Long term vibration monitoring of an RC slab: Temperature and humidity effect

Xia, Yong; Hao, Hong; Zanardo, Giovanna; Deeks, Andrew

doi:10.1016/j.engstruct.2005.09.001

Cited by 282 publications

(210 citation statements)

References 9 publications

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“…Another benefit of this method lies in that the environmental effect on the assessment is minimized, which is a key issue in the usual condition assessment or damage detection (Farrar et al 1997;Xia et al 2006 ). This is because the data of the slab and the girders are measured under the similar environmental conditions.…”

Section: Conclusion and Discussionmentioning

confidence: 99%

Condition Assessment of Shear Connectors in Slab-Girder Bridges via Vibration Measurements

et al. 2008

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The paper presents a field study on condition assessment of the shear connectors in a full slab-girder bridge via vibration measurements. Firstly, a model updating technique is employed to assess the condition of the whole structure including boundary conditions, bearings, girders, slab and shear connectors from the accelerations on the slab measured in vibration testing. Then, a new damage index based on the difference of frequency response functions on the slab and the corresponding points on the girder is developed to evaluate the condition of shear connectors. The advantage of the new method lies in the fact that it does not need any reference data (undamaged data) for the structure. Compared with the results obtained using the model updating technique, the method is more reliable and accurate in assessing the condition of the shear connectors between the slab and girders. The effect of measurement noise on the damage identification results and the damage quantification are also studied through numerical simulation.

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Section: Conclusion and Discussionmentioning

confidence: 99%

Condition Assessment of Shear Connectors in Slab-Girder Bridges via Vibration Measurements

et al. 2008

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“…Changes in frequency due to temperature can often be mistaken for structural damage [80,81] and, in some cases, can also mask true damage events, as Farrar et al [82] discovered when investigating a bridge girder subjected to incrementally induced damage events. The expectations of the assessment were that the inflicted damage would reduce the girder's stiffness and thus reduce its natural frequencies.…”

Section: Problematic Effects Of Environmental and Operational Conditionsmentioning

confidence: 99%

A State of the Art Review of Modal-Based Damage Detection in Bridges: Development, Challenges, and Solutions

2017

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Abstract:Traditionally, damage identification techniques in bridges have focused on monitoring changes to modal-based Damage Sensitive Features (DSFs) due to their direct relationship with structural stiffness and their spatial information content. However, their progression to real-world applications has not been without its challenges and shortcomings, mainly stemming from: (1) environmental and operational variations; (2) inefficient utilization of machine learning algorithms for damage detection; and (3) a general over-reliance on modal-based DSFs alone. The present paper provides an in-depth review of the development of modal-based DSFs and a synopsis of the challenges they face. The paper then sets out to addresses the highlighted challenges in terms of published advancements and alternatives from recent literature.

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“…Effects from snow and wind are not considered in this paper, and to the author's knowledge they are not frequently dealt with in literature. Thus, the focus here was on the temperature effects, as this is the most common source of confusion in any vibration health monitoring algorithm [29][30][31][32]. A previous study [15], investigated by simulations the effects from the environmental temperature changes on the natural frequencies of tensegrity structures, and concluded that these can be greater than the effects caused by slacking in one of the cables.…”

Section: Consideration Of Environmental Effectsmentioning

confidence: 99%

Vibration health monitoring for tensegrity structures

Ashwear

Eriksson

2017

Mechanical Systems and Signal Processing

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Tensegrities are assembly structures, getting their equilibrium from the integrity between tension in cables and compression in bars. During their service life, slacking in their cables and nearness to buckling in their bars need to be monitored to avoid a sudden collapse. This paper discusses how to design the tensegrities to make them feasible for vibrational health monitoring methods. Four topics are discussed; suitable finite elements formulation, pre-measurements analysis to find the locations of excitation and sensors for the interesting modes, the effects from some environmental conditions, and the pre-understanding of the effects from different slacking scenarios.

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Long term vibration monitoring of an RC slab: Temperature and humidity effect

Cited by 282 publications

References 9 publications

Condition Assessment of Shear Connectors in Slab-Girder Bridges via Vibration Measurements

Condition Assessment of Shear Connectors in Slab-Girder Bridges via Vibration Measurements

A State of the Art Review of Modal-Based Damage Detection in Bridges: Development, Challenges, and Solutions

Vibration health monitoring for tensegrity structures

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