Zhaowen, Wang, Yixin, Li, Bing
Other Authors: School of Civil and Environmental Engineering
Format: Article
Language:English
Published: 2024
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Online Access:https://hdl.handle.net/10356/180721
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1807212024-10-22T01:52:43Z Deflection estimation of reinforced concrete beams using long-gauge optic sensors Lin, Haoran Hong, Wan Yang, Zhihong Xu, Zhaowen Wang, Yixin Li, Bing School of Civil and Environmental Engineering Engineering Deflection distribution estimation Shear deformation Deflection is a crucial indicator in structural health monitoring, directly impacting the service life, safety, and economic viability of structures. However, current indirect methods for measuring deflection, such as multi-element FBG sensors or accelerometers, often have limitations. While they may be suitable for flexure-dominated reinforced concrete (RC) specimens in the elastic stage, they neglect the significant influence of nonlinearity and shear deformation. This paper introduces a new approach for estimating the deflection of reinforced concrete (RC) beams using distributed long-gauge optic sensors. The method tackles the limitations of current methods by incorporating the crucial factors of shear deformation, neutral axis position variation and shear stiffness degradation. Experimental studies are first conducted to validate the accuracy and stability of long-gauge optic sensors in small-scale RC members. Algorithms are then utilized the measurement data to estimate the deflection. The results demonstrate the excellent performance of long-gauge optic sensors in measuring shear deformation and vertical deflection of RC beams, as evidenced by comparisons with LVDT measurements. Additionally, a method for decoupling flexural and shear deformation is proposed. This method offers a preliminary assessment of the reinforced concrete (RC) beam type by quantifying the relative significance of shear deformation. Housing & Development Board Ministry of National Development (MND) National Research Foundation (NRF) This research is supported by the National Research Foundation (NRF), Singapore, Ministry of National Development (MND), Singapore, and Housing & Development Board (HDB), Singapore under its Cities of Tomorrow R&D Programme (CoT Award COT-V2–2020-2). Any opinions, findings and conclusions or recommendations expressed in this material are those of the author(s) and do not reflect the views of National Research Foundation, Singapore and Ministry of National Development, Singapore. 2024-10-22T01:52:43Z 2024-10-22T01:52:43Z 2024 Journal Article Lin, H., Hong, W., Yang, Z., Xu, Z., Wang, Y. & Li, B. (2024). Deflection estimation of reinforced concrete beams using long-gauge optic sensors. Structures, 69, 107249-. https://dx.doi.org/10.1016/j.istruc.2024.107249 2352-0124 https://hdl.handle.net/10356/180721 10.1016/j.istruc.2024.107249 2-s2.0-85203805276 69 107249 en COT-V2–2020-2 Structures © 2024 Institution of Structural Engineers. Published by Elsevier Ltd. All rights are reserved, including those for text and data mining, AI training, and similar technologies.
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering
Deflection distribution estimation
Shear deformation
spellingShingle Engineering
Deflection distribution estimation
Shear deformation
Lin, Haoran
Hong, Wan
Yang, Zhihong
Xu, Zhaowen
Wang, Yixin
Li, Bing
Deflection estimation of reinforced concrete beams using long-gauge optic sensors
description Deflection is a crucial indicator in structural health monitoring, directly impacting the service life, safety, and economic viability of structures. However, current indirect methods for measuring deflection, such as multi-element FBG sensors or accelerometers, often have limitations. While they may be suitable for flexure-dominated reinforced concrete (RC) specimens in the elastic stage, they neglect the significant influence of nonlinearity and shear deformation. This paper introduces a new approach for estimating the deflection of reinforced concrete (RC) beams using distributed long-gauge optic sensors. The method tackles the limitations of current methods by incorporating the crucial factors of shear deformation, neutral axis position variation and shear stiffness degradation. Experimental studies are first conducted to validate the accuracy and stability of long-gauge optic sensors in small-scale RC members. Algorithms are then utilized the measurement data to estimate the deflection. The results demonstrate the excellent performance of long-gauge optic sensors in measuring shear deformation and vertical deflection of RC beams, as evidenced by comparisons with LVDT measurements. Additionally, a method for decoupling flexural and shear deformation is proposed. This method offers a preliminary assessment of the reinforced concrete (RC) beam type by quantifying the relative significance of shear deformation.
author2 School of Civil and Environmental Engineering
author_facet School of Civil and Environmental Engineering
Lin, Haoran
Hong, Wan
Yang, Zhihong
Xu, Zhaowen
Wang, Yixin
Li, Bing
format Article
author Lin, Haoran
Hong, Wan
Yang, Zhihong
Xu, Zhaowen
Wang, Yixin
Li, Bing
author_sort Lin, Haoran
title Deflection estimation of reinforced concrete beams using long-gauge optic sensors
title_short Deflection estimation of reinforced concrete beams using long-gauge optic sensors
title_full Deflection estimation of reinforced concrete beams using long-gauge optic sensors
title_fullStr Deflection estimation of reinforced concrete beams using long-gauge optic sensors
title_full_unstemmed Deflection estimation of reinforced concrete beams using long-gauge optic sensors
title_sort deflection estimation of reinforced concrete beams using long-gauge optic sensors
publishDate 2024
url https://hdl.handle.net/10356/180721
_version_ 1814777721602965504