Operational Modal Analysis of a Historic GRP Structure

Wynne, Zachariah; Stratford, Tim; Reynolds, Thomas

doi:10.1007/978-3-030-74258-4_3

Cited by 2 publications

(4 citation statements)

References 4 publications

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“…This technique allows the modal parameters of civil structures to be estimated using ambient vibration measurements over short time intervals, allowing changes in dynamic parameters to be tracked over time. By tracking changes in the dynamic parameters, the impact of time-variant modal behaviour can be quantified, allowing for a more accurate assessment of serviceability performance and diagnosis of the causes of differences in behaviour between the design and the structure [36][37][38].…”

Section: Methods Of Modal Analysismentioning

confidence: 99%

“…The majority of OMA methods assume that the dynamic response of the system to a known input is constant over time, neglecting the impact that time-variant modal behaviour may have on estimates of dynamic parameters. To overcome the shortcomings of existing OMA techniques, the short-time random decrement technique (ST-RDT), a time-domain OMA method, has been developed by the authors [36][37][38]. The ST-RDT is an expansion on the random decrement technique [44], and allows variations in a structure's dynamic properties to be tracked over time by dividing the measured acceleration of a structure into short windows of data.…”

Section: Operational Modal Analysis Of the Bridgementioning

confidence: 99%

See 1 more Smart Citation

Dynamic testing and analysis of the world's first metal 3D printed bridge

Wynne

Buchanan²,

Kyvelou³

et al. 2022

Case Studies in Construction Materials

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Section: Methods Of Modal Analysismentioning

confidence: 99%

Section: Operational Modal Analysis Of the Bridgementioning

confidence: 99%

Dynamic testing and analysis of the world's first metal 3D printed bridge

Wynne

Buchanan²,

Kyvelou³

et al. 2022

Case Studies in Construction Materials

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“…Preliminarily, the model and its mechanical properties were calibrated to minimize the errors between the values of the numerical and experimental frequencies: (1) the obtained material properties, adopted to evaluate the reduced lamina stiffness (Equations (6)–(8)), are reported in Table 8 ; (2) the cable Young’s modulus was assumed to be equal to

for the Parafil Type G (Kevlar 49 core fibers) material [ 32 , 33 ].…”

Section: Resultsmentioning

confidence: 99%

“…The deck ( Figure 2 a) and pylons ( Figure 2 b) were realized [ 28 ] using cellular elements (

), which were preliminarily jointed through toggle and dog bone connections that are bonded with epoxy adhesive. The Parafil [ 32 , 33 ] stay cables, which connect the pylons with the deck through an aluminum spike [ 34 ] anchorage, consist of dry aramid and are compacted in polymeric sheets.…”

Section: Aberfeldy Footbridgementioning

confidence: 99%

Vibration Serviceability of the Aberfeldy Footbridge under Various Human-Induced Loadings

2023

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Developing new structural materials, such as composite materials, has provided many opportunities in bridge engineering. Among these materials, glass-fiber-reinforced polymers (GFRPs), in particular, have found applications in footbridges. However, some of the commonly recognized advantages of GFRPs, such as the high values of the strength/weight ratio, can also be considered disadvantageous for certain realizations, particularly when the composite material used in a footbridge is, for example, subjected to dynamic actions such as those that are induced by wind and walking and/or running users. The induced accelerations can reach high values in comparison to recommended thresholds. Further, the natural frequency decays during the service life, reducing the capacity of the frequencies to move toward the frequency content of the pedestrian step. In this framework, the presented research is devoted to the dynamic comfort assessment of a pioneering cable-stayed GFRP pedestrian bridge, Aberfeldy, which was assembled in 1992 in the eponymous small town, which is located in Scotland (UK). The assessment was numerically performed through a finite element (FE) model, which was tuned based on the literature data concerning geometry, structural details, and in situ-acquired frequencies. The analyses carried out in this study include the evaluation of the accelerations’ time histories, which were induced when simulating a set of pedestrian path scenarios, and the dynamic actions that occur during pedestrian traveling. Specifically, different values of velocity and step frequency were considered as well as the inclusion of walking and running movements. Then, based on the acceleration values, the assessments of comfort criteria for the current standards were elaborated while also recognizing that the peak accelerations—usually attained for short periods—cannot be the only parameters considered in evaluating the pedestrian bridge capacity. This investigation allowed a dynamic comfort rating to be established for the Aberfeldy footbridge.

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Operational Modal Analysis of a Historic GRP Structure

Cited by 2 publications

References 4 publications

Dynamic testing and analysis of the world's first metal 3D printed bridge

Dynamic testing and analysis of the world's first metal 3D printed bridge

Vibration Serviceability of the Aberfeldy Footbridge under Various Human-Induced Loadings

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