Benchmark Problem for Assessing Effects of Human-Structure Interaction in Footbridges

Gómez, Santiago Muñiz; Marulanda, Johannio; Thomson, Peter; García, José Jaime; Gómez, Daniel; Ortíz, Albert R.; Dyke, Shirley J.; Caicedo, Juan M.; Rietdyk, Shirley

doi:10.1007/978-3-319-54777-0_26

Cited by 3 publications

(4 citation statements)

References 7 publications

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“…This, in turn, enables analysis of the level of synchronization that constitutes a normative parameter in the vibration serviceability assessment. In most cases, however, only the total number of pedestrians is reported (Fanning et al 2010;Caetano et al 2010;Carroll et al 2013), for example, in tests involving free or metronome-guided walking (Brownjohn and Middleton 2005;Gheitasi et al 2016;Dey et al 2016;Van Nimmen et al 2016), or an estimate is made of the mean pacing rate by analyzing video footage (Dallard et al 2001;Živanović2012;Gomez et al 2017).…”

Section: Introductionmentioning

confidence: 99%

“…The more structural modes are excited, the more information can be derived from the source of the vibrations (Maes et al 2015). In many cases reported in the literature, the structural response is dominated by the contribution of one or two modes (Živanović2012; Dey et al 2016;Gomez et al 2017).…”

Section: Introductionmentioning

confidence: 99%

“…• Not many datasets are publicly available. To the knowledge of the authors, only the datasets collected by Živanović(2012) and Gomez et al (2017) are publicly available. In this paper, a novel publicly available full-scale dataset is introduced, documenting a comprehensive experimental study involving pedestrian-induced vibrations on the Eeklo footbridge.…”

Section: Introductionmentioning

confidence: 99%

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Eeklo Footbridge: Benchmark Dataset on Pedestrian-Induced Vibrations

2021

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Vibration serviceability under crowd-induced loading has become a key design criterion for footbridges. Although increased research efforts are put into the characterization of crowd-induced loading, including related interaction phenomena, and first-generation design guides are available, a major challenge lies in the further development and validation of prediction models for crowd-induced vibrations. Full-scale benchmark datasets that simultaneously register structural and crowd motion make an invaluable contribution to meeting this need by providing detailed information on representative operational loading and response data. Currently available datasets either (1) involve a (too) small number of pedestrians or (2) do not involve the simultaneous registration of pedestrian and bridge motion, or else they involve a footbridge (3) where only a single mode or a very limited number of modes are sensitive to walking excitation, (4) for which no suitable digital twin is available, or (5) that is not open access. This paper therefore presents a new and publicly available full-scale dataset collected specifically for the further development and validation of models for crowd-induced loading. The dataset is collected for a real footbridge, with a number of modes that are sensitive to pedestrian-induced vibrations, and with a digital twin available. The pedestrian and bridge motions are registered simultaneously using wireless triaxial accelerometers and video cameras. In addition to two data blocks involving purely ambient excitation, four data blocks are collected for two pedestrian densities, 0.25 and 0.50 persons/m 2 , representing a total of more than 1 h of data for each pedestrian density. Analysis of the structural response shows that the different data blocks can be considered representative for the involved load case. The identified distribution of step frequencies in the crowd indicates a significant contribution of (near-)resonant loading for a number of modes of the footbridge. Furthermore, the dataset displays clear signs of human-structure interaction, suggesting a significant increase in effective modal damping ratios due to the presence of the crowd.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Eeklo Footbridge: Benchmark Dataset on Pedestrian-Induced Vibrations

2021

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“…Collected data concern both the dynamic response measured under operating traffic conditions and statistics of the pedestrians' speed and frequency, as well as the footbridge mode shape. The second dataset is the one collected by Gomez et al [10] on a 12 m-long laboratory footbridge, specifically built as a testbed to study human-structure interaction. The footbridge dynamic response was recorded during one people crossing: 100 people crossed the footbridge 20 times each at frequencies controlled through a metronome.…”

Section: Introductionmentioning

confidence: 99%

Finite Element Models of a Benchmark Footbridge

et al. 2021

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Modern footbridges are often lively structures, characterized by natural frequencies that fall in the range of pedestrian activities, such as walking, running, and jumping. Therefore, serviceability assessment under human-induced excitation is crucial both at the design stage and during the footbridge lifetime. This paper presents and validates two different FE models of an existing footbridge with very complex geometry: the Streicker Footbridge at the Princeton University Campus. It represents a benchmark in the field as a testbed for vibration serviceability assessments under pedestrian excitation. The real structure is equipped with strain and temperature sensors that are currently used to collect measurements in both static and dynamic modes for research and educational purposes in Structural Health Monitoring (SHM). Based on detailed drawings of the Streicker Footbridge, a three-dimensional beam-based model was developed to represent the complex behavior of the full-scale benchmark bridge. Subsequently, a more refined discretization of the bridge deck adopting shell elements was inserted. The bridge Finite Element models were validated against available SHM data concerning static and dynamic tests. The relevant ANSYS APDL script files along with an example of pedestrian jumping application are available upon request for further research developments on the relationship between pedestrians and the benchmark footbridge.

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