Detection of buckling in steel pipeline and column by the distributed Brillouin sensor

Ravet, Fabien; Zou, Lufan; Bao, Xiaoyi; Chen, Liang; Huang, Rong; Khoo, Heng-Aik A.

doi:10.1016/j.yofte.2005.12.002

Cited by 37 publications

(12 citation statements)

References 15 publications

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“…If, on the contrary, all the reference fibers are longer than the measuring ones, we must exchange ε in the same equations. In any case, following the same logical path, we eventually reach equations identical to (24) and (25). …”

Section: Limits Of the Technologymentioning

confidence: 99%

“…For example, assuming S ε = 1.15 and n CD = 2, Eq. (25) tells us that if we want to interrogate a 10 m long sensor and the expected strain range is a uniform ε = 1%, then the mirror stroke should be at least 58 mm, regardless of the actual number of fields. All these results have been derived assuming all measuring paths to be longer than the references, and positive thermal expansion coefficients.…”

Section: Limits Of the Technologymentioning

confidence: 99%

“…Compared to other FOS technologies, the main drawback of Brillouin sensors is their limited strain accuracy, which is of the order of 30 µε for BOTDR [24] and 10 µε for BOTDA [23] with current interrogation technologies. These features still make BOTDR/BOTDA systems suitable for inexpensive distributed monitoring of large scale structures, at least in those cases where strain accuracy and exact damage location are not critical issues: the scientific literature reports successful applications to piles, pipes, tunnels, levees, dams, steel structures, and steel cables [24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

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Development and laboratory validation of in-line multiplexed low-coherence interferometric sensors

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Zonta

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Section: Limits Of the Technologymentioning

confidence: 99%

Section: Limits Of the Technologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Development and laboratory validation of in-line multiplexed low-coherence interferometric sensors

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et al. 2008

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“…In addition, fiber optic sensors have been used in various civil engineering applications including the monitoring of bridges, dams and tunnels [25,26]. In geotechnical engineering FOSs are used to measure moisture content and chemical concentration in soils [27,28] and strains along pipelines [29].…”

Section: Fiber Optic Sensorsmentioning

confidence: 99%

Patents and Techniques of Contact Pressure Measurement in Geotechnical Engineering

Meguid¹

2009

ENG

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Measuring the contact pressure between a structure and the surrounding ground is essential for the analysis and design of different geotechnical engineering systems (e.g. foundations, underground tunnels, buried pipes, vertical shafts and retaining walls). Several devices and techniques have been recently developed to facilitate the measurement and monitoring of contact soil pressure. These devices range from stiff pressure cells that measure the soil pressure against a structure at specific locations to flexible tactile sensors that can track the pressure changes continuously over a large contact area. This paper presents a review of selected devices and techniques commonly used to measure contact pressure in different soil-structure interaction problems. Selected US and international patents of relevance to contact pressure measurement in geotechnical engineering are referenced. A comparison between the different measurement techniques with respect to their applicability and limitations is also presented.

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“…However, since modal parameters are used here, this approach may be only applicable to cases where the linearity is still valid, which is unfortunately not true for most cases where buckling occurs. Ravet et al [8] used a distributed Brillouin sensor system to monitor buckling of a steel pipe and column. To initiate buckling, locally thinning the inner wall was applied to two specimens (steel pipe and column).…”

Section: Introductionmentioning

confidence: 99%

Detection of member overall buckling in civil space grid structures based on deviation in normal strain along the member

Yan

Chen

Feng

et al. 2017

Engineering Structures

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A number of structural collapses are initiated from losing stability locally. The monitoring and detection of instability is rarely studied in both research communities of structural health monitoring and structural stability. In order to capture member buckling at an early stage to prevent a local instability from propagating into an overall structural failure, in this study, an approach to detect one type of instability (member overall buckling) is proposed for civil large-scale space grid structures. The foundation of this approach lies in: once a member buckles, a large bending stress due to buckling is developed and dominates the total normal stress of the member. Since the bending stress varies along a member, the total normal stress varies along the member, so does the total normal strain on the surface of the member. Therefore, by identifying the deviation in normal strain at two different cross sections of a member, overall buckling of the member can be detected. This study will justify that strain gauges can pick up all the bending stress induced by buckling as long as they are deployed before buckling. Numerical simulations have been conducted on large-scale space grid structures with different types of connections between members and loading situations. The obtained results have shown that once a member buckles, the strains measured at two different cross sections on the member deviate from each other significantly, verifying the efficacy of the proposed approach.

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Detection of buckling in steel pipeline and column by the distributed Brillouin sensor

Cited by 37 publications

References 15 publications

Development and laboratory validation of in-line multiplexed low-coherence interferometric sensors

Development and laboratory validation of in-line multiplexed low-coherence interferometric sensors

Patents and Techniques of Contact Pressure Measurement in Geotechnical Engineering

Detection of member overall buckling in civil space grid structures based on deviation in normal strain along the member

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