Smart Sensing Technologies for Structural Health Monitoring of Civil Engineering Structures

Sun, Ming; Staszewski, Wiesław J.; Swamy, R.N.

doi:10.1155/2010/724962

Cited by 113 publications

(70 citation statements)

References 85 publications

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“…Nowadays, FBG sensors have attracted much interest and they are being used in numerous applications, especially in tunnel construction monitoring and bridge health assessment [19,2 Journal of Sensors 20]. Sun et al [21] believed that smart sensing technologies are now currently available and reviewed the application of smart materials/sensors for the SHM of civil engineering structures. Ye et al [22,23] presented a summary of the basic principles of various optical fiber sensors, innovation in sensing, and computational methodologies.…”

Section: Introductionmentioning

confidence: 99%

Fiber Bragg Grating Sensors-Based In Situ Monitoring and Safety Assessment of Loess Tunnel

et al. 2016

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Compared with electrical strain gauges, fiber Bragg grating (FBG) sensing technology is a relatively novel method for tunnel structural health monitoring, which has a number of advantages including high accuracy, multiplexing, electromagnetic interference resistance, and good repeatability. In order to study the internal force of the tunnel liner and detect the potential safety hazards, series of strain monitoring tests of a loess tunnel, taking into account the complex stress and strain variation of the loess during tunnelling, were performed by employing the tandem linear FBG sensor arrays controlled by the wavelength division multiplexing (WDM) technology. The concrete strain has obvious linear characteristics over time in the early stage and then gradually tends to a stable value. Moreover, after the necessary temperature compensation, loess tunnel structure safety was assessed through the analysis of real-time strain and internal force of the liner concrete, and the FBG monitoring data and safety assessment results indicate that the safety factors of various liner sections all meet the code requirements, which verify the safety and stability of the tunnel liner structure. The FBG sensors-based in situ monitoring technology can be well applied in the loess tunnel structure safety assessment.

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Section: Introductionmentioning

confidence: 99%

Fiber Bragg Grating Sensors-Based In Situ Monitoring and Safety Assessment of Loess Tunnel

et al. 2016

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“…However, the strain gauge sensors used cannot monitor these types of damages in real time. During recent years, emphasis has been placed on structural health monitoring (SHM) [47,48] in civil engineering [49][50][51]]. An SHM system has the ability to monitor the health status of a structure in real time based on integrated sensors and to issue early warnings based on advanced algorithms to prevent catastrophic consequences [52][53][54].…”

Section: Discussion On Real-time Damage Monitoringmentioning

confidence: 99%

Damage Analyses of Replaceable Links in Eccentrically Braced Frame (EBF) Subject to Cyclic Loading

2019

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In the current design of steel eccentrically braced frames (EBFs), the yielding link is coupled with the floor beam. This causes the design of cross-sectional dimensions of links to be enlarged, resulting in over-designed structures and foundations, and increasing the cost of the overall structure. In addition, the beams are forecast to sustain severe damage through repeated inelastic deformations under design-level earthquakes, and thus the structure may require extensive repair or need to be replaced. To improve upon these drawbacks, a shear device with replaceable links based on EBFs was designed. The hysteresis curve, the stress distribution, and the deformation of the specimen were obtained by cyclic loading tests of the eight replaceable links. The energy dissipation behavior, the bearing capacity, the failure modes, and the plastic rotation angle of those specimens were analyzed. The results indicated clearly that the links in this shear device had inelastic deformation concentrated in the link showing very stable hysteresis behavior, and damaged links were replaced easily as end-plate connections were adopted. The energy dissipation capacity and the plastic rotation angle of the specimens were mainly dependent on the arrangement of stiffener, length ratio, and welding access holes. Experimental studies performed in this research and the related damage analyses reveal that cracks are the major causes of damage to the EBF and there is a lack of research on real-time monitoring of the onset and development of these cracks in EBF structures. As a future work, this paper proposes a piezoceramic patch transducer-based active sensing approach to monitor the crack onset and development of the EBF when subjected to dynamic loadings.

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“…Generally, the strain changes abruptly in these structures due to damages. Structures such as mechanical blades, shafts, aero-wings, and civil structures have to be monitored for strain variations due to cracks and damages [1][2][3][4]. Different smart materials are being used to monitor the health of structures.…”

Section: Introductionmentioning

confidence: 99%

Crack monitoring using multiple smart materials; fiber-optic sensors & piezo sensors

Maheshwari

Annamdas

Pang

et al. 2017

International Journal of Smart and Nano Materials

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This article focuses on health monitoring of structures using multiple smart materials. In this research, two fiber-optic sensors, namely fiber Bragg grating (FBG) and fiber-optic polarimetric sensor (FOPS), are investigated for damage detection in the beam specimen. FBG is used for local strain measurement while FOPS is used for global strain measurement. Both FBG and FOPS show significant changes in the strain due to damages in the specimen. Also, at the center of the specimen, piezoelectric wafer active sensor (PWAS) is attached. The electromechanical admittance (EMA) signature of the specimen beam is recorded by PWAS. The changes in the amplitudes of the peaks obtained at various frequencies in this EMA signature are analyzed, and it is shown that the peak amplitudes respond differently to damages and to change in loading. Thus, multiple smart materials (FBG, FOPS, and PWAS) are used to get improved information on the health of the beam. KEYWORDSFiber-optic polarimetric sensor (FOPS); fiber Bragg grating (FBG); piezoelectric wafer active sensor (PWAS); crack/damage monitoring

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Smart Sensing Technologies for Structural Health Monitoring of Civil Engineering Structures

Cited by 113 publications

References 85 publications

Fiber Bragg Grating Sensors-Based In Situ Monitoring and Safety Assessment of Loess Tunnel

Fiber Bragg Grating Sensors-Based In Situ Monitoring and Safety Assessment of Loess Tunnel

Damage Analyses of Replaceable Links in Eccentrically Braced Frame (EBF) Subject to Cyclic Loading

Crack monitoring using multiple smart materials; fiber-optic sensors & piezo sensors

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